Emerson 7ADTB manual TESTING & SERVICE continued, Trouble-Shooting, Maintenance Handle, Problem

TESTING & SERVICE (continued)

TROUBLE-SHOOTING

Note any optional accessories that may be furnished on the 7ADTB and review their operation. Refer to any separate drawings and/or instructions that may be packed with the 7ADTB. See Table B.

Hazardous voltage capable of causing shock,

burns, or death is used in this switch. Do not touch the power or load terminals of the bypass switch or transfer switch!

Table B. 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.
Load Disconnect Active light	Wait for load disconnect time	Explanation: Transfer switch in	delayed transition transfer mode.
comes on.	delay to time out.	Load disconnect time delay is adjustable from 0 to 5 min. 59 sec.
Load Disconnect Active light	Check load disconnect time	Explanation: Transfer switch contacts are open longer than 5
stays on longer than 6 min.	delay setting. Call ASI.	min. 59 sec (maximum setting). Load remains disconnected.

* These are factory settings. Refer to Controller’s 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.

MAINTENANCE HANDLE

Bypass and isolate the Transfer Switch before using the maintenance handle! See pages 3–1 through 3–4. Remove the maintenance handle after using it; store it inside.

1.Bypass, isolate, and withdraw the transfer switch (pages 3–1 through 3–4). Then locate and remove the maintenance handle from the clip (inside lower left side). Insert the handle onto the shaft on the left side of the operator of the transfer switch See Figures 2–1, 2–2, 2–3 and Table C.

2.Move the maintenance handle up or down as shown to manually operate the transfer switch. Operate

both upper and lower contact shafts. Observe the window indicators (right side). Remove the mainte- nance handle and store it on the lower left side.

Emergency contacts

(upper shaft)

windowcontact

indicatorsposition indicators

O is open(right side) C is closed

Normal contacts

(lower shaft)

Figure 2–1. Contact position indicators.

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