962 0134OM 0134 Onan RSS100 RSS200 Transfer Switch Operator's Manual (08 2007)

User Manual: 962-0134 Onan RSS100 RSS200 Transfer Switch Operator's manual (08-2007)

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Operator Manual

Transfer Switch
RSS100 and RSS200

English

8-2007

962−0134

Table of Contents
SECTION

TITLE

PAGE

SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
1.

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Switch Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
1-1
1-1

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Switch With Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ATS Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Membrane Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Time Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Delay Engine Start (TDES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Delay Engine Cooldown (TDEC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Delay Normal to Emergency (TDNE) (Transfer) . . . . . . . . . . . . . . . . . . . . . .
Time Delay Emergency to Normal (TDEN) (Retransfer) . . . . . . . . . . . . . . . . . . . .

2-1
2-1
2-1
2-1
2-3
2-3
2-3
2-3
2-3

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Switches with an Operator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Complete System Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator Exerciser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting An Exercise Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canceling Repeat Exercise Periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canceling An Active Exercise Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Source Failure During An Active Exercise Period . . . . . . . . . . . . . . . . . . .

3-1
3-1
3-2
3-2
3-3
3-3
3-3
3-3
3-3

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Panel LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting the Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Obtain Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1
4-1
4-3
4-6

Safety Precautions
This manual includes the following symbols to indicate potentially dangerous conditions. Read the
manual carefully and know when these conditions
exist. Then take the necessary steps to protect personnel and the equipment.

the transfer switch must be performed only by a
trained and experienced electrician or an authorized Cummins Onan service representative.
If the cabinet must be opened for any reason:
1. Disconnect the AC utility power from the transfer switch by opening the circuit breaker in the
main panel that feeds the transfer switch.

This symbol warns of immediate
hazards that will result in severe personal injury
or death.
DANGER

2. Move the operation selector switch on the generator set to Stop/Off.

WARNING This symbol refers to a hazard or
unsafe practice that can result in severe personal injury or death.

3. Disconnect the negative (−) cable from the
generator set starting batteries.

CAUTION This symbol refers to a hazard or
unsafe practice that can result in personal injury or product or property damage.

GENERAL PRECAUTIONS
Place rubber insulative mats or dry wood platforms
over metal or concrete floors when working on any
electrical equipment. Do not wear damp clothing
(particularly wet shoes) or allow skin surfaces to be
damp when handling any electrical equipment.
Jewelry is a good conductor of electricity and
should be removed when working on the electrical
equipment.
Wear safety glasses whenever servicing the transfer switch.
Do not smoke near the batteries.
Do not work on this equipment when mentally or
physically fatigued, or after consuming alcohol or
any drug.

ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH
High voltage in transfer switch components presents serious shock hazards that can result in severe
personal injury or death. Read and follow these instructions.
Keep the transfer switch cabinet cover secured with
the provided mounting hardware. Only authorized
personnel are allowed to access the inside of the
cabinet.
Due to the serious shock hazard from high voltages
within the cabinet, all service and adjustments to

WARNING

INCORRECT SERVICE OR REPLACEMENT OF PARTS CAN RESULT IN
DEATH, SEVERE PERSONAL INJURY, AND/OR EQUIPMENT DAMAGE. SERVICE PERSONNEL MUST BE TRAINED AND EXPERIENCED TO PERFORM
ELECTRICAL AND/OR MECHANICAL SERVICE.

RSS-1

1. Introduction
ABOUT THIS MANUAL

TRANSFER SWITCH FUNCTION

This manual covers transfer switch models produced under the Cummins® Power Generation
brand name. This manual provides information necessary for operation of an RSS transfer switch with
a control.

Transfer switches are an essential part of a standby
power system. The utility (normal power source) is
backed up by a generator (emergency power
source). Should the utility fail, the transfer switch
automatically switches the electrical load from the
utility to the generator. When utility power returns,
the transfer switch automatically switches the electrical load back to the utility.

The RSS transfer switch with a control includes an
operator panel located behind the hinged panel in
the upper left hand corner on the front of the enclosure, as shown in Figure 1-1.

