Emerson 7ACTB manual Electrical Operation, INSTALLATION continued, Transfer Test

INSTALLATION (continued)

GREEN REDREDRED RED

observe	operate
these lights	this switch
GREEN	RED

Figure 1-4. Standard controls and indicators.

2 – Electrical Operation

This procedure checks electrical operation of the ATS.

Be sure to close the enclosure door

before proceeding to prevent personal injury

in case of electrical system fault.

Transfer Test

The ATS should be bypassed and isolated. Both normal and emergency sources must be available and the emergency source generator (if used) must be capable of being started; put engine starting control in automatic position. The Transfer Switch Connected to Normal light and the Normal Source Accepted light should be on.

1.Turn the Isolation Handle clockwise (approximately 7 turns) until the window shows TEST position.

NOTE: The engine generator may be signalled to start while turning the Isolation Handle. If emergency source is available, the ATS may operate to the emergency position. If it does, operate Retransfer Delay Bypass switch.

2.Perform steps 1–4 at right. Observe the status lights.

■Black square means light is on.

❐White square means light is off.

3.Turn the Isolation Handle clockwise (approximately 16 turns) to the CONN (connected) position.

4.Push in the Bypass Handle and turn it counterclock- wise until the OPEN indicator shows green.

This completes the Functional Test of the ACTB.

1---4

Turn and hold Transfer Control switch clockwise to Transfer

1Test until the engine starts and runs (within 15 sec.). The Emergency Source Accepted light should come on.

Transfer switch CE closes and then Transfer Switch CN opens (closed–transition overlap). The Transfer Switch Connected to

2Emergency light should come on and the Transfer Switch Con- nected to Normal light should go off (you might see and hear the brief overlap transfer).

Transfer switch will operate back to Normal position after Feature 3A time delay. For im- mediate retransfer turn Transfer

3Control counterclockwise to Retransfer Delay Bypass. The Transfer Switch Connected To Normal light should come on; Transfer Switch Connected to Emergency light should go off.

The engine–generator will stop after the Feature 2E time delay

4(unloaded running engine cool- down). The Emergency Source Accepted light should go off.

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