Use and Care Manual

2008 Cummins Inc. All rights reserved.
4-3
TROUBLESHOOTING THE TRANSFER
SWITCH
Use the troubleshooting guide (Table 4-2) to help
diagnose transfer switch problems with transfer
switches that include a control panel. Common
problems are listed with their possible causes. Re-
fer to the corrective action column for the appropri-
ate corrective procedure.
TABLE 4-2. TROUBLESHOOTING TRANSFER SWITCHES WITH AN OPERATOR PANEL
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.
Improper operation of the generator presents a hazard that can cause severe personal
injury or death. Observe all safety precautions in your generator manuals.
WARNING
WARNING
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 trans-
fer switch transfers, the generator
may not have received the start sig-
nal from the controller. Contact your
local Cummins distributor for ser-
vice.
2. If the generator does not start, con-
tact your local Cummins distributor
for service.
The generator is running but
the transfer switch did not
transfer the load to the gener-
ator. 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 genera-
tor. If the problem still persists, contact
your local Cummins distributor for ser-
vice.
The generator is running but
the transfer switch did not
transfer the load to the gener-
ator. 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 per-
sists, contact your local Cummins dis-
tributor for service.
The generator is running but
the transfer switch did not
transfer the load to the gener-
ator. The Utility Connected
LED is flashing.
The control was unsuccessful in its at-
tempts 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 transfer switch does not
transfer to the utility. The Utili-
ty Power Available LED is off.
The main service circuit breaker has
been tripped or is in the Off position.
Reset the circuit breaker on the main
service panel. If the problem still per-
sists, contact your local Cummins dis-
tributor for service.
Utility power is restored but
the transfer switch does not
transfer to the utility. The Uti-
lity Power Available LED is
on.
A time delay emergency to normal
(TDEN) may be timing.
Wait until the time delay has expired or
press the Override pushbutton on the
control panel. If the problem still per-
sists, contact your local Cummins dis-
tributor for service.