Filter
Top Products
SECTION 3 TESTING & SERVICE
3 --- 1
PREVENTIVE MAINTENANCE
For high reliability and long life for the ATS:
Operate the switch at least once a month.Performthis
4–step Electrical Operation Test (te st 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. The transfer switch will operate to the Emergency
position. If the Trans fer To E m erg ency Del ay is
used, the transfer will occur after a time delay
(up to 5 minutes). For immediate transfer press
Bypas s Time D elay button.
3. The Transfer Switch w ill operate back to the
Normal position after the R etrans fer To Nor mal
Delay (up to 30 minutes). For immediate
retransfer press Bypas s Time D elay button.
4. Unloaded Running (Engine Cooldown) Delay
allows engine to run unloaded for 5 minutes.
Checklist for Yearly Inspection
S Clean the enclosure. De–energize all sources, then
bru s h and vacuu m aw ay any exces sive d u st
acc u m ul ation. Remove any moisture with a clean c l oth.
S Check the transfer switch contacts.Removethe
transfer switch barriers and check contact condition.
Replace the contacts if they become pitted or worn
excessively. Reinstall the barriers carefully.
S Maintain transfer switch lubrication.Under
normal operating conditi ons no further lubricating is
required. Renew factory lubrication if the switch is
subjected to severe dust or abnormal operating
conditions or ifTS coilis replaced. Orderlubrication
kit 75–100.
S Check 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 and should not have to be unplugg ed. If the
controller must b e isolated, follow these steps c arefully.
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 s w itc h is in the Normal position, place
stand b y eng ine start ing c o ntr o l 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:
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 positi on, be
sure that the standby engine starting control i s 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 t he 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 tran sfer switc h is in the Emergency position,
close the normal source circuit breaker. The load will
be automatically retransferred to t he norm al source
after the Re tra nsf e r to Nor m a l Delay . F or immediate
retransfer, press Bypass T ime Delay button. Place the
engine st arting control in the autom atic position.