Quantcast Figure 41. Ungrounded Open on Load Circuit Manual - Ground Method Third Test

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MIL-HDBK-1023/4
(3) See Figure 41. In the second test using the manual ground method the regulator
tripped out indicating an open circuit on the load.
OK
OPEN.
SUSPECT PORTION OF CIRCUIT.
OK
= ON
MANUAL GROUND
#2
KNOWN GOOD
= DIM
KNOWN GOOD
CIRCUIT
CIRCUIT
= OFF
NOTICE!
L1
L2
GROUND CONNECTION HAS CHANGED.
ON
REGULATOR
GROUND.
IN SECOND TEST REGULATOR TRIPPED OFF DUE TO OPEN CIRCUIT. TO
PROVE THAT THE OPEN IS BETWEEN THE FIRST AND SECOND MANUAL
GROUND, WITH REGULATOR INPUT OFF, SWAP GROUND ON REGULATOR
TO L1.
Figure 41
Ungrounded Open on Load Circuit Manual - Ground Method Third Test
We have assumed that the open is between the first and present manual ground location. To
prove it, swap the intentional ground on the regulator output to the other output cable (the other
half of the load). Leave the second manual ground where it is. Energize the regulator and notice
that a portion of the load is operating. The operating portion of the load is continuous, and now
known to be good. Place a marker adjacent to the second manual ground. Now we cut this
problem in half again (see Figure 41).
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