Emerson Series 300 Users Manual Operator's For ATS H 600 1200 A UL/CSA

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381333–201 G

50 Hanover Road, Florham Park, New Jersey 07932–1591 USA

For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com

ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3

Operator’s

Manual

Series 300

Automatic Transfer Switches

H–design, 600 through 1200 A

DANGER is used in this manual to warn of a

hazardous situation which, if not avoided, will

result in death or serious injury.

WARNING is used in this manual to warn of a

hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION is used in this manual to warn of a

hazardous situation which, if not avoided, could

result in minor or moderate injury.

600, 800, 1000 A sizes

Refer to the outline and wiring drawings provided with

your ASCO Series 300 ATS for all installation details.

Rating Label

Each automatic transfer switch contains a rating label to

define the loads and fault circuit withstand / closing ratings.

Refer to the label on the transfer switch for specific values.

Do not exceed the values on the rating label.

Exceeding the rating can cause personal injury or

serious equipment damage.

An experienced licensed electrician must install the

Automatic Transfer Switch (ATS).

TABLE OF CONTENTS

section-page

INSTALLATION 1-1........................

Mounting and Line Connections 1-1.........

Engine Starting Contacts 1-2...............

Input / Output Label 1-2....................

Functional Test 1-3, 1-4, 1-5.................

SEQUENCE OF OPERATION 2-1...........

TESTING & SERVICE 3-1..................

Preventive Maintenance 3-1................

Transfer Test 3-1..........................

Disconnecting the Controller 3-1............

Manual Load Transfer 3-2..................

Trouble-Shooting 3-2......................

ADJUSTMENTS 4-1.......................

Time Delay and Sensor Adjustments 4-1.....

How to Change a Setting 4-2...............

CONTROL FEATURES 5-1.................

Engine Exercisers 5-1, 5-2, 5-3..............

Motor Load Transfer 5-4...................

Load Disconnect & Remote Control 5-4......

INDEX back of manual.....................

Nameplate

The Transfer Switch nameplate includes data for

each specific ASCO Series 300 ATS. Use the ATS

only within the limits shown on this nameplate.

Catalog Number Identification

A typical Catalog Number is shown below with its

elements explained. The example is for a Series 300

ATSwithswitchedneutral,3pole,600ampere,

480 V, in a Type 1 enclosure:

H 300 B 3 600 N 1 C

Phase Poles

Neutral

C– overlapping

Amperes Voltage Controller Enclosure

B–switched 1–standard

G–type4 *

C–type1

F–type3R

L–type12 *

3–threeØ

2–singleØ

D220

C208

E230

K415

M460

J400

L440

N480

F240

H380 Q575

R600

1200

1000

600

800

blank – solid

blank – open type

* available 600 – 1000 A sizes only

1X –if

accessories

ordered

terminal block TB

for engine start

and switch

position contacts

Transfer

Switch

Controller

power

connections

power

connections

membrane

controls

600 ampere size in typical enclosure with location of customer connections

neutral

connections

neutral

connections

terminal block TB

for engine start

and switch

position contacts

Transfer

Switch

Controller

power

connections

power

connections

membrane

controls

800 and 1000 ampere sizes in typical enclosure with location of customer connections

neutral

connections

neutral

connections

terminal block TB

for engine start

and switch

position contacts

Transfer

Switch

Controller

power

connections

power

connections

membrane

controls

1200 ampere size in typical enclosure with location of customer connections

neutral

connections

neutral

connections

SECTION 1 INSTALLATION

1 --- 1

Series 300 Automatic Transfer Switches are factory

wired and tested. Installation requires skid removal

then securing the enclosure to the supporting

foundation.

Remove the Shipping Skid

Open the front door and remove the four lag screws (2

in front, 2 in rear) securing enclosure to the wood skid.

Supporting Foundation

The supporting foundation for the enclosure must be

level and straight. Refer to the applicable enclosure

outline drawing included with the Series 300 for all

mounting details including door opening space.

If bottom cable entry is used, the foundation must be

prepared so that the conduit stubs are located

correctly. Refer to the enclosure outline drawing for

specified area and location. Provide cable bending

spaceandclearancetolivemetalparts. Whena

concrete floor is poured, use interlocking conduit

spacer caps or a wood or metal template to maintain

proper conduit alignment.

Mounting

Refer to the applicable enclosure outline drawing

furnished with this switch and mount the Series 300

according to details and instructions shown on diagram.

Line Connections

Refer to the Wiring Diagram provided with your Series

300 ATS. All wiring must be made in accordance with

the National Electrical Code and local codes.

It is unnecessary to remove pole covers from the

transfer switch. If you do remove them, reinstall them

carefully.

De–energize the conductors before making any

line or auxiliary circuitry connections. Be sure

that Normal and Emergency line connections

are in proper phase rotation. Place engine

generator starting control in the OFF position.

Make sure engine generator is not in operation.

Testing Power Conductors

Do not connect the power conductors to the ASCO

Series 300 transfer switch until they are tested.

Installing power cables in conduit, cable troughs and

ceiling-suspended hangers often requires considerable

force. The pulling of cables can damage insulation and

stretch or break the conductor’s strands. For this

reason, after the cables are pulled into position, and

before they are connected, they should be tested to

verify that they are not defective or have been

damaged during installation.

NOTICE

Protect the automatic transfer switch from

construction grit and metal chips to prevent

malfunction or shortened life of the ATS.

Connecting Power Conductors

After the power cables have been tested, connect them

to the appropriate terminal lugs on the transfer switch

as shown on the wiring diagram provided with this

Series 300. Make sure the lugs provided are suitable

for use with the cables being installed. Standard

terminal lugs are solderless screw type and will accept

thewiresizeslistedonthedrawingsprovidedwiththe

Series 300. Be careful when stripping insulation from

the cables; avoid nicking or ringing the conductor.

Remove surface oxides from cables by cleaning with a

wire brush. When aluminum cable is used, apply joint

compound to conductors. Tighten cable lugs to the

torque specified on rating label.

Controller Ground

A grounding wire must be connected to the controller’s

lower left mounting stud. Because the controller is

mounted on the enclosure door, a conductive strap

must be used between the enclosure and the door.

This connection provides proper grounding which does

not rely upon the door hinges.

