GA 03.108/14.02 Ws Wsu

User Manual: ws-wsu

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RUVAC WS/WSU

251/501/1001/2001

Roots pump with mineral oil,

synthetic oil or PFPE filling

Cat.-No.

101 83

117 22/32/42/52

117 23/33/43/53

117 27/37/47/57

117 28/38

118 33/43/53

150 44/95/96

167 007

917 48

155 000

Operating Instructions

GA 03.108/14.02

Vacuum Solutions Application Support Service LEYBOLD VACUUM

View our inventory

Contents

Contents Page

IMPORTANT SAFETY CONSIDERATIONS . .4

1 Description . . . . . . . . . . . . . . . . . . . . . . . . . .6

1.1 Design and function . . . . . . . . . . . . . . . . . . . .6

1.2 Standard specification . . . . . . . . . . . . . . . . . .9

1.3 Technical data . . . . . . . . . . . . . . . . . . . . . . .10

1.4 Accessories . . . . . . . . . . . . . . . . . . . . . . . . .11

2 Transportation and storage . . . . . . . . . . . .12

3 Installation and connection . . . . . . . . . . . .13

3.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.2 Filling in of the lubricants . . . . . . . . . . . . . . .13

3.3 Electrical connections . . . . . . . . . . . . . . . . . .14

3.4 Connection of the flanges . . . . . . . . . . . . . . .16

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.1 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.3 Shutdown and storage . . . . . . . . . . . . . . . . .18

4.4 Changing from vertical to horizontal flow . . . .18

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . .19

5.1 Safety information . . . . . . . . . . . . . . . . . . . . .19

5.2 Exchanging the lubricants . . . . . . . . . . . . . . .19

5.3 Cleaning the fan cowl and the cooling fins . .20

5.4 Cleaning the dirt trap . . . . . . . . . . . . . . . . . .20

5.5 Cleaning the pumping chamber . . . . . . . . . .21

5.6 Cleaning the valve of the pressure

balance line . . . . . . . . . . . . . . . . . . . . . . . . .21

5.7 Leybold service . . . . . . . . . . . . . . . . . . . . . .22

6 Troubleshooting . . . . . . . . . . . . . . . . . . . . .23

EEC Declaration of Conformity . . . . . . . . .24

Indicates procedures that must be strictly

observed to prevent hazards to persons.

Indicates procedures that must strictly be

observed to prevent damage to, or destruc-

tion of the equipment.

Figures

The references to figures, e.g. (1/2) consist of the Fig.

No. and the Item No. in that order.

2GA 03.108/14.02 - 01/03

Warning

Caution

Contents

Leybold-Service

If a pump is returned to Leybold, indicate whether the

pump free of substances damaging to health or whether

it is contaminated.

If it is contaminated also indicate the nature of the

hazard. Leybold must return any pumps without a

„Declaration of Contamination“ to the sender’s address.

Disposal of waste oil

Under the amended law relating to waste disposal dated

November 1, 1986 (valid in the Federal Republic of Ger-

many) the disposal of used oil is subject to new provi-

sions. According to legislation relating to waste disposal

the so-called principle of causality is applied. Hence,

anyone in possession of used oil is responsible for its

proper disposal.

Used oils coming from vacuum pumps must not be

mixed with other substances.

Used oils from vacuum pumps (LH-oils on the basis of

mineral oils) having been affected by normal contamina-

tion due to oxygen from the ambient air, increases in

temperature and mechanical wear, must be disposed of

as used oil in accordance with the regulations.

Used oils from vacuum pumps that have been contami-

nated by other substances must be labelled, stored and

disposed of as special waste with reference to the kind

of contamination.

If you send a pump to LEYBOLD for repair please indi-

cate any harmful substances existing in the pump oil or

around the pump.

When disposing of used oil please observe the safety

regulations that are valid in your country.

We reserve the right to modify the design and the speci-

fied data. The illustrations are not binding.

GA 03.108/14.02 - 01/03

4GA 03.108/14.02 - 01/03

Safety considerations

IMPORTANT SAFETY CONSIDERATIONS

The Leybold RUVAC vacuum pump is designed for safe and efficient operation when used properly and

in accordance with this manual. It is the responsibility of the user to carefully read and strictly observe

all safety precautions described in this section and throughout the manual. This product must be ope-

rated and maintained by trained personnel only. Consult local, state, and national agencies regarding

specific requirements and regulations. Address any further safety, operation and/or maintenance que-

stions to your nearest Leybold Vacuum office.

Warning Failure to observe the following precautions could result in serious personal injury.

• Before beginning with any maintenance or service work on the RUVAC, disconnect

the pump from all power supplies.

• Do not operate the pump with any of the covers removed. Serious injury may result.

• If exhaust gases must be collected or contained, do not allow the exhaust line to

become pressurized.

• Make sure that the gas flow from the exhaust port is not blocked or restricted in

any way.

• The standard version of the RUVAC is not suited for operation in explosion hazard

areas. Contact us before planning to use the pump under such circumstances.

• Before starting up for the first time, the motor circuit must be equipped with a suitable

protective motor switch. Please take note of the information in these Operating

Instructions or on the electric motor (wiring diagram).

• The RUVAC is not suited for pumping of

- combustible and explosive gases or vapours

- radioactive and toxic substances

- pyrophorous substances.

• The RUVAC must be integrated in the system control arrangement so that the pump

can not run-up automatically after it has been shut down by the temperature switches

in the motor. This applies equally to emergency shut-down arrangements. After having

determined the fault cause, the pump should be switched on manually again.

• Avoid exposing any part of the human body to the vacuum.

• Never operate the RUVAC without a connected intake line or blank flange.

• The location at which the RUVAC (including its accessories) is operated should be

such that angles over 10° from the vertical are avoided.

• The location of the RUVAC should be such that all controls are easily accessible.

• Under certain ambient conditions the RUVAC may attain a temperature of over 80 °C

(176 °F). There then exists the danger of receiving burns.

Note the symbols on the pump pointing to the hazards, and in the case of a hot pump

wear the required protective clothing.

GA 03.108/14.02 - 01/03

Safety considerations

Warning • The noise level produced by the RUVAC is about 63 to 72 dB(A).

Make sure that suitable protection measures are taken to protect the hearing.

• Before pumping oxygen (or other highly reactive gases) at concentrations exceeding the

concentration in the atmosphere (> 21 % for oxygen) it will be necessary to use a special pump.

Such a pump will have to be modified and de-greased, and an inert special lubricant (like PFPE)

must be used.

• Before commissioning the RUVAC, make sure that the media which are to be pumped are

compatible with each other so as to avoid hazardous situations.

All relevant safety standards and regulations must be observed.

• It is recommended to always operate the RUVAC with a suitable exhaust line which is properly

connected.

• When moving the RUVAC always use the allowed means.

A lifting eye is provided as standard on the pump.

Caution Failure to observe the following precautions could result in damage to the pump:

• Do not allow the ingestion of small objects (screws, nuts, washers, pieces of wire, etc.)

through the inlet port. Always use the screen which is supplied with every pump.

• Do not use the pump for applications that produce abrasive or adhesive powders or

condensable vapors that can leave adhesive or high viscosity deposits. Please contact Leybold Sales

for selecting the right separator.

• Before pumping vapors, the RUVAC should have attained its operating temperature.

