TRENDnet Series 300 TESTING & SERVICE continued, Manual Load Transfer, Trouble-Shooting, Problem

TESTING & SERVICE (continued)

MANUAL LOAD TRANSFER

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

!

Do not manually operate the transfer switch 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 switch to the opposite source. See page 1–3, Manual Operation Test.

3.If the transfer switch 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 switch 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 switch does not	Wait for Transfer to Emergen-	Generator output circuit		Voltmeter should read at
transfer the load to	cy Delay (0 to 5 min.) to time	breaker must be closed.		least 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 57 Hz.		transfer switch terminals EA
	DELAY button. If Motor Load			and EC (or EL1 and EL2 for 2
	Transfer is active, wait for in-			pole switches). *
	phase condition (see below).			* These are factory settings.
Transfer switch does not	Wait for Retransfer to Normal			Voltmeter should read at least
transfer the load to normal	Delay (1 sec. to 30 min.) to			90% of nominal phase to
source when normal returns	time out. For immediate re–			phase voltage between
or when TRANSFER SWITCH	transfer, press BYPASS TIME		—	transfer switch terminals NB
TEST button is released.	DELAY button. If Motor Load			and NC, NC and NA, and NA
	Transfer is active, wait for in-			and NB (or NL1 and NL2 for 2
	phase condition (see below).			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 !

3.Press and hold TRANSFER SWITCH 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 Switch Test button. The load should retransfer back to the normal source after the

1.Connect a voltmeter (set for twice system phase–to–phase voltage) between Transfer Switch terminals NA and EA.

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

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 switch, call your local ASCO Power Technologies sales office. Furnish Serial No., Bill of Material (BOM) No., & Catalog No. from the transfer switch nameplate.

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