Harnesses

The transfer switch is connected to the left side of the

controller by a plug–in harness (two plugs).

terminal block for engine start and

auxiliary circuit connections

left side of

transfer switch

COMMON

FEATURE 7

closes to start

FEATURE 8

opens to start

COMMON

FEATURE 14B

closed on emergency

FEATURE 14A

closed on normal

COMMON

FEATURE 14BA

closed on emergency

FEATURE 14AA

closed on normal

Engine Starting

Signals

5amps,32VDC

5ampsresistive28VDC

or 120 V AC max.

TS Auxiliary Contacts

Feature 14A & 14B

10 amps, 32 V DC

10 amps 250 V AC

general purpose

Optional

TS Auxiliary Contacts

Feature 14AA & 14BA

10 amps, 32 V DC

10 amps 250 V AC

general purpose

INSTALLATION (continued)

1 --- 2

Engine Starting Contacts

Customer connections for engine control contact and

TS auxiliary contacts connections are located on

terminal block TB which is mounted on the front lower

left of the transfer switch. Refer to wiring diagram

provided with the Series 300 ATS and connect the

engine start wires to the appropriate terminals. See

Figure 1–1 and Table A.

Table A. Engine start connections.

When normal

source fails

Te r m i n a l s

on transfer

switch

contact closes TB1 and TB2

contact opens TB1 and TB3

Auxiliary Circuits

Connect auxiliary circuit wires to

appropriate terminals on transfer

switch terminal block TB as shown

on the wiring diagram provided

with this Series 300 Automatic

Transfer Switch. Make the neces-

sary auxiliary connections by

referring to Section 5, Control

Features.

Connections to Controller

for other Control Features

(located on bottom of Controller)

Figure 1-1. Engine start and auxiliary circuit

terminal block TB located on the transfer switch.

for factory

use only

Remote Control Features Connections

(refer to the Wiring Diagram &

page 5–4 for DIP switch settings)

Each control contact must be suitable

for a 5 V DC low energy circuit.

Programmable

Engine Exerciser

connection,

if provided

(refer to

page 5–3)

Load Disconnect

Feature

Connections

(see Wiring Diagram

& refer to page 5–4

for DIP switch settings)

Figure 1-2. Input / output label on the Controller showing possible connections to the lower terminal block.

INSTALLATION (continued)

1 --- 3

Functional Test

The Functional Test consists of three checks: manual

operation, voltage checks, and electrical operation.

NOTICE

Do these checks in the order presented to avoid

damaging the automatic transfer switch.

Read all instructions on the Wiring Diagram and labels

affixed to the automatic transfer switch. Note the

control features that are provided and review their

operation before proceeding.

1 – Manual Operation Test

A detachable maintenance handle is provided on the

frame of the Transfer Switch for maintenance purposes

only. Manual operation of the transfer switch should be

checked before it is energized (operated electrically).

Do not manually operate the transfer switch until

both power sources are disconnected: open

both circuit breakers.

1. After deenergizing both power sources, open the

enclosure door. Locate and remove the mainte-

nance handle from the clips on the left side of the

transfer switch frame. Insert the handle into the

holeinthemoldedhubontheleftsideofthe

operator. See Figures 1–3 and 1–4 and Table B.

2. Move the maintenance handle up or down as shown

to manually operate the transfer switch. It should

operate smoothly without any binding. If it does not,

check for shipping damage or construction debris.

Table B. Maintenance handle positions.

ATS Position Handle Indicators

Normal

E

N

up E=O

upper contacts open

N=C

lower contacts closed

Emergency

E

Ndown

E=C

upper contacts closed

N=O

lower contacts open

maintenance

handle

left side of

transfer switch

storage clips

Figure1-3.Maintenancehandle&storagelocation.

3. Return the transfer switch to the Normal position.

Observe that window indicators (right side) show the

top shaft O (open) and the bottom shaft C (closed).

Note: If Normal and Emergency connections are

reversed this operation is also reversed.

4. Remove the maintenance handle and store it on the

frame (left side) in the clips provided.

NOTICE

Verify that the maintenance handle has been

removed before proceeding!

Now continue to 2–VoltageCheckson next page.

handle

hub

UP closes the

Normal source

contacts (lower)

DOWN closes the

Emergency source

contacts (upper)

frame

window

indicators

Ois open

Cis closed

Emergency

contacts

Normal

contacts

contact position

indicators (right side)

Figure 1-4. Maintenance handle operation and contact position indicators.

INSTALLATION (continued)

1 --- 4

observe these lights

Figure 1–5. St andard controls and indicators.

2–VoltageChecks

First check nameplate on transfer switch; rated voltage

mustbethesameasnormalandemergencyline

voltages.

Use extreme caution when using a meter to

measure voltages in the following steps.

Do not touch power terminals; shock, burns, or

death could result !

Perform steps 1 through 6 at the right. Observe the

status lights. See Figure 1–5.

OBlack circle means light is on.

PWhite circle means light is off.

* If necessary, adjust voltage regulator on the

generator according to the manufacturer’s

recommendations. The Automatic Transfer Switch will

respondonlytotheratedvoltagespecifiedonthe

Transfer Switch nameplate.

Also see page 4–1 for the HI–LOW voltage adjust

setting in the controller. The LOW setting shifts all

voltage settings down 4.2%; for example, 240 V to

230V.

1

Close the normal source circuit

breaker. The Normal Transfer

Switch Position and the Normal

Source Accepted lights should

come on.

Source Accepted

Normal

Emergency

2

Use an accurate voltmeter to

check phase to phase and

phase to neutral voltages pres-

entatthetransferswitchnormal

source terminals.

3

Close the emergency source

circuit breaker. (Start generator,

if necessary.) The Emergency

Source Accepted light should

come on.

Source Accepted

Normal

Emergency

4

Use an accurate voltmeter to

check phase to phase and

phase to neutral voltages pres-

ent at the transfer switch emer-

gency source terminals.*

5

Useaphaserotationmeterto

check phase rotation of emer-

gency source; it must be the

same as the normal source.

ABC

6

Shut down the engine–genera-

tor, if applicable. The Emergen-

cy Source Accepted light should

go off. Then put the starting

control selector switch (on the

generator set) in the automatic

position. Close enclosure door.

