Emerson 7ATB manual Testing & Service, Transfer Test, Preventive Maintenance, Replacement Parts

SECTION 2 TESTING & SERVICE

TRANSFER TEST REPLACEMENT PARTS

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 con- trol (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 by- passed before the test. See pages 3–1 and 3–2 for by- passing & isolating instructions 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–stepElectrical Operation – Transfer Test procedure on page 1–4.

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’ national service organization. ASI can be contacted at 1–800–800–2726 for informa- tion 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!

SClean the ATB enclosure. Brush and vacuum away any excessive dust accumulation. Remove any moisture with a clean cloth.

SCheck 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.

SMaintain transfer switch lubrication. If switch is subjected to severe dust or abnormal operating conditions, renew factory lubrication on all move- ments and linkages. Relubricate solenoid operator if TS coil is replaced. Don’t use oil; order lubrica- tion kit 75-100.

SCheck all cable connections & retighten them.

Replacement parts are available in kit form. When ordering parts provide the Serial No., Bill of Material No. (BOM), and Catalog No. from the transfer switch nameplate. For service call ASCO Services at 1–800–800–2726.

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:

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. Carefully 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.

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