SECTION 2 TESTING & SERVICE
TRANSFER TEST
Operate the 4000 Series ADTS at least once a month by following the
PREVENTIVE MAINTENANCE
Reasonable care in preventive maintenance will insure high reliability and long life for the 4000 Series ADTS. An annual preventive maintenance program is recom- mended.
ASCO Services, Inc. (ASI) is ASCO Power Technologies’s national service organization. In the US ASI can be contacted at
Checklist for Yearly Inspection
Hazardous voltage capable 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 with a clean cloth.
❐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.
❐Maintain transfer switch lubrication. If the transfer switch is subjected to severe dust or abnormal operating conditions, renew factory lubrication on all movements and linkages. Relubricate the solenoid operator if the TS coil is replaced. Do not use oil; order lubrication kit
❐Check all cable connections & retighten them.
REPLACEMENT PARTS
Replacement parts are available in kit form. When or- dering parts provide the Serial No., Bill of Material No. (BOM), and Catalog No. from the transfer switch name- 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 isolated, 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 normal source circuit breaker. Sec- ond, place the engine starting control in the test or run position. Third, open the emergency source circuit breaker.
2.Separate the two quick disconnect plugs by squeez- ing the latches. Do not pull on the 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, first be sure that both normal and emergency source circuit breakers are open. Second, be sure that the standby engine starting control is still in the off position.
b.If the transfer switch is in the Emergency position, first be sure that both normal 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. Close the 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 source circuit break- er. Third, 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 circuit breaker.