The pump will have attained its operating temperature about 30 minutes after starting the pump.

During this time the pump should be separated from the process, by a valve in the intake line,

for example.

• In the case of wet processes we recommend the installation of liquid separators upstream and

downstream of the pump so as to avoid a massive influx of liquid into the pump.

• The exhaust line should be laid so that it slopes down and away from the pump so as to prevent

condensate from backstreaming into the pump.

• In order to prevent the transfer of vibrations from the RUVAC to other parts of the system we

recommend the use of corrugated hoses or compensators on both the intake and the exhaust sides.

• The entry of particles and fluids must be avoided under all circumstances.

• Corrosion, deposits and cracking of oil within the pump are not allowed.

Description

6GA 03.108/14.02 - 01/03

1 Description

1.1 Design and Function

The RUVAC WS and RUVAC WSU are Roots pumps dri-

ven by a canned motor.

The WSU types have a pressure balance line between

the discharge and intake flanges.

The RUVAC WS and WSU are lubricated with mineral oil

or perfluorized polyether (PFPE) in the case of the PFPE

models. Apart from the lubricant the mineral oil and

PFPE models are identical in type.

Only the RUVAC WS/WSU PFPE can be used for pum-

ping greater than atmospheric concentrations of oxygen

or very aggressive or hazardous gases.

1.1.1 Principle of Operation

Roots pumps - also known as Roots blowers - contain in

their pump casing (1/3) two symmetrical impellers (1/4)

rotating in opposite directions. The impellers have roug-

hly the cross section of a figure „8“ and are synchronised

by a toothed gearing so that they move past each other

and the casing without contact but with a small clearan-

ce.

The principle of operation is explained in Fig. 2.

In impeller positions I and II, the volume in the intake

flange is increased. When the impellers rotate further to

position III, part of the volume is sealed off from the inta-

ke side.

In position IV, this volume is opened to the discharge

side, and gas at backing pressure (higher than the inta-

ke pressure) flows in. The inflowing gas compresses the

gas volume pumped from the intake side. As the impel-

lers rotate further, the compressed gas is ejected via the

discharge flange.

This process occurs twice per complete revolution of

each of the two impellers.

Due to the non-contacting rotation in the pumping cham-

ber, Roots pumps can be operated at high speeds (stan-

dard n = 3,000 rpm at a mains frequency of 50 Hz). Thus

a relatively high pumping speed is attained with small

pumps.

The pressure differential and compression ratio between

the intake and discharge sides are limited on Roots

pumps. If the allowable pressure differential is exceeded,

the pump overheats.

In practice, the maximum attainable pressure differential

is significant only in the rough vacuum range (p > 10

mbar), whereas for pressures in the fine vacuum range

(p < 1 mbar) the attainable compression ratio is decisive.

Fig. 2 Functional diagram of a Roots pump (vertical flow)

Key to Fig. 1

1 Intake flange

2 Pumping chamber

3 Casing

4 Impeller

5 Discharge flange

Fig. 1 Schematic cross-section of a Roots pump (vertical flow)

Description

GA 03.108/14.02 - 01/03

RUVAC pumps from the WS/WSU range have been spe-

cifically designed for operation in the rough and fine

vacuum ranges. They are thus either used in connection

with backing pumps or in closed gas cycles. The pump’s

power consumption depends not only on the pumping

chamber volume and the rotational speed of the pump,

but also on the pressure differential between the dischar-

ge and intake flanges (see Fig. 7).

1.1.2 Design

RUVAC Roots pumps can pump gas in the vertical or

horizontal direction.

Although the pumping chamber of Roots pumps is free

of sealing agents and lubricants, the two gearwheels of

the synchromesh gearing (3/1) and the bearings (3/2)

are lubricated with mineral oil or with PFPE. The gear-

wheels and bearings of the RUVAC are located in two

side chambers which also contain the oil supply.

These two side chambers are separated from the pum-

ping chamber by the impeller seals (3/3). During operati-

on of the pump, the side chambers are evacuated via the

impeller seals.

The side chambers are linked to each other by two pas-

sages (3/12). These passages are arranged so that for

either horizontal or vertical flow the pressure will be

equalised between the oil supplies.

In both side chambers there are integrated oil pumps to

ensure that the bearings and gearwheels receive suffi-

cient lubricant at all recommended speeds.

RUVAC WS/WSUs are driven by a canned motor. In such

a motor, the rotor and stator coils (3/6) are separated by

a vacuum-tight can (3/7) made of non-magnetic materi-

al. The rotor runs in the vacuum on the pump’s drive

shaft (3/10); thus a shaft feedthrough to the atmosphere

is not needed.

With the standard motors, the RUVAC WS/WSUs can

run on either 50 Hz or 60 Hz power supplies.

For the permissible electrical connection data with res-

pect to these frequencies, see Section 1.3.

Fig. 3 Longitudinal section of a RUVAC WS 1001 (horizontal flow)

Key to Fig. 3

1 Gearwheels 8 Fan cowl

2 Bearings 9 Fan

3 Impeller seals 10 Drive shaft

4 Impellers 11 Centrifugal disc lubricator

5 Driven impeller shaft 12 Equalisation passage

6 Stator 13 Intake port

7 Can 14 Centrifugal disc lubricator

Description

8GA 03.108/14.02 - 01/03

Incorporated in the motor’s stator winding is a thermal

switch which turns off the pump when the motor tempe-

rature is too high.

RUVAC WS/WSUs are air-cooled. The airflow for cooling

the motor and pump is produced by a fan (3/9) with its

own drive motor under the motor’s fan cowl (3/8).

When operating the pump via a frequency

converter you must ensure that the drive

motor for the fan is connected to the mains.

1.1.3 Pressure Balance Line

The RUVAC WSU has an integrated pressure balance

line (4/1). It links the discharge and intake flanges via a

pressure balance valve.

If the pressure differential between the flanges is too

large, the valve opens (4/2). Some of the gas which has

already been pumped then flows back through the line to

the intake flange.

The valve is weight- and spring-loaded so that it works

with both vertical and horizontal flow of the pump.

As a result of this pressure balance line, no additional

devices are needed to protect the pump against exces-

sive pressure differentials.The RUVAC WSU can be swit-

ched on at atmospheric pressure at the same time as a

backing pump. As a result, the pumping speed of the

pump combination is increased even at high intake pres-

sures.

1.1.4 Lubricants

RUVAC WS/WSU pumps are, as standard, prepared eit-

her for operation with mineral oil, synthetic oil or the spe-

cial lubricant perfluoropolyether PFPE).

Other types of oil (white oil, for example) upon request.

If mineral oil and PFPE come into contact

they will emulsify. That’s why the pumps

must only be run with the type of lubricant

specified for the pump. If you want to chan-

ge the type of lubricant LEYBOLD should

do the change.

In case of operation with mineral oil we recommend our

vacuum pump oil N 62 (HE-200 in the USA). In case of

operation with PFPE we recommend our NC 1/14

(HE1600 in the USA).

PFPE pumps are marked by an additional red label at

the oil-fill screw.

The Operating Instructions GA 07.009 „PFPE for Vacu-

um Pumps“ will be enclosed with any RUVAC PFPE.

Observe the handling notes for PFPE collected in these

Operating Instructions.

1.1.5 Flange Connections

The cast flanges on the pump’s body comply with DIN

2501, nominal pressure 6.

