TROUBLESHOOTING
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 can be contacted at
ELECTROCUTION – FLASH HAZARD |
Do not work on the transfer switch |
until both the utility and generator are |
off. Turn OFF both circuit breakers. |
Problem 1
The UTILITY acceptable light does not come on when utility power is connected to the automatic transfer switch.
●Verify that the utility feed is 240 V ac nominal and 60 Hz.
●Verify that the utility feed is wired to the terminal lugs on the bottom of the transfer switch marked L1 and L5.
●Verify that the utility feed is connected and that its circuit breaker is ON.
●With ALL POWER OFF, verify that the transfer switch harness is connected properly to the controller (plug at the bottom).
Problem 2
Power is connected (UTILITY acceptable light and/or GENERATOR acceptable lights are on) but both TRANSFER SWITCH position lights are off.
●With ALL POWER OFF, verify that the transfer switch harness is connected properly to the controller (plug at the bottom).
Problem 3
Generator does not crank when the utility source fails or when the Push to Test button is pressed.
●Verify that the generator starting controls are set for automatic operation.
●Verify engine start low voltage wiring between controller terminal block TB7 (plug on the left) and the generator. Check that TB7 plug is properly seated in TB7 receptacle.
●Verify that the generator battery is connected and that the battery voltage meets the generator manufacturer’s recommendation.
●Verify that the correct contact (normally open or normally closed) is being utilized (see the generator manual).
Problem 4
Generator cranks but does not start when the utility source fails or when the Push to Test button is pressed.
●Verify engine start low voltage wiring between controller terminal block TB7 (plug on the left) and the generator. Check that TB7 plug is properly seated in TB7 receptacle.
●Verify proper generator operation (see generator manual).
Problem 5
The automatic transfer switch does not transfer the load to the generator (TRANSFER SWITCH on generator light does not come on).
●Verify that the GENERATOR source acceptable light is on. The transfer switch will not retransfer the load to the genera- tor until the generator output is acceptable. If the light is off verify that the circuit breaker for the generator feed is ON.
●Wait 15 seconds. There is a 15 second delay after the generator output becomes acceptable to permit the generator to warm up.
●If the GENERATOR source acceptable light still does not come on, see Problems 3 and 4.
Problem 6
The automatic transfer switch does not transfer the load back to the utility (TRANSFER SWITCH on utility light does not come on).
●Verify that the UTILITY source acceptable light is on. The transfer switch will not retransfer the load to the utility until the utility source is acceptable and the light is on. If light is off, verify that the circuit breaker from the utility feed is ON.
●Wait 5 minutes. There is a 5 minute delay on retransfer to the utility.
Problem 7
The GENERATOR source acceptable light does not go off after the automatic transfer switch retransfers the load back to the utility.
●Wait 1 minute. After load retransfer to the utility, there is a 1 minute delay for generator cooldown before shut down.
●Verify proper operation of the generator (see the generator manual).
Problem 8
Both TRANSFER SWITCH position lights are flashing (this indicates an error condition). *
●Count the number of times the Automatic Generator Exerciser light flashes (repeats after pause). This number is the error code.
●Error codes:
2 Generator failed to start. | See Problems 3 and 4. |
3Generator failed after starting. See generator manual.
4Generator over frequency. See generator manual.
5Transfer Switch did not transfer the load
| to the generator. Service required. | |
6 | Transfer Switch did not transfer the load | |
| to the utility. | Service required. |
7 | Controller error. | Service required. |
●To clear error code, press and release Push to Test button.
*NOTE: These lights will flash only when controller power is available from either of the two power sources.
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