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

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

2.Use the maintenance handle to manually operate the transfer switch to the opposite source. First open the closed contacts, then close the other contacts. Do not try to close both Normal and Emergency contact. See Manual Operation on page 1–3 through 1–6.

3.Then remove the maintenance handle..

Verify that the maintenance handle

has been removed before proceeding!

4.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 ADTS and review their operation. Refer to any separate drawings and/or instructions that may be packed with the ADTS.

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 OPERATION	2 GEN-SET	3 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 least
transfer the load to the	to time out.	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 (57 Hz	terminals EA and EC (or EL1
		for a 60 Hz system.) *	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.		90% of nominal phase to
source when normal returns		---	phase voltage between
or when the Transfer Control			terminals NB and NC, NC and
switch is released.			NA, and NA and NB (or NL1
			and NL2 for 2 pole switches).
Gen. does not stop after load	Wait for Feature 2E time delay	Starting control must be in the	---
retransfer to normal source.	to time out.	automatic position.

* These are factory settings. Refer to 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 or in Canada call 1–888–234–2726. Furnish the Serial No., Catalog No., and Bill of Material (BOM) No. from the transfer switch nameplate.

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