Source Accepted

Normal

Emergency

Now continue to 3 – Electrical Operation on next page.

INSTALLATION (continued)

1 --- 5

pressthisbutton

observe these lights

Figure 1–6. Standard controls and indicators.

3 – Electrical Operation

This procedure will check the electrical opertion of the

Automatic Transfer Switch. See Figure 1–6.

Close the transfer switch enclosure door and

tighten the screws before you test electrical

operation.

Transfer Test

Both normal and emergency sources must be available

and the emergency source generator (if used) must be

capable of being started in this procedure.

Perform steps 1 through 8 at the right. Observe the

status lights.

OBlack circle means light is on.

PWhite circle means light is off.

NOTE: If Motor Load Transfer

feature is activated, then transfer may

not occur immediately after the

respective time delays. Transfer will

only occur when the phase relation-

ship between sources is correct.

This completes the Functional Test of the ASCO

Series 300 Automatic Transfer Switch. Leave the

engine–generator starting control in the automatic

position.

1

The normal source must be

available and the generator

must be ready to start.

Check that the Normal Source

Accepted light is on.

Source Accepted

Normal

Emergency

2

Press and hold the Transfer Test

button until the engine starts

and runs. This should happen

within 15 sec.

Transfer

Tes t

3The Emergency Source

Accepted light should come on.

Source Accepted

Normal

Emergency

4

The transfer switch should

transfer to the Emergency

position. The Emergency

Transfer Switch Position light

should come on and the Normal

light should go off.

Transfer Switch

Position

Normal

Emergency

5

If the transfer to emergency

delay is used the transfer

should occurs after a time delay

(up to 5 minutes).

Forimmediatetransferpress

the Bypass Time Delay button.

Bypass

Time Delay

6

The transfer switch should

transfer back to the Normal

position. The Normal Transfer

Switch Position light should

come on and the Emergency

light should go off.

Transfer Switch

Position

Normal

Emergency

7

If the retransfer to normal delay

is used the retransfer should

occur after a time delay

(up to 30 minutes).

Forimmediateretransferpress

the Bypass Time Delay button.

Bypass

Time Delay

8

The unloaded running delay

keeps the generator running for

5 minutes (cool–down period).

Then the generator should stop

and the Emergency Source

Accepted light should go off.

Source Accepted

Normal

Emergency

Hold 15 sec.to

start the engine

generator and to

transfer the load

to emergency.

Press to cancel the

active exercise period

(stops engine now or

after cooldown) See

page 5–1.

Hold 5 sec.toset

20 min. engine exercise

period immediately (engine

starts) and weekly thereafter.

³blinks slowly when

button is released (set)

and during 20 min.

exercise period.

³blinks rapidly when

button is held 5 sec.

while being set

Lights show position of transfer switch. Lights show the sources accepted.

Light for built–in

engine exercise timer:

Seepage5–1

for complete

instructions

Figure 2–1. Membrane controls and indicator lights.

³stays on after engine

stops (exerciser is

enabled for weekly

operation)

SECTION 2 SEQUENCE OF OPERATION

2 --- 1

Transfer To Emergency

Thesequenceforloadtransferto

emergency source begins automatical-

ly when normal source voltage falls

below the preset dropout point or

when Transfer Test button is pressed.

An under voltage condition on any

phase of the normal source is de-

tected by the sensor.

When the normal

source voltage fails or

the Transfer Test

button is pressed, the

SE relay de-energizes

and relay NR begins

its timing cycle (1 or 3

seconds, momentary

normal source outage

delay). The NR relay is provided with a time delay on

dropout to override momentary outages and prevent

nuisance starting of the engine-driven generator. If the

normal source voltage returns above the sensor dropout

setting before the time delay expires, the NR relay timing

cycle is reset to zero and relay SE energizes.

If the normal source voltage does not return above the

sensor dropout setting before the time delay expires, the

NR relay de-energizes and signals the engine-driven gen-

erator to start. At the same time, a voltage and frequen-

cy sensor begins monitoring the emergency source. The

sensor will accept the emergency source only when both

voltage and frequency reach preset pickup points. Usual-

ly about ten seconds elapse from dropout of the NR relay

to acceptance by the sensor. This time span occurs be-

cause the engine-driven generator must crank, start, and

run up to nominal pickup points. For this reason, if the

Transfer Test button is pressed it must be held for 15 sec-

onds. If the emergency source is available immediately,

the sensor may accept it as soon as NR relay drops out.

When the emergency source is accepted by the sensor,

relay ER begins its timing cycle (transfer to emergency

delay). ER relay is provided with an adjustable (0 to 5

minutes) time delay on pickup to delay transfer of the

load to the emergency source. For immediate transfer

press Bypass Time Delay button.

ER relay energizes, the TS coil is energized, the transfer

switch operates, and all switch contacts (mains, controls,

auxiliaries) reverse position. The transfer switch is now

supplying the load from the emergency source.

ThetransferswitchwillremainintheEmergency

position until the normal source is restored. If the

Transfer Test button is used, the transfer switch will

remain on emergency until the retransfer to normal

delay times out.

Retransfer to Normal

The sequence for load retransfer to the normal source

automatically begins when the voltage sensor detects

restoration of the normal source. The voltage level

must rise above the preset pickup point on all phases

before the sensor will accept the normal source.

Whenthenormalsourceisacceptedbythesensor,

relay SE begins its timing cycle (adjustable 1 sec. to 30

min., retransfer to normal delay). For immediate

retransfer press Bypass Time Delay button. SE relay is

provided with a time delay on pickup to prevent

immediate load retransfer to the normal source. The

delay insures that the normal source has stabilized

before reconnection of vital loads. If the normal

source voltage falls below the present dropout point

before the time delay expires, the timing cycle is reset

to zero. If the emergency source fails for more than 4

seconds during the timing cycle, ER relay drops out

and the load is immediately retransferred to the

normal source, if that source is acceptable.

SE relay energizes and ER relay is dropped out. The

TS coil is energized, the transfer switch operates, and

all switch contacts (mains, controls, auxiliaries) reverse

position. The transfer switch is now supplying the load

from the normal source again.

Upon retransfer to the normal source, NR relay begins

its timing cycle (unloaded running delay, engine cooldown).

