Emerson 7000 manual Adts Electrical Operation, Adts controls and indicators

2-5 Operation 381333-395

Figure 2-7. 7ADTS controls and indicators.

ADTS Electrical Operation

This procedure checks the electrical operation of the automatic delayed-transition transfer switch. See Figure 2-7.

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.

1Turn 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.

2CBN opens and the Transfer Switch Connected to Normal light should go off and the Load Disconnect Active light should come on. Both CBN and CBE contacts are now open.

3After the delay transition time delay, CBE closes. The Transfer Switch Connected to Emergency light should come on and the Load Disconnect Active light goes off.

4CBN closes 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.