ARMY TM 9-6115-604-12
NAVY NAVFAC P 8 633-12
(6) Using the equation KVAR = the square root of (KVA2 - KW2), substitute the values obtained in steps (3) and
(5), above, and determine theoretical kilovar output.
(7) Compare the kilovar output obtained in step (2), above, and the theoretical kilovar output calculated in steps
(5) and (6), above. The kilovar output of AC KILOVARS meter M108 should be within 5 percent of the
calculated kilovar output.
(8) If kilovar output of AC KILOVARS meter M108 varies by more than ± 5 percent, replace AC KILOVARS
meter M108.
c.
Remove. See Figure 4-66.
(1) Open cabinet B door. Tag and disconnect wiring from AC KILOVARS meter M108 (6).
(2) Remove mounting screws and remove AC KILOVARS meter M108 (6) from front of cabinet B door.
d.
Install See Figure 4-66.
(1) Install AC KILOVARS meter M108 (6) and secure in cabinet B door.
(2) Connect wiring as tagged and discard tags.
(3) Test AC KILOVARS meter M108 again as in step b, above. If AC KILOVARS meter M108 fails test again,
refer to paragraph 4-143 and test INSTRUMENT CURRENT transformers CT10 through CT12.
4-102. POWER FACTOR METER M104 (9, Figure 2-2). POWER FACTOR meter M104 indicates the power factor of
the load on generator G1.
a.
Adjust. Adjust with generator set shut down. Check that needle on POWER FACTOR meter M104 indicates at
zero-adjust point marked on face of meter If necessary, adjust the screw on the face of the meter to align the
needle with the mark.
b.
Test.
(1) Start generator set, place in SINGLE SET operation mode and connect to a stable load.
(2) Monitor current output on AC AMPERES meter M102 and record.
(3) Set GEN/BUS VOLTMETER switch S112 to any GEN position and record voltage output on AC KILOVOLTS
meter M101.
(4) Substitute the values obtained In steps (2) and (3), above, and determine theoretical kilovar-amperes using
the equation KVA=V A 3
1000
(5) Monitor power factor on POWER FACTOR meter M104 and record
(6) Monitor kilowatt output on AC KILOWATT meter M107 and record.
(7) Determine accuracy and serviceability of POWER FACTOR meter M104 by calculation. Using the equation
pf = KW/KVA, substitute the values obtained in steps (4) and (6), above, and determine theoretical power
factor. The meter movement requires plus and minus 0 5 milliamperes DC for full scale deflection.
c.
Remove. See Figure 4-66.
(1) Open cabinet B door. Tag and disconnect wiring from POWER FACTOR meter M104 (7).
(2) Remove attaching hardware and remove POWER FACTOR meter M104 (7) from front cabinet B door.
d.
Replace. See Figure 4-66.
(1) Install POWER FACTOR meter M104 (7) and secure In cabinet B door.
(2) Connect wiring and discard tags. Close cabinet B door.
(3) Test again In accordance with step b, above. If test falls, notify higher level maintenance that power factor
transducer PFT requires testing and possibly replacement.
4-167