NR relay is provided with a 5 min. time delay on pickup

to keep the engine running for a cool-down period.

NR relay energizes after the time delay and signals the

engine-driven generator to shut down. All circuits are

reset for any future normal source failure.

Activation of standard control features shown in Section 5 will

alter the sequence of operation and introduce additional time

delays during transfer operations.

SECTION 3 TESTING & SERVICE

3 --- 1

PREVENTIVE MAINTENANCE

For high reliability and long life for the ATS:

Operate the switch at least once a month.Performthis

4–step Electrical Operation Test (test with load transfer).

Transfer Switch Test

1. Press and hold the door-mounted Transfer Test button

until the engine starts and runs. This should happen

within 15 seconds.

2. The transfer switch will operate to the Emergency

position. If the Transfer To Emergency Delay is used,

thetransferwilloccurafteratimedelay(upto5

minutes). For immediate transfer press Bypass

Time Delay button.

3. The Transfer Switch will operate back to the Normal

position after the Retransfer To Normal Delay (up to

30 minutes). For immediate retransfer press

Bypass Time Delay button.

4. Unloaded Running (Engine Cooldown) Delay allows

engine to run unloaded for 5 minutes.

Checklist for Yearly Inspection

Hazardous voltage capable of causing shock,

burns, or death is used in this switch.

Deenergize both Normal & Emergency power

sources before performing inspections!

SClean the enclosure.De–energize all sources,

then brush and vacuum away any excessive dust

accumulation. Remove moisture with a clean cloth.

SCheck the transfer switch contacts. De-energize

all sources, then remove the transfer switch barriers

and check contact condition. Replace the contacts if

they become pitted or worn excessively. Reinstall the

barriers carefully.

SMaintain transfer switch lubrication.Under

normal operating conditions no further lubricating

is required. Renew factory lubrication if the switch

is subjected to severe dust or abnormal operating

conditions or if TS coil is replaced. Order lubricant

kit 75–100.

SCheck all cable connections & retighten them.

Torquetovaluesshownontransferswitchlabel.

Replacement parts. When ordering parts provide the

Serial and Catalog Nos. from the transfer switch

nameplate. Contact ASI. In the US call

1–800–800–ASCO (2726)).

DISCONNECTING THE CONTROLLER

The harness disconnect plugs are furnished for repair

purposes only and should not have to be unplugged.

If the controller must be isolated, follow these steps

carefully.

Disconnecting the Plugs

1. Observe the position of the transfer switch.

a. If the transfer switch is in the Normal position,

place standby engine starting control in the off

position. Then open the emergency source circuit

breaker.

b. If the transfer switch is in the Emergency position,

open the normal source circuit breaker. Place the

engine starting control in the test or run position.

2. Separate the quick disconnect plugs by squeezing

the latches. Do not pull on the harness wires.

3. Label, remove, and tape the signal wires connected

to the engine start terminals on the transfer switch:

TB1 and TB3, or TB1 and TB2.

Reconnecting the Plugs

1. Observe the position of the transfer switch.

a. If the transfer switch is in the Normal position, be

sure that the standby engine starting control is

still in the off position. The emergency source

circuit breaker still should be open.

b. If the transfer switch is in the Emergency position,

normal source circuit breaker still should be open.

2. Reconnect the signal wires connected to the

appropriate engine start terminals on the transfer

switch. See Section 1,Engine Starting Contacts.

3. The harness plugs and sockets are keyed.

Carefully align the plugs with the sockets

and press straight in until both latches click.

4. Restore the opposite source as follows:

a. If the transfer switch is in the Normal position,

place the standby engine starting control in the

automatic position. Then close the emergency

source circuit breaker.

b. If the transfer switch is in the Emergency position,

close the normal source circuit breaker. The load

will be automatically retransferred to the normal

source after the Retransfer to Normal Delay.For

immediate retransfer, press Bypass Time Delay

button. Place the engine starting control in the

automatic position.

TESTING & SERVICE (continued)

3 --- 2

MANUAL LOAD TRANSFER

This procedure will manually transfer the load if the

controller is disconnected.

Do not manually operate the transfer switch

until both power sources are disconnected:

open both circuit breakers.

1. Open normal and emergency source circuit breakers.

2. Use the maintenance handle to manually operate

transfer switch to the opposite source. See page

1–3, Manual Operation Test.

3. If the transfer switch is in the Emergency position

manually start the engine generator and then close

the emergency source circuit breaker.

TROUBLE-SHOOTING

Note the control features that are activated or

furnished on the switch and review their operation.

Refer to Section 5,Control Features.

Proceed with care! The automatic transfer switch

is energized.

Table 3-1. Trouble-Shooting Checks.

P

R

O

B

L

E

M

CHECK IN NUMERICAL SEQUENCE

P

R

O

B

L

E

M

1OPERATION 2 GEN-SET 3VOLTAGE

Gen-Set does not start when

the Transfer Test button is

pressed and held for 15

seconds or when the normal

source fails.

Hold the Transfer Test button

15sec.ortheoutagemustbe

long enough to allow for the 1

or 3 sec. Momentary Normal

Source Outage Delay plus

engine cranking and starting

time.

Starting control must be in

automatic position. Batteries

must be charged and

connected. Check wiring to

engine starting contacts.

—

Transfer switch does not

transfer the load to

emergency source after the

gen-set starts.

Wait for Transfer to Emergen-

cy Delay (0 to 5 min.) to time

out. For immediate transfer,

press the Bypass Time Delay

button. If Motor Load Transfer

is active, wait for inphase con-

dition (see below).

Generator output circuit

breaker must be closed.

Generator frequency must be

at least 57 Hz.

Voltmeter should read at least

90% of nominal phase to

phase voltage between

transfer switch terminals EA

and EC (or EL1 and EL2 for 2

pole switches). *

* These are factory settings.

Transfer switch does not

transfer the load to normal

source when normal returns

or when Transfer Test button

is released.

Wait for Retransfer to Normal

Delay (1 sec. to 30 min.) to

time out. For immediate re–

transfer, press Bypass Time

Delay button. If Motor Load

Transfer is active, wait for in-

phase condition (see below).

—

Voltmeter should read at least

90% of nominal phase to

phase voltage between

transfer switch terminals NB

and NC, NC and NA, and NA

and NB (or NL1 and NL2 for 2

pole switches).

