Emerson 400A manual Installation, Voltage Checks

INSTALLATION (continued)

observe these lights

Figure 1–5. Standard controls and indicators.

2 – Voltage Checks

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

Use extreme caution when using a meter to measure voltages in the following steps.

Do not touch power terminals; shock, burns, or death could result !

Perform steps 1 through 6 at the right. Observe the status lights. See Figure 1–5.

OBlack circle means light is on. P White circle means light is off.

*If necessary, adjust voltage regulator on the generator according to the manufacturer’s recommendations. The Automatic Transfer Switch will respond only to the rated voltage specified on the Transfer Switch nameplate.

Also see page 4–1 for the HI–LOW voltage adjust

Close the normal source circuit
breaker. The Normal Transfer	Source Accepted
1 Switch Position and the Normal	Normal
Source Accepted lights should
	Emergency
come on.

Use an accurate voltmeter to check phase to phase and

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

Close the emergency source	Source Accepted
circuit breaker. (Start generator,
3 if necessary.) The Emergency	Normal
Source Accepted light should	Emergency
come on.

Use an accurate voltmeter to check phase to phase and

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

setting in the controller. The LOW setting shifts all

Use a phase rotation meter to

A B C

voltage settings down 4.2%; for example, 240 V to 230 V.

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

Shut down the engine–genera-
tor, if applicable. The Emergen-	Source Accepted
cy Source Accepted light should
6 go off. Then put the starting	Normal
control selector switch (on the	Emergency
generator set) in the automatic
position. Close enclosure door.

Now continue to 3 – Electrical Operation on next page.

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