S&C PMH Inspection Manual

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 ▶

S&C PMH Specifications

General

Brand	S&C
Model	PMH
Category	Controller
Language	English