The pumps are supplied with different collar flanges:

Pumps with Cat. Nos. beginning with 117... are equipped

with ISO-K collar flanges. This standard can be applied

in all other parts of the world.

Fig. 4 Schematic diagram of a Roots pump with pressure balance line

Caution

Key to Fig. 4

1 Pressure balance line

2 Pressure balance valve

Caution

Description

GA 03.108/14.02 - 01/03

1.2 Standard Specification

RUVAC WS/WSUs are supplied for vertical flow as stan-

dard unless you specifically request horizontal flow.

Before delivery the oil has been drained out. The

quantity of mineral oil, synthetic oil or PFPE oil required

for operation has been included separately.

Pumps with Cat. Nos. beginning with 117... are supplied

with a sealing disc, a blank flange and an ISO-K collar

flange fitted with the required number of screws.

The intake flanges of all pumps contain a wire mesh dirt

trap and have been vented with nitrogen for protection

against corrosion.

Fig. 5 Dimensional drawing for the RUVAC WS/WSU

DN 1

h51)

DN1

b1b

a5a2a1a

DIN 2501 DN

WS/WSU 251 65 63 ISO-K

WS/WSU 501 65 63 ISO-K

WS/WSU 501H 65 63 ISO-K

WS/WSU 1001 100 100 ISO-K

WS/WSU 1001H 100 100 ISO-K

WS/WSU 2001 150 160 ISO-K

WS/WSU 2001H 150 160 ISO-K

RUVAC WSU only DN

= ND 6 pump flange in accordance with DIN 2501

= Collar flange with gasket for connecting ISO-K standard components

697 405 365 14 212 120 250 270 210 280 230 170

745 486 450 14 239 155 307 299 229 320 271 201

887 560 520 16,5 300 180 372 352 278 370 320 246

1065 800 740 18 370 220 457 518 388 460 422 292

71)

51)

24 305 285 300 160 280 180 306 360 307

24 390 313 340 180 320 194 348 430 332

24 414 330 340 180 320 194 348 450 350

24 490 366 396 211 370 227 414 532 392

24 524 398 396 211 370 227 414 564 424

24 635 456 530 300 460 351 578 753 523

24 642 460 530 300 460 351 578 760 530

Fig. 6 Pumping speed characteristics for operation at 50 Hz

The ultimate pressure (Pult.) depends on the backing

pump used. Fig. 7 Power consumption of the RUVAC WS/WSU

Saugvermögen

Druck

Description

10 GA 03.108/14.02 - 01/03

1.3 Technical Data

(SI units)

RUVAC WS / WSU 251 501 1001 2001

Nominal pumping speed 1) m3· h-1 253 505 1000 2050

Maximum pumping speed (at a pumping

speed for the backing pump of) m3· h-1

m3· h-1 210

65 450

160 890

250 1850

630

Possible cut-in pressure (RUVAC WS at a

pumping speed for the backing pump of) mbar

m3· h-1

65 37

160 27

250 22

630

Leak tightness mbar · l ·s-1 1 · 10-4

Permissible ambient temperatures

(Mineral oil and PFPE) °C12 - 40 °C

Permissible voltages at the motor’s fan AC 230 V / 50/60 Hz and 265 V / 60 Hz

Maximum allowable pressure differential in

continuous operation mbar 80 80 80 50

Mains voltage at the motor, 50 Hz V200 V (-5 %) - 230 V (+10 %) / 400 V (±10 %)4)

Motor power, 50 Hz kW 1,1 2,2 4,0 7,5

Nominal speed, 50 Hz min-1 3000 3000 3000 3000

Max. permissible speed min-1 6000 6000 6000 42003)

Motor protection category IP 20 20 20 20

Lubricant filling6)

• PFPE - vertical flow

- horizontal flow

• other types of oil

- vertical flow

- horizontal flow

1.Filling5) / 2.Filling

0,6 0,55

0,5 0,45

0,65 0,6

0,5 0,45

1.Filling5) / 2.Filling

0,85 0,75

0,75 0,7

0,9 0,8

0,75 0,7

1.Filling5) / 2.Filling

1,95 1,75

1,2 1,1

2,0 1,8

1,2 1,1

1.Filling5) / 2.Filling

3,8 3,5

2,6 2,4

3,85 3,6

2,6 2,4

Weight WS / WSU kg 90 / 95 130 / 135 228 / 233 458 / 465

Collar flanges DN 63 ISO - K 63 ISO - K 100 ISO - K 160 ISO - K

Noise level 2) dB (A) < 63 < 63 < 68 < 72

Cat. Nos.

RUVAC WS 117 22 117 32 117 42 117 52

RUVAC WSU 117 23 117 33 117 43 117 53

RUVAC WS PFPE 117 27 117 37 117 47 117 57

RUVAC WSU PFPE 117 28 117 38 - -

1) as per DIN 28400 ff

2) at an operating pressure < 10-1 mbar at 1 meter distance

3) upon request also available with a speed of 6,000 rpm

4) at Kat.-Nr. 150 44 - 230/400 V ±10 %, 50/60 Hz

5) after a complete disassembly

6) authoritative, however, is the oil level at the oil-level glass, see Fig. 8 and 9

7) horizontal flow

8) Impeller, balanced

Mains voltage at the motor, 60 Hz V200 V (-5 %) - 265 V (+10 %) / 460 V (±10 %)4)

RUVAC WS ANDEROL 555 101 83 7) 150 44

155 0003)

RUVAC WSU (H)

with ACE vibration absorber -118 33 118 43 118 53

RUVAC WS 100 Hz 8) - - - 167 007

RUVAC WSU 100 Hz 8) - - - 150 96

RUVAC WS - PFPE 100 Hz 8) - - - 150 95

Description

GA 03.108/14.02 - 01/03

The motor overload protection switch must be set to the nominal current stated in the table in each case.

The separate fan current may only be operated within the permissible voltage range (230 V, 50 Hz and

265 V, 60 Hz) as otherwise the fan will be damaged, especially so when using a frequency converter.

In the case of deviating voltages you must use a transformer.

Caution

Pump model

WS 251

WSU 251

WS/WSU PFPE 251

WS 501

WSU 501

WS/WSU PFPE 501

WS 1001

WSU 1001

WS PFPE 1001

WS 2001

WSU 2001

WS PFPE 2001

200 V

KW A

0,9 4,8

1,6 7,8

313

521

230 V

KW A

1,1 5,5

2,2 9

4 15,7

7,5 26

400 V

KW A

1,1 3,2

2,2 5,4

4 9,1

7,5 15

200-208 V

KW A

0,9 4,8

1,6 7,8

313

521

265 V

KW A

1,4 5,5

2,4 10

4,4 14,7

8,5 26

460 V

KW A

1,4 3,2

2,4 5,8

4,4 8,5

8,5 15

Nominal power / Nominal current at

50 Hz

Nominal power / Nominal current at

60 Hz

Voltage ranges for the canned motors of the RUVAC WS/WSU pumps

1.4 Accessories

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cat.-No.