Gen-Set does not stop after

load retransfer to the normal

source.

Wait for the 5 minute

Unloaded Running Delay to

time out.

Starting control must be in

automatic position. —

Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–4)

Use extreme caution when using a meter to

measure voltages in the following steps. Do not

touch power terminals; shock, burns, or death

could result !

1. Connect a voltmeter (set for twice system

phase–to–phase voltage) between Transfer Switch

terminals NA and EA.

2. Manually start generator. Voltmeter needle should

sweep back and forth at a regular rate between 0

and about twice system voltage.

3. Press and hold Transfer Test button. The load

should transfer to emergency source when meter

needle is near 0 volts. If transfer does not occur,

Motor Load Transfer feature is not operating.

4. Release the Transfer Test button. The load should

retransfer back to the normal source after the

Retransfer to Normal Delay,ifused. Theretransfer

should occur when the needle is near 0 volts. If

retransfer does not occur after the time delay, the

Motor Load Transfer feature is not operating.

5. For immediate retransfer, press the Bypass Time

Delay button. Then disconnect the voltmeter.

If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies

sales office, representative, or ASI. In the United States, call 1–800–800–2726. Furnish the Serial No., Bill of

Material (BOM) No., and Catalog No. from transfer switch nameplate.

SECTION 4 ADJUSTMENTS

4 --- 1

Time Delay Adjustment

Standard time delays are set to customer specifications

(if none specified, standard factory settings are used).

To change a setting, follow procedure on page 4-2. Use

Table 4-1 as a guide to time delay values and their cor-

responding adjustment DIP switch or potentiometer.

Table4-1.TimeDelaySettings

DESCRIPTION LABELS FACTORY

SETTING

ADJUSTMENT

RANGE

S3 DIP

SWITCH

ADJUSTMENT

POTENTIOMETER

Override Momentar

y

T

D

E

S

3

s

e

c

o

n

d

s

1second Actuator 1 on

1

O

v

e

r

r

i

d

e

M

o

m

e

n

t

a

r

y

Normal Source Outages

T

D

E

S

3secon

d

s3seconds Actuator 1 off

1

—

T

r

a

n

s

f

e

r

t

o

E

m

e

r

g

e

n

c

y

TIMER 0 minutes 0to5

P

2

T

rans

f

er to

E

mergency

T

I

M

E

R

N

/

E

0

m

i

n

u

t

e

s

(full ccw)

0

t

o

5

minutes

—

—

P

2

Override Momentary

Emergency S. Outages —4seconds non-adjustable — — —

R

e

t

r

a

n

s

f

e

r

t

o

N

o

r

m

a

l

TIMER 30 minutes 1secondto

P

1

R

etrans

f

er to

N

orma

l

T

I

M

E

R

E

/

N

3

0

m

i

n

u

t

e

s

(full cw)

1

s

e

c

o

n

d

t

o

30 minutes

—

—

P

1

Unloaded Running

(Engine Cooldown) —5 minutes non-adjustable — — —

Sensor Adjustments

Voltage and frequency sensor pickup and dropout points

are set to customer specifications (if none specified,

standard factory settings are used). To change a setting,

follow procedure on page 4–2. Use Tables 4-2 and 4–3

for settings and corresponding DIP switch actuators.

NOTICE

Any change in these settings may affect the

normal operation of the automatic transfer

switch. This change could allow the load circuits

to remain connected to a low voltage source.

Table 4-2. Voltage and Frequency Settings. ( Shaded DIP switches are standard factory settings).

D

E

S

C

R

I

P

T

I

O

N

L

A

B

E

L

S

S

E

T

T

I

N

G

%ofnominal S1 DIP

D

E

S

C

R

I

P

T

I

O

N

L

A

B

E

L

S

S

E

T

T

I

N

G

FACT. SET ADJ RANGE

S

1

D

I

P

SWITCH

P

U

/

N

P

i

c

k

u

p

9

0

%

95 % * Actuator 3 off

3

P

U

/

N

P

i

c

k

up 90 % 90 % Actuator 3 on

3

90 % * Actuator 1 off

Actuator 2 off

21

Normal Source Voltage

D

O

/

N

D

r

o

p

o

u

t

8

5

%

85 % Actuator 1 on

Actuator 2 off

21

DO

/

NDropout 85 %

80 % Actuator 1 off

Actuator 2 on

21

70 % Actuator 1 on

Actuator 2 on

21

Emer

g

enc

y

Source –– Pickup 90 % non-adjustable

E

m

e

r

g

e

n

c

y

S

o

u

r

c

e

Voltage –– Dropout 75 % non-adjustable ––

–– Pickup 95 % non-adjustable

E

m

e

r

g

e

n

c

y

S

o

u

r

c

e

–– Dropout 85 % non-adjustable ––

Emergency Source

Frequency 60

/

50

6

0

/

5

0

H

z

6

0

H

z

60 Hz Actuator 4 off

4

e

q

u

e

c

y

6

0

/

5

0

Hz 60

/

50

H

z60

H

z50 Hz Actuator 4 on

4

V

o

l

t

a

g

e

P

h

a

s

e

s

3

1

3

/

1

3

3phase Actuator 6 off

6

V

o

l

tage

P

h

ases 3, 1 3

/

1 3 1phase Actuator 6 on

6

* If dropout voltage is set to 90%, the pickup voltage must be set to 95%.

Table 4-3. Transformer Voltage Adjust.

(Low setting shifts all voltage settings down 4.2%; for example, 240 V to 230 V, or 480 V to 460 V)

DESCRIPTION LABELS FACTORY SETTING ADJUSTMENT S3 DIP SWITCH

V

o

l

t

a

g

e

A

d

j

u

s

t

(

4

2

%

)

L

OW

/

H

I

LOW Actuator 2 off

2

V

o

l

tage

A

d

j

ust

(

4.2%

)

L

O

W

/

HI

H

I

HI Actuator 2 on

2

ADJUSTMENTS (continued)

4 --- 2

NOTICE

Do not make any setting changes while the

controller is energized.

How to Change a Setting

1. Prevent the transfer switch from operating by discon-

necting one source first, then the other, as follows:

a. If the transfer switch is in the Normal position,

open the emergency source circuit breaker.