Automatic transfer switches, capable of automatic
operation without operator intervention, perform the
basic function of transferring the load to the available power source. A controller monitors each
source for allowable voltage and frequency range.
THE OPERATOR
PANEL IS LOCATED
BEHIND THE
HINGED COVER

The transfer switch performs the following functions:
1. Senses the interruption of utility power.
2. Sends a start signal to the generator.
3. Senses generator power is available.
4. Transfers the load to the generator.
5. Senses the return of utility power.
6. Retransfers the load to the utility.
7. Sends a stop signal to the generator.

FIGURE 1-1. RSS TRANSFER SWITCH

1-1

THIS PAGE LEFT INTENTIONALLY BLANK

1-2

2. Description
Generator Power Connected − This amber LED is
lit when the transfer switch is connected to the generator set which is supplying power to the load.

This section describes how the basic components
of a transfer switch function.

TRANSFER SWITCH WITH CONTROL

If this LED is flashing it means the transfer switch
has failed to connect to or disconnect from the generator set, when commanded by the control.

Figure 2-1 shows the operator panel used with
transfer switches with a control. The panel’s features are divided into two groups:

Test − This amber LED is lit when there is an active
test period. It flashes twice per second when the
Test pushbutton is pressed to set or cancel a test
period.

S ATS Status LEDs
S Membrane Pushbuttons

Exercise − This amber LED is lit when repeat exercise periods are set. It flashes twice per second
when the Set Exercise pushbutton is pressed to set
or cancel an exercise. It flashes once per second
during an active exercise period.

ATS Status LEDs
The operator panel includes six LEDs that provide
Automatic Transfer Switch (ATS) status information.

Membrane Pushbuttons

Utility Power Available − This green LED is lit
when the utility power source has acceptable output
voltage.

The operator panel includes three membrane pushbuttons.
Test − The Test pushbutton is used to start or cancel
a test period.

Generator Power Available − This amber LED is lit
when the Generator power source has acceptable
output voltage and frequency.

Override − The Override pushbutton is used to terminate or bypass some time delays, to stop the
Power Connected LEDs from flashing as a result of
a failure to connect to or disconnect from a power
source, and to cancel an active exercise period.

Both power source LEDs can be lit simultaneously.
Utility Power Connected − This green LED is lit
when the transfer switxh is connected to utility power which is supplying power to the load.

Set Exercise − The Set Exercise pushbutton is
used to enable or disable repeatable exercise periods using the exerciser. The exerciser is built into
the controller. The exercise period runs for 20 minutes and it repeats every 28 days when an exercise
is enabled.

If this LED is flashing, it means that the transfer
switch has failed to connect to or disconnect from
utility power, when commanded by the control.

2-1

TEST
ACTIVITY LED

GENERATOR POWER
AVAILABLE LED

PowerCommand

UTILITY
POWER
AVAILABLE
LED

Test

Control operation could be delayed by external source.

Exercise

Test

Override Set Generator

TEST
PUSHBUTTON
UTILITY
POWER
CONNECTED
LED

Exercise

GENERATOR
POWER
CONNECTED
LED

SET EXERCISE
PUSHBUTTON
ACTIVE SET OR
OVERRIDE
PROGRAMMED
PUSHBUTTON
EXERCISE LED

FIGURE 2-1. CABINET DOOR (SHOWN WITHOUT HINGED COVER)

2-2

CONTROL TIME DELAYS

Time Delay Normal to Emergency (TDNE)
(Transfer)

For transfer switches with an operator panel, the
transfer switch control uses various time delays to
break from one power source and connect to the
other source.

This time delay allows the generator set to stabilize
before the load is applied.
While connected to the utility, this time delay starts
after utility power fails and the generator set becomes available (the amber Generator Power
Available LED is lit). This time delay also starts after
the generator set becomes available when a with
load Test or Exercise period is activated.

In the following descriptions of time delays, it is important to remember that:
S When the transfer switch is connected to the
Normal side, it is connected to the Utility
power source.

The time delay is set to 5 seconds. If the generator
set fails any time during a TDNE, the control resets
the timer and restarts it once the generator set is
again available.

S When the transfer switch is connected to the
Emergency side, it is connected to the Generator power source.

