ARMY TM 9-6115-604-12
NAVY NAVFAC P 8 633-12
NOTE
If replacement is needed, FREQUENCY meter M103 and frequency transducer A103 are
a matched set and should be replaced as a unit.
4-100. AC KILOWATTS METER M107 (6, Figure 2-2). AC KILOWATTS meter M107 Indicates the power output of the
generator set.
a.
Adjust With generator set shut down, check that AC KILOWATTS meter M107 Indicates at zero-adjust point
marked on the face of the meter. If necessary, adjust the screw on the face of the meter to align the needle with
the mark.
b.
Test.
(1) Start the generator set and place In SINGLE SET operation mode with constant output applied to available
and stable load.
(2) Monitor kilowatt output on AC KILOWATTS meter M107 and record.
(3) Monitor current output on AC AMPERES meter M102 and record.
(4) Set GEN/BUS VOLTMETER switch S112 to any GEN position and record voltage output on AC KILOVOLTS
meter M1 01.
(5) Monitor power factor on POWER FACTOR meter M104 and record.
(6) Determine accuracy and serviceability of AC KILOWATTS meter M107 by calculation. Using the 3 phase
power equation P = E x square root of 3 pf, substitute the values obtained In steps (3) through (5), above,
and determine theoretical kilowatt output in watts.
(7) Compare the kilowatt output obtained In step (2), above, and the theoretical kilowatt output calculated in step
(6), above. The kilowatt output of AC KILOWATTS meter M107 should be within ± 5 percent of the
calculated kilowatt output.
(8) If kilowatt output of AC KILOWATTS meter Ml 107 varies by more than i 5 percent, AC KILOWATTS meter
M107 or WMT transducer may require replacement. The meter movement requires one milliampere DC for
full scale meter deflection.
c.
Remove. See Figure 4-66.
(1) Open cabinet B door. Tag and disconnect wiring from AC KILOWATTS meter M107 (5).
(2) Remove mounting screws and remove AC KILOWATTS meter M107 (5) from cabinet B door.
d.
Install
(1) Install and secure AC KILOWATTS meter M107 (5) in cabinet B door
(2) Connect wiring and discard tags. Close cabinet B door.
(3) Test again in accordance with step b, above If meter also fails test, refer problem to the next higher level of
maintenance for replacement of wattmeter transducer WMT
4-101. AC KILOVARS METER M108 (7, Figure 2-2). AC KILOVARS meter M108 indicates kilovar load on the
generator G1.
a.
Adjust. With generator set shut down, check that needle on AC KILOVAR meter M1 08 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 the generator set and place in SINGLE SET operation mode with stable load.
(2) Monitor kilovar output on AC KILOVARS meter Ml 08 and record.
(3) Monitor kilowatt output on AC KILOWATTS meter M107 and record.
(4) Monitor power factor on POWER FACTOR meter M104 and record.
(5) Determine accuracy and serviceability of AC KILOVARS meter M108 by calculation. Using the equation
KVA = KW/pf, substitute the values obtained in steps (3) through (4), above, and determine theoretical
kilovar amperes.
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