MIL-P-53132(ME)
TEST PROCEDURES
FOR 15kW, 30kW & 60kW POWER PLANT LOAD TRANSFER
Prior to performing the following procedures ensure that the generator sets are in operating condition and are properly serviced and that the "GND" terminal of the switchbox is connected to an earth ground:
1. The power unit with the switchbox is designated "A" and the other unit is designated "B".
2. Start the "A" unit, adjust the frequency and voltage to rated values, and close it's on-board AC circuit interrupter.
3. At the switchbox, the "STATUS" light for the "A" unit should be illuminated.
4. At the switchbox, close the contactor switch for the "A" unit, this should illuminate the "ON LINE" light in addition to the "STATUS" light.
5. Unit "A" is now delivering power to any load (not to exceed rating of a single set) connected to the switchbox output terminals.
6. Adjust the load to rated value.
7. Record all instrument readings and verify that the load terminals on the "B" unit are not energized by using a volt-ohm meter.
8. At the switchbox, open the contractor switch for the "A" unit.
9. At the "A" unit, open the set AC circuit interrupter and then stop the set.
10. Start the "B" unit, adjust the frequency and voltage to rated values, and close its on-board AC circuit interrupter.
11. At the switchbox, the "STATUS" light for the "B" unit should be illuminated.
12. At the switchbox, close the contactor switch for the "B" unit, this should illuminate the "ON LINE" light in addition to the "STATUS" light.
13. Unit "B" is now delivering power to any load (not to exceed rating of single set) connected to the switchbox output terminals.
14. Adjust the load to rated value.
15. Record all instrument readings and verify that the load terminals on the "A" unit are not energized by using a volt-ohm meter.
16. To transfer the load from the "B" unit to the "A" unit and then back to the
"B" unit proceed as follows:
a. Start the "A" unit and place the UNIT-PARALLEL switch in the
"PARALLEL" position. DO NOT CLOSE THE SET AC CIRCUIT INTERRUPTER SWITCH AT THIS TIME.
b. At the "B" unit place the UNIT-PARALLEL switch in the "PARALLEL" position.
c. At the switchbox, close the contactor switch for the "A" unit.
d. At the "A" unit, the two synchronizing lights should be going on and off together. If not, check wiring for improper phase sequence.
e. Slowly increase the frequency on the "A" unit until the synchronizing lights are going off and on at a rate of at least once a second.
f. Set the oscilloscope to automatically capture the transient voltages during the load transfer.
g. Slowly decrease the frequency of "A" unit until the synchronizing lights are going off and on at a rate of about once every three or four seconds (not critical). When the lights are of their darkest, close the "A"
unit set AC circuit interrupter.
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