MIL-P-53132(ME)
TEST PROCEDURES FOR 5kW & 1OkW
POWER PLANT LOAD TRANSFER
Prior to performing the following procedures, ensure that the generator sets are in operating condition and properly serviced and that the "GND" terminal of the switchbox is connected to an earth ground.
1. The generator set located on the tongue end of the trailer is designated as the LEFT set and the other set is designated as the RIGHT set.
2. Start the LEFT set, adjust the frequency and voltage to rated values, and close the AC circuit interrupter.
3. At the switchbox, verify that the "STATUS" light for the LEFT set is illuminated and no other lights are illuminated.
4. At the switchbox, close the contactor switch for the LEFT set and observe that the LEFT set "ON LINE" light and "STATUS" light are both illuminated.
5. At this time the LEFT set is powering whatever load is connected to the switchbox output terminals. Adjust this load to rated value for a single set.
6. Record all instrument readings and verify that the load terminals on the
RIGHT set are de-energized by using a volt-ohm meter.
7. At the switchbox, open the contactor switch for the LEFT set.
8. At the LEFT set, open the AC circuit interrupter and shut the set off.
9. Start the RIGHT set, adjust the frequency and voltage to rated values, and close the AC circuit interrupter.
1O. At the switchbox, verify that the "STATUS" light for the RIGHT set is illuminated and no other lights are illuminated.
11. At the switchbox, close the contactor switch for the RIGHT set and observe that the RIGHT set "ON LINE" light and "STATUS" light are both illuminated.
12. At this time the RIGHT set is powering whatever load is connected to the switchbox output terminals. Adjust this load to rated value for a
single set.
13. Record all instrument readings and verify that the load terminals on the
LEFT set are de-energized by using a volt-ohm meter.
14. Start the LEFT set, adjust the frequency and voltage to rated value and close its AC circuit interrupter.
15. At the switchbox the following lights should be illuminated:
a. Both "STATUS" lights.
b. The "ON LINE" light for the RIGHT set.
16. At the switchbox, momentarily place the transfer switch in the "TRANSFER" position. Both synchronizing lights should start going on and off together.
If not, check wiring for proper phase sequence.
17. At the LEFT set, slowly decrease the frequency until the synchronizing lights are going off and on at a rate of once every three or four seconds (not critical).
18. Set the oscilloscope to automatically capture the transient voltages during the load transfer. At the switchbox, close the contactor switch for the LEFT set when the synchronizing lights are at their darkest. The load should automatically transfer from the RIGHT set to the LEFT set.
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