Set of gaskets

WS/WSU 251 . . . . . . . . . . . . . . . . . . . . . . . . . .194 62

WS/WSU 501 . . . . . . . . . . . . . . . . . . . . . . . . . .194 66

WS/WSU 1001 . . . . . . . . . . . . . . . . . . . . . . . . .194 70

WS/WSU 2001 . . . . . . . . . . . . . . . . . . . . . . . . .194 74

Oil pressure switches . . . . . . . . . . . . . . . . . . .194 82

(for WS-PFPE models only)

Oil drain facility (M 16 x 1.5)

- with right-angled drain coupling . . . . . . . .200 14 271

ACE vibration absorber

WAU/WSU 501 . . . . . . . . . . . . . . . . . . . . .200 03 251

WAU/WSU 1001 . . . . . . . . . . . . . . . . . . . .200 03 252

WAU/WSU 2001 . . . . . . . . . . . . . . . . . . . . . . . .100 22

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cat.-No.

Pressure switch PS 115 (stainless steel) . . . .160 04

Accessories for mounting PS 115

Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168 40

Right-angle bend DN 16 KF . . . . . . . . . . . . . . .184 36

Centering ring DN 16 KF, 2 x . . . . . . . . . . . . . .183 26

Clamping ring DN 16 KF, 2x . . . . . . . . . . . . . . .183 41

Contact amplifier SV 110

- 220 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .160 78

Oil N 62*,5l . . . . . . . . . . . . . . . . . . . . . . . . . . . .177 02

Oil HE-200*,1 gal . . . . . . . . . . . . . . . . . . .98-198-007

PFPE NC 1/14,1l . . . . . . . . . . . . . . . . . . . . . . .177 38

PFPE HE-1600,2 lb . . . . . . . . . . . . . . . . . . .898 564-1

Oil ANDEROL 555,1l . . . . . . . . . . . . . . . . .200 10 272

* N 62 is an oil grade of LH Cologne, and HE-200 is an oil grade of LHVP Export. They are interchangeable. For other

quantities, see catalogue. This applies similarly also to NC 1/14 and HE-1600.

Only fill in the oil

after

having installed the

pump.

In the case of the RUVAC WS PFPE also observe the

additional information provided in Operating Instructions

GA 07.009.

3.1 Installation

Install RUVAC WS/WSU pumps on a flat, horizontal sur-

face (5° max. tilt).

If the pump is not level, lubricant may enter the pumping

chamber from the gear chambers.

Keep the air intake and exhaust ducts for cooling the

motor unobstructed (for minimum clearance with respect

to the fan cowl, see Fig. 5).

The pump’s ambient temperature should be between

12 °C and 40 °C . Lower temperatures hamper run-up;

higher ones shorten the lubricant change intervals and

may lead to greater wear.

Special oil for operation at temperatures below 12 °C is

available upon request.

Install the WS/WSU pumps only in rooms

with a roof. Motor and fan cowl are rated as

IP 20 and are thus not protected against

drip water and condensing water.

Secure the pump. Four bores in the feet are provided for

this purpose.

3 Installation and Connection

Caution

Transportation and storage

12 GA 03.108/14.02 - 01/03

Roots pumps are heavy machines (> 70 kg) made of

cast iron and thus should only be lifted using suitable lif-

ting equipment tied to the eye (8/3) provided for this pur-

pose.

Before transporting the pump always drain

out the oil (see Section 5.2). Screw the oil-

drain plug with its gasket back in and wipe

any oil droplets off from the casing.

The pump should be transported and sto-

red in a horizontal position (5° max. tilt with

respect to its longitudinal axis). Otherwise

there is the danger that oil from the side

chambers may enter the pump chamber,

even before the pump is filled with oil for the

first time.

When shelving the pump for a longer period

of time you should seal off the flanges of the

pump with a piece of foil or the cardboard

discs initially supplied with the pump using

the collars. Place a bag with desiccant in

the pump chamber, if required. Before ope-

rating the pump once more do not forget to

remove this bag first.

Pumps having a filling of PFPE should be

sealed off in a gas-tight manner and vented

with nitrogen.

The area of the motor (fan and slits at the

flange of the motor) must be protected

against dust and dripping water.

2 Transportation and Storage

Caution

When bolting the feet down, make certain

that there is no stress or twist on the pump

casing. Stress on the pump can change the

close tolerances between the impellers and

the pump casing and may result in damage

to the pump (use washers to equalise).

Since compensation elements must be

attached to the flanges on the suction and

pressure sides, the screws for attachment

of the feet must always be fitted and tighte-

ned.

Use the following screws:

RUVAC 251/501: 4 x M 12

RUVAC 1001/2001: 4 x M 16

Caution

Warning

Installation and connection

GA 03.108/14.02 - 01/03

When operating the pump with PFPE, the

correct oil level must be as shown in Fig. 8.

If the oil level is too low, the bearings and

gearwheels are not lubricated adequately; if

it is too high oil may enter the pumping

chamber.

Clean the oil-fill port and screw the plug

back in using a gasket which is in perfect

condition.

The oil-fill port must be sealed air-tight.

Entry of air from the outside may cause oil-

containing gas to enter the pumping cham-

ber via the impellers seals.

Caution

Fig. 9 Oil level in the oil glass

Pumping action of the vacuum pump

vertical horizontal

Approximate

oil level during

operation min.

max. min.

max.

Oil level with

the pump at

standstill

Fig. 8 Connections and controls; arrows = direction of flow

4 5 6 7 8

min.

max.

Oil level in the oil glass

- with PFPE

min.

max.

Pumping action of the vacuum pump

vertical horizontal

Oil level in the oil glass

- with N 62 and Anderol

Oil level with

the pump at

standstill

Oil level with

the pump at

standstill

3.2 Filling in of the Lubricants

The lubricant needed for running the pump is supplied in

a separate container.

Unscrew the oil-fill plug (11/3) and add lubricant.

An oil without additives and of viscosity class ISO VG

100 (formerly SAE 30) must be used for the pump. We

recommend the use of our special oils N 62, ANDEROL

555 or HE-200. As PFPE we recommend our NC 1/14 or

HE-1600. Please consult us if you intend to run the pump

with other oils or special lubricants.

With the pump at standstill, the correct oil level for a

pump with vertical pumping action is in the middle, in the

case of horizontal pumping action, 4 mm over the

middle of the oil level glass (8/2), see also Fig. 9.

Key to Fig. 8

1 Discharge flange

2 Oil-level glass

3Eye

4 Oil-fill port

5 Intake flange

6 Connection for pressure switch

7 Direction-of-rotation arrow

8 Pressure switch

9 Centering and clamping ring

10 Right-angle bend

11 Adapter

12 Junction box

Approximate

oil level during

operation

Oil level with

the pump at

standstill

Installation and connection

14 GA 03.108/14.02 - 01/03

3.3 Electrical Connections

Disconnect the mains before doing work on

the wiring.

The electrical connections must only be

provided by a trained electrician in accor-

dance with the regulations of the IEC 64

international series of standards.

For proper connection, a suitable motor pro-

tection switch must be used. Set the switch

in accordance with the rating on the motor

nameplate.

The pumps of the RUVAC WS/WSU series

may also be operated by a frequency con-

verter. For maximum speeds, refer to Sec-

tion 1.3.

Please note, that at increased speeds and

at the available maximum power, the max.

permissible pressure difference (see Sec-

tion 1.3) is no longer obtained.

Especially when operating the pump using

a frequency converter you must ensure by

means of a separate mains connection for

the fan’s motor that is connected to the right

supply voltage and frequency. Otherwise

the fan will be damaged.

