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

INSTALLATION (continued)

GREEN RED

observe these lights

GREEN RED AMBER

Figure 1-2. Standard controls and indicators.

Functional Test

Read all instructions on the Wiring Diagrams and labels affixed to the 7ADTB. Note the control features that are provided and review their operation before proceeding.

After installing the 7ADTB check the following:

–Bypass Handle should be in the NORMAL position.

–Isolation Handle should be in the CONN position.

–CN transfer switch should be C (closed)

–CE transfer switch should be O (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.

Use extreme caution when using a meter 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 1–2.

■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 7ADTB will respond only to rated voltage specified on the nameplate.

Now continue to 2 – Electrical Operation on next page.

Close the normal source circuit breaker. The Transfer Switch

1Connected To Normal and the

	Normal Source Accepted lights	Active
		Load
		Disconnect
	should 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
	circuit breaker. (Start generator,
3	if necessary.) The Transfer
	Switch Connected To Normal &	Load
	Emergency Source Accepted	Disconnect
		Active
	lights should 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.*
	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-
	cy Source Accepted light should
6 go off. Then put the starting
	control selector switch (on the	Active
		Load
		Disconnect
	generator set) in the automatic
	position. Close enclosure door.

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