TM 5-6115-465-34
T0 35C2-3-446-2
NAVFAC P-8-625-34
TM 06858B/06859D-34
(i) The generator set contains an over-
b. Apparatus. Instrumentation for measuring
voltage malfunction indicator; check and record its
voltage and frequency shall be as described and illus -
indication.
t rated in MI L-HDBK-705. Resistors), galvanometers
matching networks, an oscillogram (as described and
illustrated in MIL-HDBK-705, Method 106.1, para-
(j) Record whether or not the set shuts
graph 106. 1.3 ) and galvanometers having a minimum
down.
flat frequency response (flat within plus or minus 5
percent) from DC to 3000 Hertz and the voltage divid-
(k) Open the stitch, reset the overvoltage
er transformer network will be required.
circuit if necessary, restart the set if required, and
close the circuit interrupter.
c.
Procedure I. (Overvoltage).
(1) Repeat steps (e) thru (k) above two
(1) Preparation for test.
additional times.
(a) Locate and disconnect the input circuit
d.
Procedure II (Undervoltage).
to the input terminals of the overvoltage protective
sensing circuit and connect the apparatus as illustra-
(1) Preparation for test.
ted in figure 512.3-I for one voltage connection.
(a) Locate the input terminals of the under-
(b) Connect the frequency meter to the out-
voltage sensing circuit and connect the apparatus as
put terminals of the generator set.
illustrated in figure 512.3-I.
(2) Test.
(b) Repeat step (b) of para. 7-20c. (l)(b).
(2) Test.
(a) Start and operate the set at rated fre-
quency and no load.
(a) Start and operate the set at rated fre-
quency and no load.
(b) Close the switch (see figure 512.3-I)
and use resistance, RI to adjust the voltage to the over-
(b) Close the switch (see figure 512.3-I) and
voltage value specified in table 7-1. The set has pro-
use the resistance, RI, to adjust the voltage to the
visions for shutdown upon an overvoltage condition. It
rated value.
will be necessary to temporarily deactivate this pro-
vision to permit adjustment of the overvoltage value.
(c) Open the switch and adjust the resis-
This may be done by activation of the "protective by-
tance, R2, until Voltmeter No. 2 reads the under-
pass" (Battle Short ) switch. Do not deactivate the cir-
cuit interrupter trip circuitry.
voltage value specified in table 7-1. This test shall
be repeated for each undervoltage value.
(c) Open the switch, reset the overvoltage
circuit and adjust the resistance, R2, until voltmeter
(d) Repeat steps (b) and (c) above to assure
No. 2 reads rated voltage.
that the specified undervoltage and rated voltage sett-
ings are correct.
(d) Repeat (b) and (c) to assure that the
specified overvoltage and rated voltage settings are
(e) Set the oscillograph chart speed such
correct.
that the individual waveform peaks are clearly visible.
Set the timing lines to a minimum of 0.01 seconds per
(e) Set the oscillograph chart speed such
line or use a 60 Hertz timing trace. With the switch
that the individual waveform peaks are clearly visible.
open, adjust the trace peak-to-peak amplitude to a
Set the timing lines to a minimum of 0.01 seconds per
minimum of one inch (or 25 millimeters).
line or use a 60 Hertz time trace. Adjust the trace
peak-to-peak amplitude to a minimum of one inch (or
(f) With the set operating and the circuit
25 millimeters).
interrupter and the switch open, read and record both
voltmeter readings.
(f) Read and record both voltmeter read-
ings.
(g) Close the switch and circuit interrupter.
(h) With the oscillograph recording, open
(g) With the oscillograph recording and the
the switch.
circuit interrupter closed, close the switch. (See
figure 512.3-1).
(i) After allowing sufficient time for the
circuit interrupter to operate, check and record the
(h) Reactivate the shutdown provision if
indication of the undervoltage malfunction indicator.
used.
7-14