Turn the engine starting control to off.Then

open the normal source circuit breaker.

b. If the transfer switch is in the Emergency

position, open the normal source circuit breaker.

Turn engine starting control to test or run.Then

open the emergency source circuit breaker.

2. Disconnect both harness plugs from controller by

squeezing the latches. Do not pull on the wires.

3. Remove cover from the controller by releasing latch

on right side with your thumb. See Figure 4-1.

4. Locate the appropriate adjustment potentiometer or

DIP switch for the setting that you want to change.

Refer to Table 4-1 and Table 4–2 on page 4-1 and

Figure 4-2, Figure 4–3, Figure 4–4 on page 4–2.

5. Use a small screwdriver to turn the potentiometer

clockwise to increase the time delay or counter-

clockwisetodecreaseit. SeeFigure4-3.

6. Use a ball-point pen (or similar pointed tool) to slide

the switch actuators left or right so they match the

illustration next to the setting (left = off, right =

on). Recheck the setting. See Figure 4-4.

7. Install the cover on the controller by hooking it on

the left side and latching the right side.

8. Reconnect both harness plugs to the controller by

aligning and pressing straight in until latches click.

Close the transfer switch enclosure door.

9. Close the enclosure door, then restore both sources:

a. If the transfer switch is in the Normal position

first close the normal source circuit breaker, then

close the emergency source circuit breaker.

b. If the transfer switch is in the Emergency

position, close the normal source circuit

breaker. Theloadwillbeautomatically

retransferred to the normal source. Then close

the emergency source circuit breaker.

10. Turn the engine starting control to automatic.

thumb

latch

cover

hook on

left side

Figure 4-1. Controller cover latch.

9volt

alkaline

battery

battery

on/off

jumper

retransfer

to normal

time delay

transfer to

emergency

time delay

harness

plugs

S3 DIP

switch

S1 DIP

switch

S2 DIP

switch

P1

P2

J5

Figure 4-2. Location of potentiometers.

P1 or P2

potentiometer

clockwise to

increase

counterclockwise

to decrease

Figure 4-3. Changing time delay potentiometers.

DIP

switches

SW1

SW2

SW3 actuator

onoff

(8 on each DIP switch)

Figure 4-4. Setting DIP switch actuators.

SECTION 5 CONTROL FEATURES – ENGINE EXERCISERS

5 --- 1

These timers periodically exercise the emergency engine-generator plant. They can be set to exercise with or without

load transfer, or they can be completely disabled. The engine-generator should be exercised under load once a week for

a minimum time period of 20 minutes, or follow the recommendations of the engine-generator set manufacturer. Refer

to page 4–2 for location of DIP switches, battery (provided), and jumper block in the controller.

BUILT–IN ENGINE EXERCISER

The engine exerciser included in ASCO Series 300

Automatic Transfer Switches provides a once a week

20–minute exercise period. It occurs immediately when

the Set Engine Exerciser push button is pressed (and

held for at least 5 seconds), and then at the same time

weekly thereafter. A 9 volt alkaline battery (Duracell

MN1604, Everready 522, or Panasonic 6AM6) is

furnished and installed in the controller to maintain the

setting. The battery jumper block must be shifted to the

ON position. See Figure 4–2 on page 4–2.

Fill in day and time set. Week Day ______ Time _______.

DIP Switch Settings

FUNCTION S1 DIP

SWITCH

S2 DIP

SWITCH

Std. Timer

Enabled

Actuator

7on

7

Actuator

5on

5

Std. Timer

Disabled

Actuator

7off

7

Actuator

5on

5

Exercise

without

Load

Actuator

8off

8

Exercise

with Load

Actuator

8on

8

Shaded DIP switches are standard factory settings.

status light

If Exerciser with Load is set,

transfers load to Emergency.

If Exercise with Load is set, retransfers load to

Normal, then stops generator after min. cooldown.

Press to cancel an active exercise

period (stops generator). Press and hold for 5 sec. or until status light

blinks rapidly to set exercise period immediately

and every week hereafter (generator starts).

Figure 5-1. Operator panel pushbuttons and light.

Select below either Exercise without Load or Exercise with Load according to the setting of DIP switch S1, actuator 8. The

load transfers from the Normal source to Emergency source (generator) and back again if Exercise with Load is selected.

Exercise without Load, DIP Switch S1, Actuator 8 off

8

How to Set Built–In Timer

Step Function Explanation

Push Button Status Light

1

Set Engine

Exerciser

hold 5sec.

blinks rapidly

OPOPOP set exercise period Exercise the generator now and

every week at this time hereafter.

2release blinks slowly

OPPOPP exercise period now active Generator starts and runs.

3press Bypass

Time Delay Ostays on cancel active exercise period Generator stops.

4 — Ostays on generator off Exerciser enabled; repeats every 7 days.

Exercise with Load, DIP Switch S1, Actuator 8 on

8

How to Set Built–In Timer

Step Function Explanation

Push Button Status Light

1

Set Engine

Exerciser

hold 5sec.

blinks rapidly

OPOPOP set exercise period Exercise the generator now and

every week at this time hereafter.

2release blinks slowly

OPPOPP exercise period now active Generator starts and runs;

the load transfers to Emergency.

3press Bypass

Time Delay

blinks slowly

OPPOPP cancel active exercise period

The load retransfers to Normal; then

generator runs for 5 minute cooldown

( light blinks slowly during cooldown ).

4 — Ostays on generator off Exerciser enabled; repeats every 7 days.

NOTE:EverytimeSET ENGINE EXERCISER push button is pressed (held 5 seconds) the exercise period is changed.

CONTROL FEATURES (continued)

5 --- 2

Optional Accessory 11BG – SOURCE AVAILABILITY SIGNAL

& PROGRAMMABLE ENGINE EXERCISER MODULE

2–line

display

3 buttons

connections

for source

availability

signal contacts

Figure 5–2. Accessory 11BG module (mounted behind operator interface and connected to the controller)

includes source availability signal contacts and a programmable engine exerciser.

Source Availability Signal Contacts

ThemoduleprovidesoneFormCcontacteachforthe

normal and emergency sources signal the acceptability

of the source as sensed by the controller. The signal

contacts operate in conjunction with the Source

Accepted lights on the operator interface. Field wiring

terminals are provided as shown in Figure 5–3 and the

wiring diagram.