If the Override pushbutton is pressed while the
TDNE timer is active, the TDNE is terminated immediately and the control transfers the load to the generator set.

Time Delay Engine Start (TDES)
This time delay prevents the generator set from
starting during brief utility power interruptions. This
timer starts the instant the utility fails, as detected by
the Undervoltage Sensor.

Time Delay Emergency to Normal (TDEN)
(Retransfer)

When the control senses a utility failure, the control
starts the Time Delay Engine Start (TDES) timer.
This time delay is set to 3 seconds.

While connected to Generator power, this time
delay allows utility power to stabilize before the load
is transferred back (retransferred) to the utility. This
delay also allows the generator set to operate under
load for a minimum amount of time before transferring the load back to utility power.

If utility power returns while the TDES timer is active, the timer is reset. When the timer expires, the
control signals the generator set to start. The timer
is not reset until utility power returns. If the Override
pushbutton is pressed while the TDES timer is active, the TDES timer is immediately terminated and
the control signals the generator set to start.

This time delay starts with the transfer switch connected to the generator set and after the utility becomes available following an outage (The green
Utility Power Available LED is lit). This time delay
also starts when an active Test or Exercise period is
ended. After the delay, the transfer switch can retransfer the load to the utility power source.

Time Delay Engine Cooldown (TDEC)
This time delay allows the generator set to cool down
(under no load conditions) after the switch returns to
utility power.
The Time Delay Engine Cooldown (TDEC) starts
timing when the load is retransferred to utility power.
This time delay is set to 10 minutes.

The time delay is set to 10 minutes. If the utility fails
any time during this time delay, the control resets
the timer and restarts it once utility power becomes
available. If the generator set fails at any time during
this time delay while power is available, the timer
expires and the normal retransfer sequence takes
place.

When the TDES expires, the stop signal is sent to
the generator’s control to shut down the generator
and the timer is reset. Pressing the Override pushbutton has no effect on this time delay.

If the Override pushbutton is pressed while the
TDEN timer is active, the TDEN timer is terminated
immediately and the transfer switch retransfers the
load back to the utility.

2-3

THIS PAGE LEFT INTENTIONALLY BLANK

2-4

3. Operation

PowerCommand

Transfer Switch

Test

Control operation could be delayed by external source.

Exercise

Test

Override Set Exercise

FIGURE 3-1. CONTROL PANEL

TRANSFER SWITCHES WITH AN
OPERATOR PANEL

SCREW TO
BE REMOVED

The transfer switch provides three operator pushbuttons and six LEDs that indicate operation status.
PANEL COVER

To access the operator panel, remove the screw securing the panel cover and open the cover (see Figure 3-2).

FIGURE 3-2. OPERATOR PANEL COVER

3-1

OVERRIDE

To complete a system and periodic test,
1. Switch the main circuit breaker from the “ON”
to the “OFF” position.

The Override pushbutton is used to:
S Terminate the following system time delays:

2. Make sure the following occurs.

− Time Delay Engine Start (TDES)

a. The generator control receives a signal to
start the generator set.

− Time Delay Normal to Emergency (TDNE)
− Time Delay Emergency to Normal (TDEN)

b. After the generator set starts and the TDNE
expires, the load is transferred from the utility to the generator set.

S Stop the Utility Power Connected LED from
flashing as a result of a failure to connect to
or disconnect from the utility when commanded.

3. Switch the main circuit breaker from the “OFF”
to the “ON” position.

S Stop the Generator Power Connected LED
from flashing as a result of a failure to connect to or disconnect from the generator set
when commanded.

4. Make sure the following occurs.
a. After a 10-minute TDEN time delay, the load
is transferred back to the utility.

S Cancel an active exercise period.

b. Once the transfer switch is connected to utility power, the generator set receives a signal to cool down the generator set.

The engine cooldown (TDEC) time delay is not affected by pressing this pushbutton.

c. After a 10-minutes TDEC time delay, the
generator set stops.

COMPLETE SYSTEM TEST
A complete system test is recommended to verify
that the electrical system is working properly. Testing the system once every three months is required
to make sure the transfer switch will transfer the
load to the generator set, should there be a utility
power failure.