Always provide an uninterrupted connection

for the protective ground conductor

connecting it in a professional manner.

Never leave the protective ground conduc-

tor for the pump unconnected.

Connect the pump to the correct mains vol-

tage through the terminals provided in the

junction box (see Fig. 10).

Do not link control circuits to the power cir-

cuit of the motor. Observe the wiring dia-

grams of Fig. 10.

When connecting the motor you must also

connect the thermal switch of the pump

motor and the fan motor (for recommenda-

tions, see Fig. 10).

Only the PG fittings provided on the junction

box may be used.

After connecting the motor and every time

you alter the wiring, check the direction of

rotation.

Never allow the pump to run in the wrong

direction or with open flanges for a longer

period of time.

An arrow (8/7) on the motor flange shows the correct

direction of rotation for the impeller connected to the

motor shaft. To check rotation, switch on the motor brief-

ly and observe the direction of impeller rotation through

the pump’s intake and then immediately switch off again.

Wear protective goggles for protection

against particles which may be forced out of

the flange opening. Keep your hands away

from the flange opening.

The impellers should move up from the center and drop

down to the side.

If this is not the case, disconnect the pump from the

mains and interchange two mains phases.

Even if the pump has been already firmly connected to

the piping, you may determine the direction of rotation.

For this, evacuate the vacuum system down to a pressu-

re below 20 mbar with the aid of the backing pump.Then

switch on the RUVAC briefly; now the pressure must

drop. If the pressure increases or remains constant, the

RUVAC is turning in the wrong direction.

Then rewire as described above.

The built-in fan is driven by a separate

single-phase motor and may thus not be

used to determine the direction of rotation

of the pump.

Its direction of rotation is independent of the

pump and doesn’t change when you inter-

change the phases.

Connecting the fan to the terminals for the

motor is not allowed.

The fan should be connected via a separa-

te cable to 230 V, 50/60 Hz or 265 V/60 Hz.

A voltage of 265 V/60 Hz must not be

exceeded. In a case of deviating voltages

an appropriate transformer must be used.

In no single phase 230 V/50 Hz or 265 V/60 Hz mains

power is available, the motor of the fan may be connec-

ted between two live conductors. A wiring diagram is pro-

vided in the junction box of the motor.

The RUVAC can be automatically switched on and off via

a contactor using a pressure switch and the contact

amplifier SV 110 (see Section 1.4).

Warning

Caution

Warning

Caution

Warning

Caution

Installation and connection

GA 03.108/14.02 - 01/03

Fig. 10 Electrical connection

Key to Fig. 10

B1 Pressure switch PS 115

B2 Limit switch, coil temperature

B3 Flow monitor (fan)

K1 Relay for fan motor

K2 Relay for temperature monitor, pump’s motor

K3 Relay for Roots pump motor

K4 Relay for fan monitor

N1 Contact amplifier SV 110 (220 V - 240 V,

50/60 Hz, 110 - 130 V, 50/60 Hz)

S1 External switch contact

S2 Switch contact

F1 Fuse, control circuit

Q1 Motor protection switch

Signal lamps

H1 Motor protection switch: OFF

H2 Roots pump: ON

H3 Coil temperature: TOO HIGH

H4 Cooling air: BELOW MINIMUM

Links

BR on extension : - - remove link

Note

The above control circuit is designed so that the

Roots pump cuts in only if the pressure drops below

the set pressure level (B1).

Various connection options for different mains power supplies.

Motor junction box

3 x 230 V 50 Hz

3 x 265 V 60 Hz 3 x 400 V 50 Hz

3 x 460 V 60 Hz

Caution: for Cat.-No. 150 44 - 230V/50/60 Hz Caution: for Cat.-No. 150 44 - 400V/50/60 Hz

Installation and connection

16 GA 03.108/14.02 - 01/03

The threshold of pressure switch PS 115 is freely

adjustable.

The contact amplifier is identical for all pressure

switches.

Pressure switches and contact amplifiers with explosion

hazard protection are available upon request.

After removing a screw plug, the pressure switch (8/8)

together with an adapter (8/11) and a right-angle bend

(8/10) can be mounted on the bore (8/6).

When doing so, ensure proper sealing and air-tight

installation.

It is advisable to mount the switch vertically to reduce the

entry of contaminants.

3.4 Connection of the

Flanges

Already small quantities of liquids (from the

vacuum chamber or the piping) can lead to

liquid damages within the pump. These may

lead to a deformation of the impellers and

may entirely destroy the pump. Suitable pro-

tective measures should be provided as

required in the piping on the suction side

(separator, T-piece).

The RUVAC WS/WSU pumps have not

been designed to pump ignitable or explosi-

ve mixtures without additional protection.

If the pumps are none-the-less to be used

under such conditions, the customer hims-

elf must ensure that proper measures for

the purpose of protection against explosi-

ons (pressure monitor, flame arresters etc.)

are introduced in line with the requirements

of the applicable laws.

Explosion protected canned motors (tem-

perature class T 3 or T 4) are not available.

Consult us for advice.

The RUVAC WS pumps is vented with nitro-

gen. Only remove the packing flanges befo-

re immediate connection.

If not already done, remove the protective shipping

covers, cardboard pieces, foil or packing flanges from the

flanges (8/5) and (8/1).

We recommend that you retain the transport flanges of

the WS PFPE in case you want to store the pump at a

later date.

Clean the flanges and check that the sealing surfaces

are in perfect condition.

Flange the pump to the vacuum system.

Don’t place any stress on the pump casing

when installing the intake and exhaust lines.

Fit compensation elements in order to avoid

such stresses.

When attaching the pump directly (without

bolting down the feet) to the forevacuum

pump, you must always use on the pressu-

re side the full number of screws defined by

the flange standard (ISO-K, DIN or ASME)

whereby these must comply with the

demanded property class rating.

You must also check whether the backing

pump is rigid and stable enough to support

the load of the RUVAC pump in each case.

The dirt-trap which is supplied with the pump should

always be fitted into the intake flange when there is the

possibility of contaminants entering the pump coming

from the vacuum chamber or the piping. Even with clean

vacuum processes, contaminants from the system may

enter upon initial start-up. Depending on the operating

conditions, the dirt trap may reduce the pumping speed

of the pump.

Observe the maintenance information provided in Sec-

tion 5.1.

Caution

Warning

Caution

Operation

GA 03.108/14.02 - 01/03

4.1 Start-up

Check the pump motor’s direction of rotation (see Sec-

tion 3.3).

RUVAC WSU

The RUVAC WSU can be started together with the

backing pump at atmospheric pressure.

It is protected against excessively high pressure diffe-

rentials by a bypass line.

RUVAC WS

Do not switch on the RUVAC WS until the backing pump

has evacuated the vacuum vessel to the cut-in pressure.

For processes in which condensable vapours are pum-

ped, it is advisable to evacuate the vacuum vessel via a

roughing line to the cut-in pressure. Electrically switch on

the Roots pump together with the backing pump and cut

it in upon reaching the cut-in pressure. The initial bypas-

sing of the Roots pump serves to prevent condensation

of vapours in the cold pump.

