Emerson 300 manual Installation, Voltage Checks

INSTALLATION (continued)

Figure 1-4. Maintenance handle operation and contact position indicators.

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.

O Black 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 recommen-

dations. The Automatic Transfer Switch will respond

only to the rated voltage specified on the Transfer

	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.*

Switch nameplate.

Use a phase rotation meter to

A B C

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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