NOTE: When ending a test, you can bypass the retransfer time delay (TDEN) and cause the
immediate load retransfer by pressing the
Override button. The generator set stops after the engine cooldown time delay (TDEC).

3-2

GENERATOR EXERCISER

3. To start an immediate exercise period and
have it repeat, press and hold the Set Exercise
pushbutton for 5 seconds. The Exercise LED
flashes at a rate of twice per second for 5 seconds and then stays on. Momentarily press the
Set Exercise pushbutton a second time within
ten seconds and an exercise period will start
immediately. Momentarily pressing and releasing the Set Exercise pushbutton a second time
starts an immediate 20 minute exercise period
instead of waiting for 12 hours. The Exercise
LED flashes at a rate of once per second during
the exercise period. When the exercise period
is over, the Exercise LED stops flashing and remains on to signify that repeat exercise periods
are enabled.

The generator set should be run at least once every
28 days to make sure it operates properly. The exerciser will automatically start the generator set and
let it run for 20 minutes once every 28 days. The automatic exercise is set by pressing the Set Exercise
pushbutton.

Setting An Exercise Period
The operator has to be present at the transfer
switch to set the start time of the exercise. There are
two ways to start an exercise period. It can be set to
start immediately and repeat at this time every 28
days or it can be set to start 12 hours from now and
repeat at that time every 28 days.

4. Record the exercise start time for future reference.

There is a 12-hour offset feature so that the operator does not have to be present at an inconvenient
time. For example, you can set the exercise at 3:00
PM so that it will start at 3:00 AM.

Canceling Repeat Exercise Periods

Step 2 below shows how to set the 12-hour offset
and step 3 below shows how to set an immediate
exercise period.

With the control panel Exercise LED on steady,
press and hold the Set Exercise pushbutton for 5
seconds. The Exercise LED flashes at a rate of
twice per second for 5 seconds and then goes out to
signify that repeat exercise periods are cancelled.

1. Verify that the Exercise LED is off.
2. To set and exercise period that will start 12
hours from now and repeat every 28 days
from that time, press and hold the Set Exercise
pushbutton for 5 seconds. The Exercise LED
flashes at a rate of twice per second for 5 seconds and then stays on when the exercise period is set. A delayed 20 minute exercise period
will start in 12 hours. The Exercise LED flashes
at a rate of once per second during the exercise
period. When the exercise period is over, the
Exercise LED quits flashing and remains on to
signify that repeat exercise periods are enabled.

Canceling An Active Exercise Period
Active exercise periods can be canceled by pressing the Override pushbutton on the control panel.

Power Source Failure During An Active
Exercise Period
If either power source fails during an active exercise
period, the control immediately terminates the exercise and proceeds with the automatic mode of operation.

3-3

THIS PAGE LEFT INTENTIONALLY BLANK

3-4

4. Troubleshooting
OPERATOR PANEL LED INDICATORS

This section includes a description of the control
LED indicators and provides preliminary troubleshooting checks.

TEST
ACTIVITY
LED

The operator panel contains six LED indicators that
provide some information about the current control
status and may be helpful in troubleshooting the
transfer switch (see Figure 4-1). Descriptions of
these indicators are included in Table 4-1.

PowerCommand

Test

UTILITY
POWER
AVAILABLE
LED

TEST
PUSHBUTTON

GENERATOR
POWER
AVAILABLE
LED

Control operation could be delayed by external source.

