Emerson 7ACTB manual Functional Test, Voltage Checks, INSTALLATION continued

INSTALLATION (continued)

GREEN RED RED RED RED

observe these lights

GREEN RED

Figure 1-3. Standard controls and indicators.

Functional Test

Read all instructions on the Wiring Diagrams and labels affixed to the ACTB. Note the control features that are provided and review their operation before proceeding.

After installing the ACTB check the following:

–Bypass Handle should be in the OPEN position.

–Isolation Handle should be in the CLOSED position.

–CN transfer switch should be CLOSED.

–CE transfer switch should be OPEN.

If handles are not in correct positions, follow instructions for Bypassing and Isolating the automatic transfer switch in Section 3. Do not force the handles. Electrical interlocks prevent a wrong sequence of operation.

1 – Voltage Checks

First check nameplate on transfer switch; rated voltage must be the same as normal and emergency line voltages.

Close the normal source circuit breaker. The Transfer Switch

1Connected To Normal and the Normal Source Accepted lights should come on.

Use an accurate voltmeter to check phase to phase and

2phase to neutral voltages pres- ent at the transfer switch normal source terminals.

Close the emergency source circuit breaker. Turn the Engine Control switch to Run to start

3the generator. The Transfer Switch Connected To Normal & Emergency Source Accepted lights should come on.

Use an accurate voltmeter to check phase to phase and

4phase to neutral voltages pres- ent at the transfer switch emer- gency source terminals.*

Use extreme caution when using a meter

Use a phase rotation meter to

A B C

to measure voltages. Do not touch power

terminals; shock, burns, or death could result !

Perform steps 1–6 at the right. Observe the status lights. See Figure 1–3.

■Black square means light is on.

❐White square means light is off.

*If necessary, adjust voltage regulator on generator per the manufacturer’s recommendations. The ACTB will respond only to rated voltage specified on the nameplate.

Now continue to 2 – Electrical Operation on next page.

1---3

5 check phase rotation of emer- gency source; it must be the same as the normal source.

Turn Engine Control switch to Auto to stop the generator. The Emergency Source Accepted

6light should go off. Then put the starting control selector switch (on generator set) in automatic position. Close enclosure door.