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SECTION 3 TESTING & SERVICE
3-- 1
PREVENTIVE MAINTENANCE
Reasonable care in preventive maintenance will i nsure
high reliability and long life for the automatic transfer
switch.
Operate the switch at least once a month.Performthis
four step Electrical Operation Test. This is a test with
load transfer.
PressuntillightFLASHES
Pressfor15Seconds
TRANSFER SWITCH TEST BYPASS TIMEDELAY 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 theEmergency
position. If th e Transfer To Emerg ency Delay is
used, the transfer w ill 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 Retr ansfer To Normal
Delay (up t o 30 minutes). For immediate
retransfer press BYPASS TIME DELAY button.
4. Unloaded Running (Engine Cooldown) Delay
allows engine to run unloaded for 5 minutes.
Clean and inspect the switch once a year. De-energize all
sources, then brush and vacuum away any excessive dust
accumulation. Remove the transfer switch barriers and
check contact condition. Replace c ontacts when pitted or
worn excessively. Rei nstall the barriers carefully.
Maintain transfer switch lubrication.Thetransfer
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 kit 75-100.
Replacement parts. Replacement parts are available in
kit form. When ordering parts provide the Serial No. and
Catalog No. from the transfer switch nameplate. Contact
your local A SCO Power Technologies sales office.
DISCONNECTING THE CONTROLLER
The harness disconnect plugs are furnished for repair
purposes only and should not have to be unplug ged. 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. IfthetransferswitchisintheNormal position, pl ace
stand b y engin e starting c on tr ol in the off position.
Then open the emergency source circuit breaker.
b. If the transfer switch i s in the Emergency position,
open the normal source circuit breaker. Place the
engine starti ng 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:
TB1 and TB3, or TB1 and TB2.
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 i s 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 i s 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 switc h is in the E mergency position,
close the normal source circuit breaker. The load will
be automatically retransferred to the normal source
after the Retr a nsf e r to Norma l Dela y . F or immediate
retransfer, press BYPASS TIME DELAY button.
Place the engine starting control in the automa ti c
position.