Exercise

Test

UTILITY POWER
CONNECTED LED

GENERATOR
POWER
CONNECTED
LED

Override Set Generator
Exercise

OVERRIDE
PUSHBUTTON

SET EXERCISE
PUSHBUTTON

ACTIVE SET OR
PROGRAMMED
EXERCISE LED

FIGURE 4-1. CONTROL PANEL

4-1

TABLE 4-1. OPERATOR PANEL LED INDICATORS
Definition

Indicator
Utility Power Available
Utility Connected

Generator Power Available
Generator Connected

Exercise

This indicator lights when the utility source voltage sensor has determined that Utility
power is available and is within acceptable voltage limits.
1. Lights constantly when the transfer switch is connected to the Utility.
2. Blinks once per second when the transfer switch has failed to connect to or
disconnect from the Utility when commanded.
3. Is off when the transfer switch is not connected to the Utility.
This indicator lights when the generator source voltage sensor has determined that
generator power is within acceptable voltage and frequency limits.
1. Lights constantly when the transfer switch is connected to the Generator.
2. Blinks once per second when the transfer switch has failed to connect to or
disconnect from the Generator when commanded.
3. Is off when the transfer switch is not connected to the Generator.
The following describes the Exercise LED when an exercise is enabled.
1. Lights constantly when repeat exercise periods have been set.
2. Blinks twice per second when the Set Exercise button is pressed and held to set
or cancel an exercise period.
3. Blinks once per second when an exercise period is active.
4. Is off when no repeat exercise periods are set.

Test

1. This indicator blinks at two times per second rate during the two seconds that the
Test button is pressed to acknowledge that a test has been activated or when the
remote test input is grounded.
2. The indicator lights constantly during the test and goes out once the test is terminated or normal power has failed.
3. The indicator blinks at two times per second rate during the two seconds to acknowledge that the Test button has been pressed to cancel a Test. The light then
goes out.

4-2

TROUBLESHOOTING THE TRANSFER
SWITCH

switches that include a control panel. Common
problems are listed with their possible causes. Refer to the corrective action column for the appropriate corrective procedure.

Use the troubleshooting guide (Table 4-2) to help
diagnose transfer switch problems with transfer

TABLE 4-2. TROUBLESHOOTING TRANSFER SWITCHES WITH AN OPERATOR PANEL
WARNING AC power within the cabinet presents a shock hazard that can cause severe personal
injury or death. Do not remove the front panel under any circumstances.
WARNING Improper operation of the generator presents a hazard that can cause severe personal
injury or death. Observe all safety precautions in your generator manuals.

Problem

Possible Cause

Corrective Action

The Generator does not start
when the utility fails

There may be a generator problem.

Move the generator’s operation selector
switch to the Run/On position.
1. If the generator starts and the transfer switch transfers, the generator
may not have received the start signal from the controller. Contact your
local Cummins distributor for service.
2. If the generator does not start, contact your local Cummins distributor
for service.

The generator is running but
the transfer switch did not
transfer the load to the generator. The Generator Available
LED is off.

The generator circuit breaker has been
tripped or is in the Off position.

Reset the circuit breaker on the generator. If the problem still persists, contact
your local Cummins distributor for service.

The generator is running but
the transfer switch did not
transfer the load to the generator. The Generator Available
LED is on.

A time delay normal to emergency
(TDNE) may be timing.

Wait until the time delay has expired or
press the Override pushbutton on the
control panel. If the problem still persists, contact your local Cummins distributor for service.

The generator is running but
the transfer switch did not
transfer the load to the generator. The Utility Connected
LED is flashing.

The control was unsuccessful in its attempts to open the Utility side of the
transfer switch. After 5 attempts to move
the transfer switch, the Utility Connected
LED flashes, indicating that it failed to
open.

Press the Override pushbutton on the
control panel to reset the control so that
it will attempt to open the Utility side of
the transfer switch. If the problem still
persists, contact your local Cummins
distributor for service.

Utility power is restored but
The main service circuit breaker has
the transfer switch does not
been tripped or is in the Off position.
transfer to the utility. The Utility Power Available LED is off.

Reset the circuit breaker on the main
service panel. If the problem still persists, contact your local Cummins distributor for service.

Utility power is restored but
the transfer switch does not
transfer to the utility. The Utility Power Available LED is
on.

Wait until the time delay has expired or
press the Override pushbutton on the
control panel. If the problem still persists, contact your local Cummins distributor for service.

A time delay emergency to normal
(TDEN) may be timing.

4-3

TABLE 4-2. TROUBLESHOOTING TRANSFER SWITCHES WITH AN OPERATOR PANEL (CONTINUED)
WARNING AC power within the cabinet presents a shock hazard that can cause severe personal
injury or death. Do not remove the front panel under any circumstances.
WARNING Improper operation of the generator presents a hazard that can cause severe personal
injury or death. Observe all safety precautions in your generator manuals.

