Emerson 400A manual Electrical Operation

INSTALLATION (continued)

observe these lights

press this button

Figure 1–6. Standard controls and indicators.

3 – Electrical Operation

This procedure will check the electrical operation of the Automatic Transfer Switch.

Close the transfer switch enclosure door and tighten the screws before you test electrical operation.

Transfer Test

Both normal and emergency sources must be available and the emergency source generator (if used) must be capable of being started in this procedure.

Perform steps 1 through 8 at the right. Observe the status lights. See Figure 1–6.

OBlack circle means light is on. P White circle means light is off.

NOTE: If Motor Load Transfer feature is activated, then transfer may not occur immediately after the respective time delays. Transfer will only occur when the phase relationship between sources is correct.

This completes the Functional Test of the ASCO Series 300 Automatic Transfer Switch. Leave the engine–generator starting control in the automatic position.

	The normal source must be
	available and the generator	Source Accepted
1 must be ready to start.		Normal
	Check that the Normal Source
		Emergency
	Accepted light is on.
	Press and hold the Transfer Test
2	button until the engine starts	Transfer
	and runs. This should happen	Test
	within 15 sec.
3	The Emergency Source	Source Accepted
	Accepted light should come on.	Normal
		Emergency
	The transfer switch should
	transfer to the Emergency	Transfer Switch
4	position. The Emergency	Position
	Transfer Switch Position light	Normal
	should come on and the Normal	Emergency
	light should go off.
	If the transfer to emergency
	delay is used the transfer
5	should occurs after a time delay	Bypass
	(up to 5 minutes).	Time Delay
	For immediate transfer press
	the Bypass Time Delay button.
	The transfer switch should
	transfer back to the Normal	Transfer Switch
6	position. The Normal Transfer	Position
	Switch Position light should	Normal
	come on and the Emergency	Emergency
	light should go off.
	If the retransfer to normal delay
	is used the retransfer should
7	occur after a time delay	Bypass
	(up to 30 minutes).	Time Delay
	For immediate retransfer press
	the Bypass Time Delay button.
	The unloaded running delay
	keeps the generator running for	Source Accepted
8	5 minutes (cool–down period).	Normal
	Then the generator should stop
	and the Emergency Source	Emergency
	Accepted light should go off.

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