Emerson 7000 ATS Electrical Operation, Transfer Test, Black square means light is on, 381333-395

2-3 Operation 381333-395

Figure 2-5. 7ATS controls and indicators.

ATS Electrical Operation

This procedure checks the electrical operation of the automatic transfer switch. See Figure 2-5.

Transfer Test

Both normal and emergency sources must be available and the emergency source generator (if used) must be capable of being started in this procedure.

Perform the steps at the right. Observe the status lights.

■Black square means light is on.

□White square means light is off.

1The Transfer Switch Connected to Normal and Normal Source Accepted lights should be on.

2Turn and hold the Transfer Control switch clockwise to Transfer Test until the engine starts and runs (within 15 sec.). The Emergency Source Accepted light should come on.

3The transfer switch will operate to the Emergency position after Feature 2B time delay.

The Transfer Switch Connected to Emergency light should come on and Load Connected to Normal light goes off.

4The transfer switch will operate back to the Normal position after Feature 3A time delay.

For immediate retransfer turn the Transfer Control counter- clockwise to Retransfer Delay Bypass.

The Transfer Switch Connected to Normal light should come on; the Transfer Switch Connected to Emergency light should go off.

5The engine-generator will stop after the Feature 2E time delay (unloaded running engine cool- down). The Emergency Source Accepted light should go off.