MIL-P-53132(ME)
Verification of the transfer is provided by the "ON LINE" light for the LEFT set being illuminated, and the "ON LINE" for the RIGHT set not being illuminated. However, the "STATUS" light for the RIGHT set should still be illuminated.
19. At this time the LEFT set is carrying the load.
20. At the LEFT set re-adjust the frequency and voltage to the desired value
(they are probably a little bit low and will need to be increased).
21. The load can now be transferred back to the RIGHT set by proceeding as follows:
a. At the switchbox momentarily place the TRANSFER switch in the "TRANSFER" position.
b. The synchronizing lights should start going off and on together.
c. At the RIGHT set slowly increase the frequency until the synchronizing lights are going off and on at a rate of at least once a second (not critical).
d. At the RIGHT set slowly decrease the frequency until the synchronizing lights are going off and on at a rate once every three or four seconds.
e. Set the oscilloscope to automatically capture the transient voltages during the load transfer. At the switchbox close the contactor switch for the RIGHT set when the synchronizing lights are at their darkest. The load should automatically transfer from the LEFT set to the RIGHT set. Verification of the transfer is provided by the "ON LINE" light for the RIGHT set being illuminated, and the "ON LINE" for the LEFT set not being illuminated. However, the "STATUS" light for the LEFT set should still be illuminated.
22. At this time the RIGHT set is carrying the load.
23. At the RIGHT set, re-adjust the frequency and voltage to the desired value
(they are probably a little bit low and will need to be increased).
24. At LEFT set, open the set AC circuit interrupter and then stop the set.
25. At the switchbox open the contactor for the RIGHT set.
26. At the RIGHT set, open the set AC circuit interrupter and then stop the set.
Inability of the switchbox assembly to maintain or transfer a rated load shall constitute failure of this test. Failure of the generator sets to operate in accordance with the operator's manual shall not constitute failure of the test. The contracting officer shall be notified immediately of any such failure.
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