Problem

Possible Cause

Corrective Action

Utility power is restored but
the transfer switch does not
transfer to the utility. The
Generator Connected LED is
flashing.

The control was unsuccessful in its attempts to open the Generator side of the
transfer switch. After 5 attempts to move
the transfer switch, the Generator Connected LED flashes, indicating that it
failed to open.

Press the Override pushbutton on the
control panel to reset the control so that
it will attempt to open the Generator side
of the transfer switch. If the problem still
persists, contact your local Cummins
distributor for service.

The generator did not shut
down after the transfer switch
has transferred the load to
the utility.

1. A time delay engine cooldown
1. Wait for the time delay to expire. The
(TDEC) may be timing.
time delay may last up to 30 minutes.
2. The selector switch on the generator
2. Make sure the generator control is
control panel may not be in the
set to the Remote position.
correct position.
If the problem persists, move the generator control selector switch to the Off
position to shut down the generator.
Contact your local Cummins distributor
for service.

The generator is running for
no apparent reason.

1. The selector switch on the generator
control panel may not be in the
correct position.
2. There may be an active test or
Exercise period. Check to see if the
Test or Exercise LEDs are blinking.

4-4

1. Make sure the generator control is
set to the Remote position.
2. Wait for exercise or test period to
expire or press the Override button
to stop and exercise or the test
button to stop a test.
If the problem persists, move the generator control selector switch to the Off
position to shut down the generator.
Contact your local Cummins distributor
for service.

Problem
The generator did not exercise when expected to.

Possible Cause

Corrective Action

1. The selector switch on generator
control panel may not be in the correct position.
2. An exercise period may not be set
or is set but not yet started.

1. Verify that the operation selector
switch on the generator control panel is set to the Remote position.
2. Check the Exercise LED on the control panel to see if it is lit.
a. If the Exercise LED is not lit, no
exercise period has been set.
Refer to the generator exerciser
section for information on setting
an exercise.
b. If the Exercise LED is lit but not
flashing, the exercise period has
not yet started. Exercisers do not
display exercise start and stop
times.
3. Try starting the generator using its
start-stop controls. If it does not
crank, check the starting batteries
and cable connections. If it cranks
but does not start, check the fuel
supply.
If the problem persists, contact your local Cummins distributor for service.

3. There may be generator problems.

4-5

HOW TO OBTAIN SERVICE
When the transfer switch requires servicing, contact your nearest Cummins Power Generation distributor. Factory-trained Parts and Service representatives are ready to handle all your service
needs.

Model No. ____________

To contact your local Cummins Power Generation
(CPG) distributor in the United States or Canada,
call 1-800-888-6626 (this automated service utilizes touch-tone phones only). By selecting Option
1 (press 1), you will be automatically connected to
the distributor nearest you.

FIGURE 4-2. MODEL AND SERIAL NUMBER LABEL

Serial No. ____________

SCREW TO
BE REMOVED

If you are unable to contact a distributor using the
automated service, consult the Yellow Pages. Typically, our distributors are listed under:

PANEL COVER

Generators-Electric,
Engines-Gasoline or Engines-Diesel, or
Recreational Vehicles-Equipment,
Parts and Service.
If it is necessary to contact a distributor regarding
the transfer switch, always give the complete Model
and Serial number. This information (included on
the model and serial number label − see Figure 4-2)
is necessary to properly identify your unit among
the many types manufactured.
For models with a control, the label is located on the
back of the operator panel cover. To view the label
(see Figure 4-2), remove the screw securing the operator panel cover and open the cover (see Figure
4-3).

FIGURE 4-3. OPERATOR PANEL COVER

4-6

Cummins Power Generation
1400 73rd Ave. NE
Minneapolis, MN 55432 USA
Phone 1 763 574 5000
Toll-free 1 800 888 6626
Fax 1 763 574 5298
Email www.cumminsonan.com/contact
www.cumminsonan.com
CumminsR, OnanR, the “C” logo, and “Performance you rely on.”
are trademarks of Cummins Inc.
E2007 Cummins Power Generation, Inc. All rights reserved.

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