Emerson Series 300 manual Voltage Checks

INSTALLATION (continued)

observe these lights

Figure 1–5. St andard controls and indicators.

2 – Voltage Checks

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

Verify that the feeders have been connected to the proper lugs.

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.

●Black circle means light is on.

❍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.

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

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

	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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