Emerson 7000 manual 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 switch until both power sources are disconnected (all conductors deenergized).

1.Deenergize both the normal and emergency source conductors (remove fuses or open circuit break- ers).

2.Use the maintenance handle to manually operate the transfer switch to the opposite source. See Manual Operation on page 1–2.

3.If the transfer switch is in the Emergency position manually start the engine generator and then install emergency source fuse or close the circuit breaker.

TROUBLE-SHOOTING

Note any optional accessories that may be furnished on the automatic transfer switch (ATS) and review their operation. Refer to any separate drawings and/or instructions that may be packed with the ATS.

Hazardous voltage capable of causing shock, burns, or death is used in this switch.

Do not touch the power or load terminals of the transfer switch!

Table 2-1. Trouble-Shooting Checks.

PROBLEM	CHECK IN NUMERICAL SEQUENCE
	1	2	3
	OPERATION	GEN-SET	VOLTAGE
Engine–generator set does	Hold Transfer Test switch 15	Starting control must be in the
not start when the Transfer	seconds or the outage must	automatic position. Batteries
Control switch is turned and	be long enough to allow for	must be charged and
held in Transfer Test position	Feature 1C time delay plus	connected. Check wiring to	–
or when the normal source	engine cranking and starting	engine starting contacts on
fails.	time.	customer terminal block TB.
		Verify that the small plug J3 is
		connected to receptacle P3.
Transfer switch does not	Wait for Feature 2B time delay	Generator output circuit	Voltmeter should read at least
transfer the load to the	to time out (if used).	breaker must be closed.	90% of nominal phase to
emergency source after the		Generator frequency must be	phase voltage between
engine–generator set starts.		at least 95% of nominal	transfer switch terminals EA
		(57 Hz for a 60 Hz system.) *	and EC (or EL1 and EL2 for 2
			pole switches). *
Transfer switch does not	Wait for Feature 3A time delay		Voltmeter should read at least
transfer the load to normal	to time out (if used).		90% of nominal phase to
source when normal returns			phase voltage between
or when the Transfer Control		–	transfer switch terminals NB
switch is released.			and NC, NC and NA, and NA
			and NB (or NL1 and NL2 for 2
			pole switches).
Engine–generator-set does	Wait for Feature 2E time delay	Starting control must be in the
not stop after load retransfer	to time out (if used).	automatic position.	–
to the normal source.

* These are factory settings. Refer to the Group 5 Controller User’s Guide.

If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies sales office or ASI. In the United States, call 1–800–800–2726. In Canada, call 1–888–234–2726. Furnish the Serial No., Bill of Material (BOM) No., & Catalog No. from transfer switch nameplate.

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