The permissible cut-in pressure depends on the ratio

between the Roots pump and the backing pump. It can

be calculated according to the following formula:

pmax

pE= ———

kth - 1

pE= Cut-in pressure

pmax = Maximum permissible pressure differential

(see technical data)

kth = Theoretical compression ratio

= nominal pumping speed of Roots pump /

pumping speed of backing pump.

Example:

Pump combination:

RUVAC WS 501 / SOGEVAC SV 100

505 m3· h-1

kth = ————— ~5

100 m3· h-1

80 mbar

pE= ———— = 20 mbar

5 - 1

With small vacuum vessels, the maximum permissible

pressure differential can be briefly exceeded (max. 3

min) upon start-up. If a pressure switch has been instal-

led, do not set it to this higher pressure because it will fail

to protect the pump against overload in the event of a

greater gas quantity.

It is advisable to switch the RUVAC WS on and off via a

pressure switch to ensure that it runs only in the permis-

sible pressure range.

4.2 Operation

Do not operate the pump without having

connected the flanges to a vacuum system.

The screws of the flanges on the suction

and the pressure side must not be loosened

in the presence of a vacuum or while the

pump is still running.

During operation of the RUVAC, check the lubricant level

from time to time and also the condition of the lubricant.

Correct as required (see Section 5/2). Normally, the oil N

62 or HE-200 is light-brown. If it turns dark, this is a sign

of early ageing due to excessively high temperatures.

When using PFPE as intended, PFPE will not be subject

to ageing.

Run the Roots pump exclusively under the

operating conditions for which it has been

designed. Any modification of the operating

parameters (e. g. intake pressure, intake

temperature, ratio between Roots pump

and backing pump) for a longer period may

place an inadmissible thermal load on the

pump. Increases in temperature which are

not compensated by taking suitable measu-

res may damage the Roots pump and/or

the backing pump.

During normal operation temperatures

exceeding 80 °C may occur at the oil cham-

bers and at the line on the pressure side.

When touching these there is the danger of

receiving burns.

Note the labels on the pump.

Never open the oil-fill or oil-drain screw (Fig.

11) in the presence of a vacuum or while

the pump is running. There is the

danger that oil may squirt out.

4 Operation

Warning

Caution

Warning

Operation

18 GA 03.108/14.02 - 01/03

4.3 Shutdown and Storage

We recommend to keep the RUVAC WS

with a PFPE filling running even during pro-

longed intervals (e. g. over night) with the

intake line closed. This can help to avoid

corrosion during standstill.

Close the valve between the Roots pump and the vacu-

um system. First switch off the Roots

pump, then the backing pump.

After working with corrosive gases, the system should be

vented with dry protective gas (e.g. N2) to prevent corro-

sion during standstill.

When shutting down the pump and removing it from the

system, it is advisable to seal the connecting flanges

tightly.

Before removing pump from the vacuum

system, disconnect it from the mains supp-

ly.

Before removing the RUVAC WS PFPE from the system

it must be purged with nitrogen and sealed in a gas-tight

manner.

For transportation and storing of the pump, observe the

information provided in Section 2.

4.4 Changing from Vertical

to Horizontal Flow

The RUVAC WS/WSUs are supplied as standard for ver-

tical flow unless you specifically request horizontal flow.

Moreover, the pump may be converted from one flow

direction to the other.

For this proceed as follows:

Drain the lubricant (11/2) or (11/4) and tightly screw the

oil-drain plug back in. Remove the feet, turn the pump by

90° as shown in Fig. 5 (dimensional drawing) and mount

the feet for the new direction of flow.

The longitudinal axis of the pump must

remain horizontal so that no residual lubri-

cant can flow from the side chambers into

the pumping chamber.

Fill in lubricant (11/3); (see Section 3.2).

If a pressure switch has been installed, turn it so that it

again points vertically upwards.

The valve in the pressure balance line of the RUVAC

WSU is designed to work with both vertical and horizon-

tal flow of the pump.

Caution

Warning

Caution

Fig. 11 Changing the lubricant

Key to Fig. 11

1 Oil-level glass

2 Oil-drain plug for vertical flow

3 Oil-fill plug

4 Magnetic oil-drain plug for horizontal flow

Maintenance

GA 03.108/14.02 - 01/03

5 Maintenance

5.1 Safety Information

The safety information given in the following applies to all

maintenance work.

Disconnect the electrical power before

disassembling the pump. Make absolutely

sure that the pump cannot be accidentally

started.

If the pump has been pumping harmful sub-

stances, determine the nature of hazard

and introduce suitable safety measures.

Observe all safety regulations !

If you send a pump to LEYBOLD for repair

please indicate any harmful substances exi-

sting in or around the pump. For this use the

„Declaration of Contamination“ form which

has been prepared by us and which we will

provide upon request.

Any pump received by us without, or an

incompletely filled in declaration will delay

the repair.

When shipping contaminated pumps which

require approval by the authorities, you

must observe the applicable packaging and

shipping regulations.

All maintenance and cleaning work descri-

bed in this section must be carried out only

by suitably trained personnel.

When disposing of used lubricants please

observe the relevant environmental regula-

tions.

Improper maintenance or repairs may affect

the service life and performance of the

pump, and cause problems when filing war-

ranty claims.

Advanced repair work not described here

should be left to the LEYBOLD service.

We would like to point out that LEYBOLD offers training

courses on the maintenance, repair, and troubleshooting

of RUVAC pumps. Further details are available on

request.

5.2 Exchanging the

Lubricant

Before pumping oxygen (or other highly

reactive gases) at concentrations excee-

ding the concentration in the atmosphere

(> 21 % for oxygen) it will be necessary to

use a special pump. Such a pump will have

to be modified and de-greased, and an inert

special lubricant (like PFPE) must be used.

Observe all safety information provided in

Section 5.1.

Very little lubricant is consumed by wear in the bearings

and the gear under clean operating conditions. We

recommend changing the oil or PFPE after the first 500

hours of operation to remove any wearing residue.

Then, under normal operating conditions, change the oil

after every 3,000 hours of operation.

Change the oil more frequently when pumping corrosive

vapours or large amounts of dust or when cycling fre-

quently from atmospheric to working pressure.

Under such operating conditions it is recommended to

regularly check the neutralisation value (to DIN 51 558)

based on a sample of oil. If the neutralisation value

exceeds 2, an oil exchange will be required.

Before removing the oil-drain or oil-fill plug

always switch off the pump first and vent to

atmospheric pressure.

When the pump has become warm during

operation the casing and the oil temperatu-

re may exceed 80 °C.

Leave the pump to cool down. Always wear

protective gloves also to protect yourself

against aggressive residues in the oil.

To simplify the process and also for safety

reasons we recommend the use of our oil-

drain facility (see Section 1.4).

Unscrew the oil-drain plugs (11/2) or (11/4) and the oil-

fill plug (11/3) and drain the oil.

Clean the sealing surface and firmly reinstall the oil-drain

plug (11/2) or (11/4) using a gasket which is in perfect

condition. Wipe off any oil residues from the casing.

Fill in new oil.

For oil quantities and ordering data see Sections 1.3 and

1.4.

Make sure to use the right kind of oil. PFPE pumps are

marked with a red label.

Only use Leybold oil.

Warning

Caution

Warning

Maintenance

20 GA 03.108/14.02 - 01/03

Mineral oils, synthetic oils and PFPE do not

mix.

Please consult us if you intend to run the pump with

other oils or special lubricants.

