Winco ASCO 300 E Design 260-400 Amp - Manual (Page 9)

SECTION 3 TESTING & SERVICE
3--1
PREVENTIVE MAINTENANCE
Reasonable care in preventive maintenance will ensure
high reliability and long life for the automatic transfer
switch.
Operate the switch at least once a month. Perform this
4–step Electrical Operation Test (test with load transfer).
Press until light FLASHES Press for 15 Seconds
TRANSFER SWITCH TEST BYPASS TIME DELAY SET ENGINE EXERCISER
Transfer Switch Test
1. Press and hold the door-mounted TRANSFER
SWITCH TEST button until the engine starts and
runs. This should happen within 15 seconds.
2. The transfer switch will operate to the Emergency
position. If the Transfer To Emergency Delay is
used, the transfer will occur after a time delay
(up to 5 minutes). For immediate transfer press
BYPASS TIME DELAY button.
3. The Transfer Switch will operate back to the
Normal position after the Retransfer To Normal
Delay (up to 30 minutes). For immediate
retransfer press BYPASS TIME DELAY button.
4. Unloaded Running (Engine Cooldown) Delay
allows engine to run unloaded for 5 minutes.
Checklist for Yearly Inspection
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Clean the enclosure. De–energize all sources, then
brush and vacuum away any excessive dust
accumulation. Remove any moisture with a clean cloth.
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Check the transfer switch contacts. Remove the
transfer switch barriers and check contact condition.
Replace the contacts if they become pitted or worn
excessively. Reinstall the barriers carefully.
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Maintain transfer switch lubrication. The transfer
switch has been properly lubricated, and under
normal operating conditions no further lubricating is
required. Renew factory lubrication if the switch is
subjected to severe dust or abnormal operating
conditions. Relubricate the operator if TS coil is
replaced. Order lubrication 625550–001 (Castrol
EndurexR 4000 lubricant).
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Check all cable connections & retighten them.
Torque to values shown on transfer switch label.
DISCONNECTING THE CONTROLLER
The harness disconnect plugs are furnished for repair
purposes only and should not have to be unplugged. If the
controller must be isolated, follow these steps carefully.
Disconnecting the Plugs
Do not unplug the controller until step
1a. or 1b. below is completed.
!
1. Observe the position of the transfer switch.
a. If the transfer switch is in the Normal position, place
standby engine starting control in the off position.
Then open the emergency source circuit breaker.
b. If the transfer switch is in the Emergency position,
open the normal source circuit breaker. Place the
engine starting control in the test or run position.
2. Separate the quick disconnect plugs by squeezing the
latches. Do not pull on the harness wires.
3. Label, remove, and tape the signal wires connected
to the engine start terminals on the transfer switch:
TB14 and TB15, or TB14 and TB16.
Reconnecting the Plugs
Do not reconnect the controller until step
1a. or 1b. and 2 below are completed.
!
1. Observe the position of the transfer switch.
a. If the transfer switch is in the Normal position, be
sure that the standby engine starting control is still
in the off position. The emergency source circuit
breaker still should be open.
b. If the transfer switch is in the Emergency position,
normal source circuit breaker still should be open.
2. Reconnect the signal wires connected to the
appropriate engine start terminals on the transfer
switch. See Section 1, Engine Starting Contacts.
3. The harness plugs and sockets are keyed. Carefully
align the plugs with the sockets and press straight in
until both latches click.
4. Restore the opposite source as follows:
a. If the transfer switch is in the Normal position,
place the standby engine starting control in the
automatic position. Then close the emergency
source circuit breaker.
b. If the transfer switch is in the Emergency position,
close the normal source circuit breaker. The load will
be automatically retransferred to the normal source
after the Retransfer to Normal Delay. For immediate
retransfer, press BYPASS TIME DELAY button.
Place the engine starting control in the automatic
position.