SECTION 3 TESTING & SERVICE
3 --- 1

PREVENTIVE MAINTENANCE

Forhigh reliability and long life for the ATS:
Operate theswitch at least once a month.Performthis
4–stepElectrical Operati on Test(test with load transfer).

Transfer Switch Test

1. Press and hold the door-mounted Transfer Test
button until the engine starts and runs. This
should happen within 15 seconds.
2. Thetransfer switch will operate to the Emergency
position. If the Transfer To Emergency Delay is
used, the transfer will occur after a time delay
(upto 5 minutes). For immediate transfer press
Bypass Time Delay button.
3. The Transfer Switch will operate back to the
Normal positionafter theRetransfer 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

SClean the enclosure.De–energize all sources, then
brush and vacuum away any excessive dust
accumulation.Remove any moisturewith a clean cloth.
SCheck the transfer switch contacts.Removethe
transfer switch barri ers and check contact condition.
Replacethe contacts if they become pitted or worn
excessively. Reinstallthe barriers carefully.
SMaintain transfer switch l ubrication.Under
normaloperating conditions no further lubricating is
required. Renewfactory lubrication if the switch is
subjected to severe dust or abnormal operating
conditionsor if TS coil is replaced.Order lubrication
kit 75–100.
SCheck all cable connections & retighten them.
Torquetovaluesshownontransferswitchlabel.
Replacement parts. When ordering parts provide the
Serial and Catalog Nos. from the transfer switch name-
plate. Contact ASI. In the US call 1–800–800–ASCO
(2726).

DISCONNECTING THE CONTROLLER

The harness disconnect plugs are furnished for repair
purposes only andshould 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 s ource circuit breaker.
b. If the transfer switch is in the Emergency position,
open the normal source circuit breaker. Placethe
engine starting control in the test or run position.
2. Separate the qui ckdi sconnectplugs by squeezing the
latches. Do not pull on the harness wires.
3. Label, remove, and tape the signal wires connected
to the engine start terminalson 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 is in the Normal position, be
surethat the standby engine starting controlis still
in the off position. The emergency source circuit
breaker still should be ope n.
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 a re 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. T hen close the emergency
source circuit breaker.
b. If the transfer switch is in the Emergency position,
close the normal source circuit bre aker. The load will
be automatically retransferred to the normal source
after the Retransfer to NormalDelay. For imme diate
retransfer, press Bypass Time Delay button. Place the
engine starting control in the automatic position.