Emerson 386 manual Testing & Service, Manual Load Transfer, Trouble-Shooting, continued

TESTING & SERVICE

(continued)

MANUAL LOAD TRANSFER

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

1.Open normal and emergency source circuit breakers.

2.Use manual handle to manually operate transfer switch to the opposite source. Remove the handle. See Section 1, Manual Operation.

Do not manually operate the transfer switch until both power sources are disconnected: open both circuit breakers.

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, Optional Features.

Proceed with care! The ASCO 386 is energized.

Table 3-1. Trouble-Shooting Checks.

PROBLEM	CHECK IN NUMERICAL SEQUENCE
	1 OPERATION	2 VOLTAGE
Transfer switch does not	Turn Transfer Control switch clockwise to	Generator ouput circuit breaker must be
transfer the load to the	Transfer to Emergency position.	closed. Voltmeter should read at least 90%
emergency source.		of nominal phase to phase voltage between
		transfer switch terminals EA and EC
		(or EL1 and EL2 for 2 pole switches). *
		Generator frequency must be at least 57 Hz. *
		* These are factory settings.
Transfer switch does not	Turn Transfer Control switch counterclock-	Voltmeter should read at least 90% of nominal
transfer the load to the normal	wise to Transfer to Normal position.	phase to phase voltage between transfer switch
source.		terminals NB and NC, NC and NA,
		and NA and NB (or NL1 and NL2 for 2 pole
		switches).

Trouble-Shooting Motor Load Transfer (Optional Feature 27) (refer to page 5-1)

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 !

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.

3.Turn the TRANSFER TO EMERGENCY control switch clockwise. The load should transfer to emergency source when meter needle is near 0 volts. If transfer does not occur, the Motor Load Transfer accessory is not operating.

4.Turn the TRANSFER TO NORMAL control switch counterclockwise. The load should retransfer back to the normal source when the needle is near 0 volts. If retransfer does not occur after the time delay, the Motor Load Transfer accessory is not operating.

5.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 or ASI. In the United States, call 1–800–800–2726. Furnish the Serial No., Bill of Material (BOM) No., & Catalog No. from transfer switch nameplate.

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