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S&C Instruction Sheet 663-590 9

Table 2

Table 2. Inspection Procedures for Pad-Mounted Gear Equipped with AT-12 Source-Transfer Control

①

—

Continued

Item Procedures

Optional overcurrent-

lockout feature (“62LR”

timer)

1. With the MANUAL/AUTOMATIC operation selector switch in the Automatic position, simulate a fault cleared by feeder fuses

by momentarily pressing the SIMULATE-OVERCURRENT test switch for the preferred source. Verify the OVERCURRENT-

LOCKOUT lamp lights for a period within ±20% of the setting on the “62LR” timer.

2. Now, simulate a lockout resulting from a fault cleared by a source-side protective device. To accomplish this, press the SIMULATE

OVERCURRENT test switch for the preferred source and confirm the OVERCURRENT-LOCKOUT lamp lights. Then, press and

hold in the associated SIMULATE-LOSS-OF-SOURCE test switch. Release the test switch when the preferred-source operator

opens and verify the alternate-source operator remains open and locked out.

3. Place the MANUAL/AUTOMATIC operation selector switch in the Manual position, and press the OVERCURRENT-LOCKOUT

RESET pushbutton to cancel the lockout condition. Confirm the OVERCURRENT-LOCKOUT lamp extinguishes. Then, close the

preferred-source operator by pressing the appropriate CLOSE pushbutton.

Before leaving the

gear…

So the AT-12 control is ready for automatic operation when leaving the site, perform the following:

1. With the MANUAL/AUTOMATIC operation selector switch in the Manual position, recouple both operators to their associated

Mini-Rupter Switches.

2. Place the MANUAL/AUTOMATIC operation selector switch in the Automatic position.

3. Confirm both source voltage lamps and the READY lamp are illuminated. (If the READY lamp is not lit, refer to the conditions

required to light the READY lamp listed on the label above the control.)

4. Close and padlock all doors.

① If the source-transfer pad-mounted gear being inspected does not oper-

ate as indicated in these inspection recommendations, refer to the AT-12

troubleshooting guide, S&C Instruction Sheet 514-520. If further assistance

is needed, contact the nearest S&C Sales Office. Have the complete catalog

number of the gear, date of shipment (as shown on the nameplate), operating

modes, and timer settings.

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