Emerson 7000 SERIES ATB manual Testing & Service, Trouble-Shooting, Manual Load Transfer

TESTING & SERVICE (continued)

TROUBLE-SHOOTING

Note any optional accessories that may be furnished on the ATB and review their operation. Refer to any sepa- rate drawings and/or instructions that may be packed with the ATB.

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.

	CHECK IN NUMERICAL SEQUENCE
PROBLEM
	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 normal source fails.	engine cranking and starting.	engine starting contacts.
Transfer switch does not	Wait for Feature 2B time delay	Generator output circuit	Voltmeter should read at
transfer the load to the	to time out.	breaker must be closed.	least 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 (57	transfer switch terminals EA &
		Hz for a 60 Hz system.) *	EC (or EL1 & EL2 for 2 pole)*
Transfer switch does not	Wait for Feature 3A time delay		Voltmeter should read at least
transfer the load to normal	to time out.		90% of nominal phase to
source when normal returns		---	phase voltage between
or when the Transfer Control			transfer switch terminals NB &
switch is released.			NC, NC & NA, & NA & NB (or
			NL1 & NL2 for 2 pole).
Engine–generator-set does	Wait for Feature 2E time delay	Starting control must be in the
not stop after load retransfer	to time out.	automatic position.	---
to the normal source.

* These are factory settings. Refer to 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., and Catalog No. from the transfer switch nameplate.

MANUAL LOAD TRANSFER

This procedure manually transfers load to other source if the Transfer Switch or Control Panel are out of service.

!
Close all enclosure doors to prevent personal
injury in case of electrical system fault.
1. Be sure that the Bypass Handle is in the BYPASS	Figure 2–1. Bypass Handle.
POS (position) (see page 3–1).

2.Be sure that the Isolation Handle is in the TEST or DISCONNECTED position (see page 3–2).

3.Turn the Bypass Handle clockwise to AUTOMATIC POS (position).

4.Then pull–out or push–in the Bypass Handle and turn it back to BYPASS POS (select opposite source):

-Emergency Source - pull out the handle

-Normal Source - push in the handle

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