Testing & Service - Emerson Asco 7000 Series Operator's Manual

TRANSFER TEST
Test the Automatic Transfer Switch portion of the 7000
Series ATB at least once a month. This procedure checks
the electrical operation of the Transfer Switch and
Controller. Put the engine–generator starting control (at
the engine–generator set) in automatic mode.
In the following test the generator will start, the load will
be transferred to the Emergency source, then back to the
Normal source. An interruption to the load will occur,
unless the the Transfer Switch contacts are bypassed be-
fore the test. See page 3–1 for bypassing & isolating in-
structions if no interruption of load is required.
!
Be sure to close the enclosure door
before proceeding to prevent personal injury
in case of electrical system fault.
Perform the five–step Electrical Operation --- Transfer
Test procedure on page 1–7.
PREVENTIVE MAINTENANCE
Reasonable care in preventive maintenance will insure
high reliability and long life for the 7000 Series ATB. An
annual preventive maintenance program is recom-
mended.
ASCO Services, Inc. (ASI) is ASCO Power
Technologies's national service organization. ASI
can be contacted at 1-800-800-2726 (ASCO) for in-
formation on preventive maintenance agreements.
Checklist for Yearly Inspection
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Deenergize both Normal -- Emergency power
sources before performing inspections!
j Clean the ATS enclosure. Brush and vacuum away
any excessive dust accumulation. Remove any mois-
ture with a clean cloth.
j Check the transfer switch contacts. Remove
transfer switch barriers and check the condition of
the contacts. Replace contacts when pitted or worn
excessively. Reinstall the barriers carefully.
j Maintain transfer switch lubrication. If switch is sub-
jected to severe dust or abnormal operating conditions,
renew factory lubrication on all movements and link-
ages. Relubricate solenoid operator if TS coil is re-
placed. Don't use oil; order lubrication kit 75-100.
j Check all cable connections & retighten them.
SECTION 2 TESTING & SERVICE
2--1
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 Technolgies 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 control panel must be isolated, follow these steps:
Bypass-- Isolation Switch is energized!
Do not touch isolation contact fingers;
shock, burns, or death could result!
Disconnecting the Plugs
1. Bypass and Isolate the Automatic Transfer Switch.
2. Open the upper enclosure door.
3. Separate the two quick disconnect plugs by squeez-
ing the latches. Do not pull on the harness wires.
Reconnecting the Plugs
1. The ATS should be still bypassed and isolated.
2. The two harness plugs and sockets are keyed. Care-
fully align the plugs with the sockets and press
straight in until the latches click.
3. Close the enclosure doors.
4. Follow Return to Service instructions on page 3–3.