Emerson ASCO 185 - Manual (Page 10)

TROUBLESHOOTING Series 185
8 381333–319 D
This troubleshooting guide describes some of the simple
causes of problems with the installation of the automatic
transfer switch. Troubleshooting beyond the scope of this
guide should not be attempted by the installer. A licensed
electrician must perform all internal troubleshooting.
ASCO Power Technologies can be contacted at:
1–800–800–2726 or [email protected]
ELECTROCUTION FLASH HAZARD Do not work
on the transfer switch until both the utility and
generator are off. Turn OFF both circuit breakers.
Problem Cause and Solution
The Utility Acceptable light
does not come on when utility
power is connected to the ATS.
1. Verify that the utility feed is connected and that its circuit breaker is ON.
2. With ALL POWER OFF, verify that the utility feed is 220–240 V ac and 60 Hz.
Check DIP switch S2 actuator 2, and DIP S1 actuator 4. See Table D for voltage
and frequency settings.
3. With ALL POWER OFF, verify that the utility feed is wired to the terminal lugs
on the bottom of the transfer switch marked L1 and L5. See the wiring diagram.
4. With ALL POWER OFF, verify that the transfer switch harness is connected
properly to the controller (plug and receptacle tight).
The generator does not crank
when the utility source fails or
when the Transfer Test button is
pressed.
1. Hold the Transfer Test button for at least 15 seconds.
2. Verify that the generator starting controls are set for automatic operation (not in
manual mode).
3. Verify that the generator battery is connected and that the battery voltage meets
the generator manufacturer’s recommendation.
4. Verify that the correct contact (normally open or normally closed) is being
utilized (see the generator manual).
5. With ALL POWER OFF, verify engine start low voltage wiring between the
controller terminal block and the generator. See the wiring diagram. Check that
the plug is properly seated in the receptacle on the controller.
The generator cranks but does
not start and run when the util-
ity source fails or when the
Transfer Test button is pressed.
1. Verify proper generator operation (fuel in tank, oil level, spark plugs --- see
generator manual).
2. With ALL POWER OFF, verify engine start low voltage wiring between the
controller terminal block and the generator. See the wiring diagram. Check that
the plug is properly seated in the receptacle.
The generator starts and runs
but the Generator Acceptable
light does not come on.
1. Verify that the generator feed is connected and that its circuit breaker is ON.
2. With ALL POWER OFF, verify that the generator feed is 220–240 V ac and 60
Hz. Check DIP switch S2 actuator 2, and DIP S1 actuator 4. See Table D for
voltage and frequency settings.
3. With ALL POWER OFF, verify that the generator feed is wired to the terminal
lugs on the top of the transfer switch marked L2 and L6. See the wiring diagram.
4. With ALL POWER OFF, verify that the transfer switch harness is connected
properly to the controller (plug and receptacle tight).
5. Verify generator ac output (voltage and frequency --- see generator manual).
The generator starts and runs
but the ATS does not transfer
the load to the generator.
1. Verify that the Generator Acceptable light is on. If it is off, see previous trouble-
shooting problem. The ATS will not transfer the load to an unacceptable source.
2. With ALL POWER OFF, verify that the transfer switch harness is connected
properly to the controller (plug and receptacle tight).