Emerson 381333234 E manual Testing & Service, Manual Load Transfer, Trouble-Shooting

TESTING & SERVICE (continued)

MANUAL LOAD TRANSFER

This procedure will manually transfer the load if the controller is disconnected.

Do not manually operate the transfer switching device until both power sources are disconnected: open both circuit breakers.

1.Open normal and emergency source circuit breakers.

2.Use the maintenance handle to manually operate transfer switching device to the opposite source. See page 1–4, Manual Operation Test.

3.If the transfer switching device is in the Emergency position manually start the engine generator and then close the emergency source circuit breaker.

TROUBLE-SHOOTING

Note the control features that are activated or furnished on the switch and review their operation. Refer to Section 5, Control Features.

Proceed with care! The automatic transfer switching equipment is energized.

Table 3-1. Trouble-Shooting Checks.

PROBLEM	CHECK IN NUMERICAL SEQUENCE
	1 OPERATION	2 GEN-SET	3 VOLTAGE
Gen-Set does not start when	Hold the TRANSFER SWITCH	Starting control must be in
the TRANSFER SWITCH TEST	TEST button 15 sec. or the	automatic position. Batteries
button is pressed and held for	outage must be long enough	must be charged and
15 seconds or when the	to allow for the 1 or 3 sec.	connected. Check wiring to	—
normal source fails.	Momentary Normal Source	engine starting contacts.
	Outage Delay plus engine
	cranking and starting time.
Transfer switching device	Wait for Transfer to Emergen-	Generator output circuit	Voltmeter should read at least
does not transfer the load to	cy Delay (0 to 5 min.) to time	breaker must be closed.	90% of nominal phase to
emergency source after the	out. For immediate transfer,	Generator frequency must be	phase voltage between
gen-set starts.	press the BYPASS TIME	at least 95% of nominal	transfer switch terminals U2
	DELAY button. If Motor Load	(48 Hz for a 50 Hz system).	and W2 (or L1 and L5 for 2
	Transfer is active, wait for in-		pole switches). *
	phase condition (see below).		* These are factory settings.
Transfer switching device	Wait for Retransfer to Normal		Voltmeter should read at least
does not transfer the load to	Delay (1 sec. to 30 min.) to		90% of nominal phase to
normal source when normal	time out. For immediate re–		phase voltage between
returns or when TRANSFER	transfer, press BYPASS TIME	—	transfer switching device
SWITCH TEST button is	DELAY button. If Motor Load		terminals V1 and W1, W1 and
released.	Transfer is active, wait for in-		U1, and U1 and V1 (or L2 and
	phase condition (see below).		L6 for 2 pole switches).
Gen-Set does not stop after	Wait for the 5 minute	Starting control must be in
load retransfer to the normal	Unloaded Running Delay to	automatic position.	—
source.	time out.

Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–3)

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 !

1.Connect a voltmeter (set for twice system phase–to–phase voltage) between transfer switching device terminals U1 and U2 (for 3 pole) or L1 and L2 (for 2 pole).

2.Manually start generator. Voltmeter needle should sweep back and forth at a regular rate between 0 and about twice system voltage.

3.Press and hold the Transfer Test button. The load should transfer to emergency source when meter needle is near 0 volts. If transfer does not occur, Motor Load Transfer feature is not operating.

4.Release the Transfer Test button. The load should retransfer back to the normal source after the Retransfer to Normal Delay, if used. The retransfer should occur when the needle is near 0 volts. If retransfer does not occur after the time delay, the Motor Load Transfer feature is not operating.

5.For immediate retransfer, press the Bypass Time Delay button. Then disconnect the voltmeter.

If the problem is isolated to circuits on the controller or the transfer switching device, call your local ASCO Power Technologies sales office. Furnish Serial No., Bill of Material (BOM) No., & Catalog No. from the transfer switching device nameplate.

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