At vertical flow the correct oil level is in the center of the

oil-level glass when the pump is not running.

In the case of horizontal pumping action, the correct oil

level is 4 mm over the middle of the oil level glass (11/1),

see also Fig. 9.

If the oil level is too low, the bearings and

gearwheels are not lubricated adequately; if

it is too high, oil may enter the pumping

chamber.

Clean the oil-fill port and reinstall the plug (11/3) using a

gasket which is in perfect condition. Wipe off any oil resi-

dues from the casing.

The oil-fill port must be sealed air-tight. In

the presence of a vacuum, the entry of air

may cause oil-containing gas to enter the

pumping chamber via the impeller seals.

When using PFPE as intended, PFPE is not subject to

ageing. It must only be changed if it is contaminated by

the process gas. It can only be determined for each indi-

vidual case when the PFPE is so contaminated that it

must be changed. To be sure, we recommend changing

the PFPE once a year.

Please also take note of the Operating Instructions

„PFPE for Vacuum Pumps“ included with the pump.

For recycling contaminated PFPE we ask you to consult

us. As PFPE we recommend our NC 1/14 or the

HE-1600.

5.3 Cleaning the Fan Cowl

and the Cooling Fins

Observe all safety information provided in

Section 5.1.

The slits in the fan cowl as well as the fins on the motor

and on the pump may be contaminated depending on

humidity conditions and the degree of contamination in

the ambient air.

In order to ensure a sufficient air flow for the motor and

the pump’s casing, the grid of the fan cowl must be clea-

ned with a clean brush when contaminated.

Any coarse dirt must be removed from the fins on the

motor and the pump.

5.4 Cleaning the Dirt Trap

Observe all safety information provided in

Section 5.1.

A wire-mesh sieve is located in the intake port to collect

foreign objects. It should be kept clean in order to avoid

a reduction of the pumping speed.

To do so, take off the intake line. Remove the dirt trap

from the intake flange and rinse it using a suitable sol-

vent. Then thoroughly dry it with compressed air. If the

dirt trap is damaged, replace it.

Caution

Warning

Maintenance

GA 03.108/14.02 - 01/03

5.5 Cleaning the Pumping

Chamber

Observe all safety information provided in

Section 5.1.

Under dirty operating conditions, contaminants may be

deposited in the pumping chamber or on the impellers.

After removing the two connecting lines, the contami-

nants can be blown out with dry compressed air or flus-

hed out with a suitable solvent.

Contaminants that cannot be blown or flushed out, can

be removed completely from the pumping chamber with

a wire brush, metallic sponge or scraper.

Then change the lubricant.

During cleaning, the blower must be turned

only by hand.

The loosened deposits must not remain in

the pump. After cleaning, check the pump

by slowly turning the impellers by hand.

They should move freely and without any

resistance.

Generally, the Roots pump does not need to

be disassembled. If necessary, this should

only be done by our after-sales service.

5.6 Cleaning the Valve of the

Pressure Balance Line

Observe all safety information provided in

Section 5.1.

Remove the screws and take off the cover (12/1) with

O-ring (12/2).

Take out the spring (12/4).

Remove the valve disk (12/6) with O-rings (12/5) and

(12/7).

If the bushing (12/3) is damaged, pull it out of the valve

disk and replace it.

Clean all parts or replace them if necessary. Reassem-

ble in the reverse sequence. When doing so, check the

O-rings for leak-tightness and replace if found faulty.

Warning

Caution

Warning

Fig. 12 Valve of the pressure balance line

Key to Fig. 12

1Cover

2 O-ring

3 Bushing

4 Spring

5 O-ring

6 Valve disc

7 O-ring

Maintenance

22 GA 03.108/14.02 - 01/03

5.7 Leybold Service

If a pump is returned to LEYBOLD, indicate whether the

pump free of substances damaging to health or whether

it is contaminated.

If it is contaminated also indicate the nature of the

hazard. For this you must use a form which has been

prepared by us which we will provide upon request.

A copy of this form is reproduced at the end of these

Operating Instructions: „Declaration of Contamination of

Vacuum Instruments and Components“.

Please attach this form to the pump or enclose it with the

pump.

This „Declaration of Contamination“ is required to meet

German Law and to protect our personnel.

LEYBOLD must return any pumps without a „Declaration

of Contamination“ to the sender’s address.

The pump must be packed in such a way,

that it will not be damaged during shipping

and so that any contaminants are not relea-

sed from the package.

Warning

Troubleshooting

GA 03.108/14.02 - 01/03

6 Troubleshooting

Fault Possible cause Remedy Repair*

Pump does not

start.

Pump gets too hot.

Motor is connected incorrectly.

Thermal switch or motor stator is malfunctioning.

Pressure switch is malfunctioning.

Lubricant is too viscous.

Motor rotor is malfunctioning.

Pump has seized up: damaged impellers, bearings

or gearwheels.

Connect the motor correctly.

Leybold service.

Replace the pressure switch.

Change the lubricant or

warm the lubricant and the pump.

Leybold Service

3.3

5.2

Ambient temperature is too high or cooling air

supply is restricted.

Pump is working in the wrong pressure range.

Pressure differential is too great.

Gas temperature is too high.

Clearance between casing and impellers is too

small due to:

- contamination

- distortion of pump.

Excessive frictional resistance due to contaminated

bearings and/or lubricant.

Lubricant level is too high.

Lubricant level is too low.

Wrong lubricant has been used.

Bearings are malfunctioning.

Fan incorrectly or not connected

Fan faulty

Valve of pressure balance line does not open.

Install the pump at a suitable site or ensure

enough cooling air.

Check pressure values of vacuum system.

Check the vacuum system.

Clean the pumping chamber.

Ensure that the feet and connecting lines

aren’t placing a strain on the pump.

Drain some lubricant to reach the correct level.

Add lubricant to reach the correct level.

Drain lubricant and fill in correct lubricant.

Leybold service

Connect the fan correctly

Leybold service

Clean or repair the valve.

3.1/5.3

5.5

3.1/3.4

5.2

3.3

5.6

Power consumption

of the motor is too

high.

See fault „Pump gets too hot“.

Wrong mains voltage supply for the motor.

Motor stator is malfunctioning.

Motor rotor is malfunctioning.

See fault „Pump gets too hot“.

Connect the motor to the correct voltage supply.

Leybold service

1.3/3.3

Pump loses lubri-

cant. Lubricant leak is visible:

Oil-drain plug is not tight.

Oil-level glass is not tight.

Gearbox is not tight.

Oil puddle under the motor, leaky can

No lubricant leak is visible:

See fault „Lubricant in the pumping chamber“.

Drain lubricant, firmly screw in the oil-drain plug

with a new gasket, fill in the correct quantity.

Leybold service

Replace the O-ring of the gearbox cover.

Leybold service, switch off the pump immediately.

See fault „Lubricant in the pumping chamber“.

Lubricant in the

pumping chamber. Lubricant level is too high.

Lubricant leaks out of the system.

Pump is not installed on a flat horizontal surface.

Pump has an external leak.

Pump has an internal leak.

Impeller rings are malfunctioning.

Drain lubricant to reach the correct oil level.

Check system.

Install pump correctly.

Check proper fit of oil-fill and oil-drain plugs,

replace gaskets if necessary.

Replace O-ring of the gearbox cover.

