Emerson THROUGH 1200 manual Voltage Checks, Automatic Closed Transition Transfer Switch

INSTALLATION (continued)

observe these lights

Automatic Closed Transition

Transfer Switch

		Transfer
Transfer Switch	Transfer Switch	Control
Connected	Connected	Retransfer	Transfer	Extended	Failure	TS
To	To	Delay	Test	Parallel	To	Locked
Normal	Emergency	Bypass	(15HOLDSECONDSFOR )	Time	Synchronize	Out
GREEN	RED			RED	RED	RED
Normal	Emergency					Closed
Source	Source				Alarm	Transition
Accepted	Accepted				Reset	Bypass
GREEN	RED

Figure 1-6. 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.

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Before energizing the switch check to be sure that both normal and emergency contacts are not left in the closed position.

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

Use extreme caution when using a meter to measure voltages. Do not touch power termi- nals; shock, burns, or death could result !

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

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. (Start generator,

3if necessary.) 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.*

■ Black square means light is on.

Use a phase rotation meter to

A B C

❐ White square 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.

Note: Refer to Section 3 of Group 5 Controller User’s Guide 381333–126 for how to display the Status of the ATS and the Voltage and Frequency of each source.

Now continue to 3 --- Electrical Operation on next page.

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- cy Source Accepted light should

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

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