Transfer Switch Specifications
| Rated current | 100, 230, 260, 400 A |
|---|---|
| Voltage | 220, 240 V |
Troubleshooting
12| Symptom | Cause | Remedy |
|---|---|---|
| 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. | |
| 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 utility source fails or when the Transfer Test button is pressed. | 1. Verify that the generator starting controls are set for automatic operation (not in manual mode). 2. Verify that the generator battery is connected and that the battery voltage meets the generator manufacturer’s recommendation. 3. Verify that the correct contact (normally open or normally closed) is being utilized (see the generator manual). 4. 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 starts and runs but the Generator Acceptable light does not come on. | 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 ATS does not transfer the load to the generator. | 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 ATS does not immediately 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. Wait approximately 10 seconds for the transfer to generator time delay. This fixed delay allows the generator output to stabilize before a load is applied to it. 3. Press the Bypass Time Delay button for immediate load transfer to the generator. | |
| The ATS transfers the load to the generator, but the generator bogs down (struggles or slows down). The ATS retransfers back to the utility. | 1. The generator may be overloaded. Check to see if the generator circuit breaker tripped. Check the sum of the loads to be sure it does not exceed the capacity of the generator. Some motor loads require three times more power for starting. 2. Check for short circuit in a connected load. | |
| The generator stops after a running for awhile. The ATS retransfers back to the utility (if acceptable). | 1. Verify proper generator operation; it may have run out of fuel or shut down because of low oil level (see generator manual). 2. The generator may be overloaded. Check to see if the generator circuit breaker tripped. Check the sum of the loads to be sure it does not exceed the capacity of the generator. Some motor loads require three times more power for starting. 3. Check for short circuit in a connected load. | |
| The ATS does not retransfer the load back to the utility. | 1. Wait approximately 5 minutes for the retransfer to utility time delay. The utility must be acceptable for 5 minutes continuously. 2. Press the Bypass Time Delay button for immediate load retransfer to the utility. | |
| The ATS retransfers the load back to the utility but the generator keeps running. | 1. Wait approximately 2 minutes for the unloaded running (engine cooldown) time delay. 2. The engine cooldown fixed time delay is important to prevent generator damage. | |
| The generator exerciser does not seem to work. | 1. Verify that the Automatic Generator Exerciser status light is blinking. --- Light blinks during the exercise period. --- Light stays on when then exerciser has been set. --- When light is off, no exercise period is set. 2. With ALL POWER OFF, verify that the exerciser is turned on. Check DIP switch S1 actuator 7, and S2 actuator 10. See Table B for generator exerciser settings. 3. With ALL POWER OFF, check the 9 volt battery. Replace, if necessary, with a quality alkaline battery: Duracell MN1404, Everready 522, Panasonic 6AM6, or equivalent. See Figure 5. | |
| The generator exerciser does not transfer the load to the generator. | 1. Verify that the Automatic Generator Exerciser status light is blinking. --- Light blinks during the exercise period. --- Light stays on when then exerciser has been set. --- When light is off, no exercise period is set. 2. With ALL POWER OFF, verify that the exerciser is turned on. Check DIP switch S1 actuator 8. See Table B for generator exerciser settings. |
Symptom → cause → remedy extracted from this unit’s service/owner documentation; verify against the official manual before servicing.
About
Asco 185 — transfer switch. Specifications and parts compiled from manufacturer documents.