Contact ratings:

2 amps @ 30 Vdc, 0.5 amp. @ 125 Vac resistive

SOURCE

AVAILABILITY SIGNALS

2 AMPS @ 30 VDC, resistive

0.5 AMP @ 125 VAC, resistive

contacts shown de–energized

Figure 5–3. Source availability signal contacts.

ProgrammableEngineExerciser

Themoduleincludesaprogrammableengineexerciser

that provides for weekly or biweekly operation. This

optional exercise timer may have to be turned on

(enabled) by setting the S1 DIP switch actuator 7 to off,

and S2 DIP switch actuator 5 to off. A backup battery in

the controller (see page 4–2 and page 5–3) must be

turned on to maintain the settings and to allow

programming with the normal and emergency power

turned off (page 5–1).

Theprogrammableengineexerciserincorporatesa7

day or 14 day time base. Proper controller settings must

be made to determine whether or not the test will be

done with or without load transfer (S1 DIP switch

actuator 8).

Seenextpageforinstructionsonsettingthetimer.

DIP Switch Settings in the Controller

(see page 4–2)

FUNCTION S1 DIP

SWITCH

S2 DIP

SWITCH

Opt. Timer

Enabled

Actuator

7off

7

Actuator

5off

5

Opt. Timer

Disabled

Actuator

7off

7

Actuator

5on

5

Exercise

without

Load

Actuator

8off

8

Exercise

with

Load

Actuator

8on

8

Shaded DIP switches are standard factory settings.

Fast/Slow Adjust

Daylight Saving

Time Adjust

Date

Time

Start TIme

Engine Exerciser

Run TIme

CONTROL FEATURES (continued)

5 --- 3

How to Set Optional Programmable Engine Exerciser (part of Acc. 11BG module)

Hazardous voltage capable of causing shock,

burns, or death is used in this transfer switch.

Deenergize both Normal and Emergency power

sources before programming the exerciser.

Navigating the Menu

Use the UP and DOWN arrow

keys to move through the displays.

Changing the Parameters

Use the UP and DOWN arrow

keys to move though the displays

to the parameter to be changed.

Push the ENTER key to start the

editing process. The first

parameter will flash. Use the UP

and DOWN arrow keys to adjust

the parameter to the desired

value and press the ENTER key

to save the value. The next

parameter will now flash. Repeat

the process until each parameter

is properly configured.

Engine Exerciser Display

TheEngineExerciserDisplayshowsthestatusofthe

engine exerciser. When the unit is shipped from the

factory the programmable engine exerciser is

“Disabled” and must be set to “Enabled” by the

customer. When the engine exerciser is running, this

display will count down the remaining time until the

end of the exercise period.

Start Time Display

TheStartTimeDisplayshowstheengineexerciserstart

time. There are four parameters that determine the start

time:

weekly (”Every”) or bi–weekly (”Alt”) operation

day of week (”Sun” through “Sat”)

start hour (0 through 23)

start minutes (0 through 59)

For example, if the user wants the exerciser to run every

other Saturday at 3 PM, the proper configuration would

be: “Alt Sat @ 15:00”

NOTE: When choosing bi–weekly operation, the

exerciser will always run on the week designated “(1)”

onthedatedisplay.

Run Time Display

The Run Time Display shows the run time for the engine

exerciser. The default setting from the factory is 30 min.

Time Display

The Time Display shows the present system time. The

format is “hours:minutes:seconds”.

NOTE: During total power outages, power to the

accessory is maintained by a battery in the Controller

(see page 4–2). Be sure that the 9–volt alkaline battery

is fresh and enabled (jumper in ON position) so that

the time and date settings are not lost.

Date Display

The Date Display shows the present system date. The

format is “day of week (week) month/day of

month/year”.

NOTE: Week is either week 1 or week 2. This is used

in conjunction with the bi–weekly timer.

Daylight Savings Time Adjust Display

This display shows whether the automatic daylight

saving time adjustment is active. The factory default is

“NO”. If enabled, the unit will automatically adjust for

daylight saving time at 2 AM on Sunday as follows:

Part No. 629857–001* 629857–002*

Start first Sunday in April 2nd Sunday in March

Stop last Sunday in Oct first Sunday in Nov

* Part no. on back of circuit board. New DST starts in 2007.

Fast / Slow Adjust Display

This display shows the automatic fast/slow adjustment

value. Thefactorydefaultis0. Thisfeaturecanbe

used to trim a clock that runs fast or slow. For example,

if your clock runs 10 seconds slow per week, change the

fast/slow adjust value to “+10” and the unit will

automatically add 10 seconds to the clock every week.

NOTE: Adjustments are made Sunday morning at 2

AM. If you want your exerciser period to start at 2 AM

on Sunday, you cannot use this feature and the

adjustment must be set to 0.

Date exerciser was set ___________________________

Fill in your settings for future reference

Weekly or Bi–weekly Day of Week Start Time Run Time

Every = weekly

Alt = bi–weekly Sun through Sat 0–23hour

0–59minute

0–23hour

0–59minute

30 min. is default setting

CONTROL FEATURES (continued)

5 --- 4

INPHASE MONITOR

FOR MOTOR LOAD TRANSFER

Inphase monitoring logic controls transfer and

retransfer of motor loads, so that inrush currents do not

exceed normal starting currents. It avoids nuisance

tripping of circuit breakers and mechanical damage to

motor couplings.

The Motor Load Transfer feature is built into the

controller. DIP switch S1 (actuator 5) activates this

feature: right = ON, left = OFF.

FUNCTION S1 DIP SWITCH

enable Actuator 5 on

5

disable Actuator 5 off

5

Shaded DIP switches are standard factory settings.

If the Motor Load Transfer feature is enabled, it

will be activated following the Load Disconnect

Feature Delay Before Transfer delay.

Note

LOAD DISCONNECT FEATURE

Connect external circuits to the terminals indicated on

the Wiring Diagram provided with the ATS.

The double throw (Form C) contact is rated for

28 VDC or 120 VAC (5 amperes resistive). The contact

operates prior to a selectable 0, 3, 10, or 20 second

delay before transfer of the Automatic Transfer Switch.

