SECTION 2 TESTING & SERVICE
2 --- 1

TRANSFER TEST

Operate the 4000 Series ADTS at least once a month by
following the five–step Electrical Operation Transfer
Tes t procedureon page 1–7.

PREVENTIVE MAINTENANCE

Reasonable carein preventive maintenancewill insure
high reliability and long life for the 4000 Series ADTS.
An annual preventive maintenance program is recom-
mended.
ASCO Servi ces, In c. (ASI) is AS CO Power
Technologies’snational service organization. In the
US ASIcan becontacted at 1-800-800-2726 for i n-
formationon preventive maintenance agreements.
Checklist for Yearly Inspection
Hazardous voltagecapable of causing shock,
burns, or death is used in this transfer switch.
Deenergize both Normal – Emergency power
sources before performing inspections!
❐Clean the 4ADTS enclosure.Brush and vacuum
away any excessive dust accumulation.Remove any
moisture witha cleancloth.
❐Check 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.
❐Maintain transfer switch l ubrication.Ifthe
transfer switch is subjected to severe dust or
abnormal operating conditions, renew factory
lubrication on all movements a nd linkages.
Relubricate the solenoid operator if the TS coil is
replaced. Do not use oil; order lubrication kit 75-100.
❐Check all cable connections & retighten them.

REPLACEMENT PARTS

Replacementparts are availablein kit form. When or-
dering parts provide the Seri al No., Bill of Material No.
(BOM),and Catalog No. from the transfer switchname-
plate. Contact your local ASCO Power Technologies
Sales Office or ASI:

In the United States

call 1 – 800 – 800 – ASCO ( 2726 )

In Canada

call 1 – 888 – 234 – ASCO ( 2726 )

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 isolate d, follow these steps:
Disconnecting the Plugs
Do not unplug the controller
until steps 1a or 1b is completed.
1. Observe the position of the transfer switch.
a. If the transfer switch is in the Normal position, first
place standby engine starting control in the off
position. Second,then open the emergency source
circuit breaker. Third, open the normal source
circuit breaker.
b. If the transfer switch is in the Emergency position,
first open the normalsource circuit breaker. Sec-
ond, place the engine starting control in the test
orrun po sitio n. Third, open the emergency source
circuit breaker.
2. Separate the two quick di sconnectplugs by squeez-
ing the latches. Do not pull ont he harness wires.
Reconnecting the Plugs
Do not reconnect the controller
until steps 1a or 1b is completed.
1. Observe the position of the transfer switch.
a. If the transfer switch is in the Normal position,
firstbesurethatbothnormal and emergency
sourcecircuit brea kers are open. Second,be sure
that the standby engine starting control is still in
the off position.
b. If the transferswitch is in the Emergencyposit ion,
firstbesurethatbothnormal and emergency
source circuit breakers are open.
2. The two harness plugs and sockets are keyed. Care-
fully align the plugs with the sockets and press
straight in until both latches click. Closethe door!
3. Restore the two sources in sequence as follows:
a. If the transfer switch is in the Normal position,
first close the normal source circuit breaker.
Second, close the emergency so urce circuit brea k-
er. Thi rd, place the standby engine starting
control in the automatic position.
b. If the transfer switch is in the Emergency position,
first close the emergency source circuit breaker.
Second close the normal source cir cuit breaker.