Leybold service

5.2

3.1

5.2

Pumping speed of

the pump is too low. Dirt trap in the intake flange is clogged.

Motor is connected incorrectly.

Motor stator is malfunctioning.

Motor rotor is malfunctioning.

Pump or pump system has a leak.

Clearance of impellers is too large.

Bearing is malfunctioning.

Valve of the pressure balance line does not close.

Clean the dirt trap.

Connect the motor correctly.

Leybold service

Find and seal the leak.

Leybold service

Clean or repair the valve.

5.4

3.3

5.6

Pump is too noise. Clearance between casing and impellers is too

small due to :

- contamination

- distortion of the pump.

Bearing or gearing is damaged.

Impellers strike the casing.

Motor rotor runs out of true.

Centrifugal disc lubricator strikes gear lid

or oil tube.

Oil pump obstructed or malfunctioning.

Clean the pumping chamber.

Ensure that the feet and connecting lines aren’t placing a strain

on the pump.

Leybold service, switch off the pump immediately.

Leybold service

Leybold service, switch off the pump immediately.

5.5

3.1/3.4

Oil turns dark. Oil has broken down.

Pump gets too hot. Change the oil.

See fault „Pump gets too hot“; after solving the

problem, change the oil.

5.2

* for repair information, refer to the stated section in the Operating Instructions

GA 03.108/14.02 - 01/03

We - LEYBOLD Vacuum GmbH - herewith declare that

the products defined below meet the basic requirements

regarding safety and health of the relevant EEC direc-

tives by design, type and the versions which are brought

in to circulation by us.

In case of any products changes made without our

approval, this declaration will be void.

Designation of the products: Roots pump

Types: RUVAC WS 251 - 2001

RUVAC WSU 251 - 2001 (H)

Catalogue numbers: 101 83

117 22; 117 23; 117 27; 117 28;

117 32; 117 33; 117 37; 117 38;

117 42; 117 43; 117 47;

117 52; 117 53; 117 57;

118 33; 118 43; 118 53;

150 44; 150 95; 150 96

167 007

917 48

155 000

EEC Declaration of Conformity

The products conform to the following directives:

• EC Directive on Machinery (98/37/EG)

• EC Directive on Low-Voltages (73/23)+(93/68/EWG)

• EC EMC Directive (89/336/EWG)

(91/263/EWG) + (92/31/EWG) + (93/68/EWG)

Applied harmonised standards:

• DIN EN 292 Part 1 11.91

• DIN EN 292 Part 2 06.95

• DIN EN 1012 Part 2 07.96

• DIN EN 60 204 Part 1 11.98

Applied national standards and technical

specifications:

• DIN 31 001 April 1983

• DIN ISO 1940 Dec. 1993

Cologne, October 30, 2002

—————————————————————

Hauck, BU Head SPS

Division Industrial

Cologne, October 30, 2002

—————————————————————

Dr. Beyer, Development Head SPS

Division Industrial

GA 03.108/14.02 - 01/03 25

GA 03.108/14.02 - 01/03

LEYBOLD VAKUUM GmbH

Bonner Strasse 498 (Bayenthal)

D-50968 Köln

Tel.: (0221) 347-0

Fax: (0221) 347-1250

http://www.leyboldvac.de

e-mail:documentation@leyboldvac.de

LV_xxxxx_2003 BICOM/OF 01.03

Printed in Germany on chlorine-free bleached paper

USA:

LEYBOLD VACUUM USA

5700 Mellon Road

Export, PA 15632

Phone: +1-724-327 57 00

Fax: +1-724-733 12 17

Internet: http://www.

leyboldvacuum.com

Canada:

LEYBOLD Canada Inc.

7050 Telford Way, Unit 5

Mississauga, Ontario

Canada L5S 1V7

Phone: +1-905-672 77 04

Fax: +1-905-672 22 49

e-mail:

reachus@leybold.on.ca

AMERICA EUROPE ASIA

Deutschland:

LEYBOLD VAKUUM

GmbH

Bonner Straße 498

D-50968 Köln

Phone: +49-221-347-1234

Fax: +49-221-347-12 45

Internet: www.leybold

e-mail:

sales

leybold

vakuum.com

Belgien/Niederlande/

Luxemburg:

LEYBOLD N.V.

Leuvensesteenweg 542, 9A

B-1930

Zaventem

Phone: +32-2-71 10 083

Fax: +32-2-72 08 338

LEYBOLD B.V.

Computerweg 7

NL-3606 AV Maarssen

Phone: +31-346-583 999

Fax: +31-346-583 990

Frankreich:

LEYBOLD S.A.

7, Avenue du Quebec

Z.A. de Courtaboeuf, B.P. 42

F-91942

Courtaboeuf

Cedex

Phone: +33-1-69 82 48 00

Fax: +33-1-69 07 57 38

e-mail: leybold-vacuum@

leybold.fr

Groß-Britannien/Irland:

LEYBOLD LTD.

Waterside Way,

Plough Lane

GB-London SW 17 OHB

Phone: +44-208-97170 00

Fax: +44-208-97170 01

Italien:

LEYBOLD S.P.A.

Via Trasimeno 8

I-20128 Milano

Phone: +39-02-27 22 31

Fax: +39-02-27 20 96 41

Spanien:

LEYBOLD S.A.

C/. Mataró, 27

Polígono Industrial Les

Grases

E-08980 Sant Feliu de

Llobregat (Barcelona)

Phone: +34-93-666 46 16

Fax: +34-93-666 43 70

Schweden:

LEYBOLD AB

Box 9084

40092 Göteborg

Phone: +46-31-68 84 70

Fax: +46-31-68 39 39

Schweiz/

Liechtenstein:

LEYBOLD AG

Leutschenbachstraße 55

CH-8050 Zürich

Phone: +41-1-308 40 50

Fax: +41-1-302 43 73

Volksrepublik China:

LEYBOLD (Tianjin)

VACUUM EQUIPMENT

MANUFACTURING Co.,

Ltd.

Beichen Economic Develop-

ment Area (BEDA)

Tianjin 300400, China

Phone: +86-22 26 972 016

Fax: +86-22 26 972 017

e-mail:

leybold@public.tpt.tj.cn

Japan:

LEYBOLD Co., Ltd.

Head Office

Tobu A.K. Bldg. 4th Floor

23-3, Shin-Yokohama 3-

chome

Kohoku-ku,Yokohama-shi

Kanagawa ken 222-0033

Phone: +81-45-471 33 30

Fax: +81-45-471 33 23

Korea:

LEYBOLD Korea Ltd.

4th Fl. Shinan Bldg., 173-1

Jangchoog-dong 2ga,

Choong-ku

Seoul 100-392, Korea

C.P.O. Box 709

Phone: +82-2-227 11 567

Fax: +82-2-227 11 568

Singapore:

BALZERS and LEYBOLD

Singapore Pte. Ltd.

1 Tuas South Street 3

Singapore 638043

Phone: +65-865 18 65

Fax: +65-862 22 95

Taiwan:

LEYBOLD Taiwan, Ltd.

2 F, No 416-1, Sec. 3

Chung-Hsin Rd.

Chu Tung, Hsinchu.

Taiwan R.O.C: 310

Phone: +886-3-583 39 88

Fax: +886-3-583 39 99

Sales Net worldwide

GA 03.108/14.02 Ws Wsu

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