Asco 300 Series User Manual

INSTALLATION (continued)
1 --- 5
pressthisbutton
observe these lights
Figure 1–6. Standard controls and indicators.
3 – Electrical Operation
This procedure will check the electrical opertion of the
Automatic Transfer Switch.
Close the enclosure door first !
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.
● Black circle means light is on.
❍ White circle means light is off.
NOTE: IfMotorLoadTransferfeatureis
activated, then transfer may not occur
immediately after the respective time
delays. Transf er will o nly occur when the
phase relationship between sources is
correct.
This com pletes the Functional Test of the A SCO Series 300
Automatic Transfer Switc h . Leave the engine–generator
starting control in the automatic position.
1
The normal source must be
availableandthegenerator
must be ready to start.
Check t hat the Normal Source
Accepted light is on.
Source Accepted
Normal
Emergency
2
Press and hold the Transfer Test
button until the engine starts
and runs. This should happen
within 15 sec.
Transfer
Tes t
3
The Emergency Source
Accepted light should come on.
Source Accepted
Normal
Emergency
4
The transfer switch should
transfer to the Emergency
position. The Emergency
Transfer Switch Position light
should come on and the Normal
light should go off.
Transfer Switch
Position
Normal
Emergency
5
If the transfer to emergency
delay is used the transfer
should occurs after a time delay
(up to 5 minutes).
Forimmediatetransferpress
the Bypass Time Delay button.
Bypass
Time Delay
6
The transfer switch should
transfer back to the Normal
position. The Normal Transfer
Switch Position light should
come on a nd the Emergency
light should go off.
Transfer Switch
Position
Normal
Emergency
7
If the retransfer to normal delay
is used the retransfer should
occur after a time delay
(up to 30 minutes).
Forimmediateretransferpress
the Bypass Time Delay button.
Bypass
Time Delay
8
The unloaded running delay
keeps the generator running for
5 minutes (cool–down period).
Then the generator should stop
and the Emergency Source
Accepted light should go off.
Source Accepted
Normal
Emergency

Asco 300 Series Specifications

General

Type	Automatic Transfer Switch
Poles	2, 3, 4
Enclosure Type	NEMA 1, 3R, 4, 4X, 12
Amperage Range	30-4000 Amps
Certifications	UL 1008, CSA
Operation	Automatic
Transfer Type	Open, Closed, Delayed
Control Panel	Microprocessor-based
Standards	IEEE