The contact resets either immediately following transfer

or after the same delay as set for pre–signal before

transfer.

Time delay between the load disconnect control signal

and initiation of transfer is set on the controller with

DIP switch S2 (actuators 6, 7, 8) as shown below:

Delay Before Transfer

LD TDBT S2 DIP SWITCH

0 (disable) Actuator 7 on

Actuator 8 on

87

3seconds Actuator 7 on

Actuator 8 off

87

10 seconds Actuator 7 off

Actuator 8 on

87

20 seconds Actuator 7 off

Actuator 8 off

87

Shaded DIP switches are standard factory settings.

Delay After Transfer*

LD TDAT S2 DIP SWITCH

enable Actuator 6 on

6

disable Actuator 6 off

6

*Enabling the Delay After Transfer will cause the

control signal to reset after the same delay as set for the

Delay Before Transfer.

REMOTE CONTROL FEATURES

These remote control features require a customer–supplied normally closed contact suitable for a 5 V dc low energy

circuit. Refer to the Wiring Diagram provided with the ATS. Activate appropriate DIP switch S2 actuators below.

Remote Test (terminals CP6–7)

RTSW S2 DIP SWITCH

disable Actuator 3 on

3

enable Actuator 3 off

3

Bypass Transfer Time Delay (CP12–13)

TD E/N BYP. S2 DIP SWITCH

disable Actuator 1 on

1

enable Actuator 1 off

1

Remote Transfer to Emergency (CP8–9)

RT /E S2 DIP SWITCH

disable Actuator 2 on

2

enable Actuator 2 off

2

Inhibit Transfer to Emergency (CP10–11)

N/E INHIB. S2 DIP SWITCH

disable Actuator 4 on

4

enable Actuator 4 off

4

CONTROL FEATURES (continued)

5 --- 5

OPTIONAL STRIP HEATER (Accessory 44)

Accessory 44 Strip Heater is designed to keep ambient

temperatures within the Automatic Transfer Switch

enclosure at acceptable levels. This accessory consists

of a mounting bracket with strip heater, thermostat, and

terminal block. A transformer with fuses is included

when the power for the assembly is derived from

voltages above 120 V ac. The 120 V ac customer

powered assembly does not include a transformer. This

optional accessory is available factory installed or in kit

form.

Turn the thermostat’s dial to required setting as shown.

dial

turn counterclockwise

to lower temperature

turn clockwise

to raise temperature

thermostat

Figure 5–4. Thermostat.

AVAILABLE KITS

Controls

Description Accessory Kit

ProgrammableEngineExerciser

& Source Availability Contacts

11BG K629830

Serial Communication Module 72A K601110

Strip Heater – Accessory 44

Description Accessory Kit

120 volt

customer supplied voltage

(without transformer)

44A K613127–001

208 – 480 volt

ATS derived voltage

(with transformer)

44G K613127–002

380 volt

ATS derived voltage

(with transformer)

44G K613127

550 – 600 volt

ATS derived voltage

(with transformer)

44G K613127–003

INDEX

Printed in U.S.A. Copyright --- ASCO Power Technologies, L.P. 2011

A

accessories, 5–2, 5–5

auxiliary circuits, 1–2

B

battery, 4–2, 5–1

buttons, push, 3–1

bypass time delay, 1–5, 2–1, 3–1

C

cable

lugs, 1–1

preparation, 1–1

catalog number, inside cover

cleaning, 3–1

connections

engine control contact, 1–2

line, 1–1

contact position indicators, 1–3

contacts

auxiliary, 1–2

engine control, 1–2

main, 1–3, 3–1

source availability signal, 5–2

control features, 5–1

load disconnect, 5–4

motor load transfer, 5–4

plant exerciser, 5–1, 5–2, 5–3

controller, 4–1, 4–2

codes, cover

cover removal, 4–2

disconnecting, 3–1

time delay potentiometers, 4–2

D

DIP Switches, 4–1, 4–2, 5–1, 5–2, 5–4

E

electrical operation, 1–5

engine exerciser, 5–1, 5–2, 5–3

engine starting contacts, 1–2

F

features, see control features

frequency, pickup and dropout

settings, 4–1

functional test, 1–3, 1–4, 1–5

G

ground, controller, 1–1

H

handle, maintenance, 1–3

warning, 1–3

harness, 1–2

disconnect plugs, 3–1

HELP

800–800–2726 (ASCO)

customercare@asco.com

I

inphase monitor, 5–4

inspection, 3–1

installation, 1–1

L

labels,

engine starting contacts, 1–2

inputs / outputs, 1–2

rating, cover

lights, 1–4, 5–1

load disconnect feature, 5–4

lubrication, 3–1

M

maintenance, preventive, 3–1

manual load transfer, 3–2

warning, 3–2

manual operation, 1–3

warning, 1–3

motorloadtransferfeature,5–4

N

nameplate, cover

O

operation

electrical, 1–5

manual, 1–3

illustration of, 1–3

warning, 1–3

sequence of, 2–1

optional accessories

programmableengineexerciser

& source availability signal

contacts, 5–2, 5–3

serial communication module, 5–5

strip heater, 5–5

P

parts, 3–1

problem, 3–2

programmable engine exerciser, 5–2,

5–3

R

rating label, cover

remote control features, 5–4

bypass transfer time delay, 5–4

inhibit transfer to emergency, 5–4

remote test, 5–4

remote transfer to emergency, 5–4

replacement parts, 3–1

S

service, call 800–800–2726 (ASCO)

set engine exerciser, 5–1, 5–2, 5–3

settings

changing, 4–1

factory, 4–1

frequency, 4–1

phase, 4–1

time delay, 4–1

voltage, 4–1

source accepted lights, 1–4, 1–5

T

terminal block, 1–2

test, functional, 1–3, 1–4, 1–5

time delay

adjustment, 4–1

gen–set cooldown, 4–1

how to change, 4–2

override momentary outages, 4–1

transfer to emergency, 4–1

transfer to normal, 4–1

timer (plant exerciser), how to set,

5–1, 5–2, 5–3

transfer switch position lights, 1–4,

1–5

transfer test, 1–5, 3–1

trouble–shooting, 3–2

V

voltage, phase, 4–1

voltage, pickup and dropout settings,

4–1