6
S&C Instruction Sheet 663-590
Table 1
Table 1. Inspection Procedures for Pad-Mounted Gear Equipped with Micro-AT Source-Transfer Control
①
Item
Procedures
Switch operators
1 . Place the MANUAL/AUTOMATIC operation selector switch on the Micro-AT control in the
Manual position and decouple both
operators from their associated Mini-Rupter Switches . (Switching operations will result in temporary service interruptions if the
operators are coupled .)
2 . Open the preferred-source operator by pressing the appropriate OPEN pushbutton . After opening, the operator should recharge in
less than 35 seconds .
3 . Close the alternate-source operator by pressing the appropriate CLOSE pushbutton . This operator should also recharge in less
than 35 seconds .
4 . Each switch operator should be given an exercise consisting of five or more power-operated operations unless normal operating
duty provides equal or greater exercise .
5 . Return both operators to their original positions (preferred closed; alternate open) .
Clock
1 . Press the <Time> menu key on the Micro-AT control . Then, press the <Last> item key . The “HH:MM:SS” (hour:minute:second)
item will appear on the display . If necessary, reset the time as directed below .
2 . To reset the time, first press the <Change> key . After that, press each digit of the access-code number and the <Enter> key .
Press the number keys corresponding to the desired value, and press the <Enter> key again .
Lamps, display, and
keypad
1 . Press the <Test> menu key on the Micro-AT control . Then, press the <Next> item key . The
Test Lamps item will appear on the
display . Press the <Enter> key and confirm the lamps on the control flash a total of five times .
2 . Press the <Next> item key again . The
Test Display item will appear on the display . Press the <Enter> key, and confirm all dot
segments comprising the characters of the display alternately appear black and then disappear a total of five times .
3 . Press the <Next> item key again . This time the
Test Keypad item will appear on the display . Press the <Enter> key . Now
individually press all the keys on the control and verify the value or name of each key pressed appears on the display . When
finished, press the <Quit> key .
Transfer on loss of
source and return of
source
1 . While still in the text menu, press the <Next> item key one more time . The
Enable Test Keys item will appear on the display .
Press the <Change> key . Then, select
On mode by pressing the <Enter> key . The test keys are now enabled for 15 minutes .
2 . Place the MANUAL/AUTOMATIC operation selector switch in the
Automatic position .
3 . If the Micro-AT control has been programmed for automatic return:
a . Simulate a prolonged loss of preferred-source voltage by pressing and holding in the <Loss of Voltage> key for the left source
or right source, as appropriate . Verify the time to initiate transfer is the same as the loss-of-source time delay programmed into
the control for the preferred source . Also confirm the associated source voltage lamp extinguishes and that the switch operator
targets correctly indicate an
Open or Closed position .
b . Now, release the <Loss of Voltage> key to simulate a return of the preferred-source voltage . Verify the time to initiate back
transfer is the same as the return-of-source time delay programmed into the control . Confirm the associated source voltage
lamp relights . Verify the switch operator targets’ positions .
4 . If the Micro-AT control has been programmed for
Hold Return mode:
a . Simulate a prolonged loss of preferred-source voltage by pressing and holding in the <Loss of Voltage> key for the left source
or the right source, as appropriate . Verify the time to initiate transfer is the same as the loss-of-source time delay programmed
into the control for the preferred source . Also confirm the associated source voltage lamp extinguishes and that the switch
operator targets correctly indicate an
Open or Closed position .
b . Release the <Loss of Voltage> key to simulate a return of the preferred-source voltage, and wait a sufficient length of time to
verify back transfer does not occur . Confirm the associated source voltage lamp relights .
c . Now, simulate a loss of alternate-source voltage by pressing and holding in the <Loss of Voltage> key for the left source or the
right source, as appropriate . Verify the time to initiate back transfer is the same as the loss-of-source time delay programmed
into the control for the alternate source . Confirm the associated source voltage lamp extinguishes, and then release the <Loss
of Voltage> key . Verify the switch operator targets’ positions .
5 . Return the MANUAL/AUTOMATIC operation selector switch to the
Manual position .
TABLE CONTINUED
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