TM 55-6115-491-40
maximum deviation of the line voltage from the average
percent of rated load for two minutes. Make all readings
of the three line voltages divided by the average of the
during the last minute of the test. Line voltage shall be
three line voltages. Unbalance shall not exceed 1
200 =10 volts. Line amperage shall be 83+4 amperes.
percent. Line current shall be 55 amperes minimum, 56
KW output shall be 21.5+1.0. KVAR shall be 18
amperes maximum. Line voltages shall be 208 + 3 volts.
minimum to 20 maximum.
4-14. OVERLOAD TEST.
4-15. PM MAGNETKNOCKDOW PROCEDURE.
a. Supply cooling air as described in paragraph
4-3. Provide a means of measuring speed to within 1
switch between terminals PNand P1 as shown in figure
percent.
4.7.
b. Operate the generator at 8, 500 rpm.
c. Apply a low-level, 60-Hertz voltage for one
208 volts, 55.5 amperes, 13.25 KVA, and 15.0 KW, with
the regulator connected. Operate until the AC stator
second. Check the (+) to (-) voltage. It shall be 42 VDC
stack temperature does not increase more than 20F
maximum or 40 VDC minimum.
d. If the (+I to (-a) voltage is excessive, repeat
(1.10C) in five minutes.
c. When temperature has been stabilized,
the knockdown procedure given in step c above using a
increase the load to 200 percent of rated load for five
slightly higher setting of the variable power transformer.
seconds. Line voltage shall be 200 10 volts, line
Recheck the (+) to (-) DC voltage.
e. Repeat the procedure given in step c above if
amperage shall be 111 amperes maximum, KW shall be
27 minimum. KVAR shall be 23.5 minimum and 26.5
the DC voltage is not reduced to between 40 and 42
maximum.
VDC.
temperature condition.
Increase the load to 150
4-6