ARMY TM 9-6115-464-34
AIR FORCE 35C2-3-445-2
NAVY NAVFAC P-8-624-34
(6) Inspect resistors and capacitors of electronic components assembly for insecure mounting and burns
or other evidence of shorting.
(7) Inspect terminal board assembly for cracks, corroded terminals, damaged terminal jumpers and
evidence of shorting.
(8) Test under voltage relay as follows:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
Install relay in test circuit shown in figure 3-124.
Activate power source G1 and adjust output voltage to 120 Vac at 50 HZ.
Activate power source G2.
Close switches S1 and S2.
Test lamp DSI shall illuminate, and test lamp DS2 shall remain extinguished.
Vary output frequency of power source G1 from 50 to 450 HZ. There shall be no change in test
lamp illumination.
Slowly decrease output voltage of power source G1 to 100 Vac. Vary output frequency from 350 to
450 Hz. Test lamp DSI shall remain illuminated and test lamp DS2 shall remain extinguished.
Slowly decrease output voltage of power source G1 to 95 Vac. Vary frequency from 50 to 100 HZ.
DS1 shall remain illuminated and DS2 shall remain extinguished.
Set output frequency of power source G1 to 50 Hz. Slowly decrease output voltage of power
source G1 to 90 Vac. Test lamp DS1 shall extinguish and test lamp DS2 shall illuminate. Set output
frequency above 95 Vac and momentarily open switches S1 and allow relay to reset.
Repeat steps (i) for frequencies of 60,70, and 100 Hz.
Set output frequency of power source G1 to 350 Hz. Slowly decrease output voltage to 90 Vac.
DS1 shall extinguish and DS2 shall illuminate. Return output frequency to 120 Vac and
momentarily open switch S1, allowing relay to reset.
Repeat step (k) for output frequency of 400 and 450 Hz.
(9) Test under frequency relay as follows:
(a) Install relay in test circuit shown in figure 3-125.
(b) Activate power source G1 and G2 and adjust output frequency to 50 Hz (400 Hz for 400 Hz units).
(c) Close switch S1. Test lamp DS1 shall illuminate and DS2 shall remain extinguished.
(d) Lower output frequency of power source G1 until test lamps transfer. Test lamp shall transfer at 46
± 1 Hz (370 Hz for 400 Hz units).
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