TM 5-6115-465-34
T0 35C2-3-446-2
NAVFAC P-8-625-34
TM 06858B/06859D-34
(e) Slowly open the bleeder valve until
(j) Close the switch and close the circuit
the low oil pressure protective device shuts down the
interrupter.
engine. Record the reading of the oil pressure gauge
at the point of set shutdown (see figure 515. l-II).
(k) Repeat steps (e) thru (j) above two
additional times.
(f) Record operation of the malfunction
indicator light.
(l) Repeat (a) thru (k) for the other under-
d. Results. Compare the value of shutdown
pressure with the requirement of table 7-1.
e.
Results.
7-22.
OVERTEMPERATURE PROTECTIVE
(1) From the oscillograms made in 7-20c. de-
DEVICE TEST.
termine and tabulate the time between the application
of the overvoltage and operation of the circuit inter-
a. General. The overtemperature device must
rupter for each application of overvoltage.
be capable of protecting the engine in the set against
overheating for any reason.
(2) From the oscillograms made in 7-20d. de-
termine and tabulate the time between the application
of the undervoltage and the operation of the circuit
load conditions and set and ambient temperatures
interrupter for each application of undervoltage.
shall be as described and illustrated in MIL-HD13K-
705, Method 205.1, Paragraph 205.1.10.
(3) Compare these results with the require-
c.
Procedure.
7-21.
LOW OIL PRESSURE PROTECTIVE DEVICE
(1) Preparation for test.
TEST.
a. General. Since generator sets frequently
operate unattended for long periods, the engine is
accordance with the applicable figure of MIL-HDBK-
705, Method 205.1, Paragraph 205.1.10.
equipped with a low oil pressure protective device.
This device shuts down the engine when the oil pres-
sure drops below the safe limit.
(b) Install a thermocouple to measure the
same temperature as seen by the protective device
sensor.
b. Apparatus. The following equipment shall
be required to perform this test.
(2) Test.
Oil pressure gauge ( + 1%)
Flexible oil line (or copper tubing)
(a) Start and operate the generator set at
rated voltage, rated frequency (speed), and rated load.
Regulating valves
Brass fittings.
set by any suitable means.
c.
Procedure.
(c) Continuously monitor the temperature
(1) Preparation for test. With the set not
seen by the thermocouple installed in paragraph 7-
operating, remove the protective device tap from the
22c. (1)(b) above. Record the temperature at which
engine block and reconnect as shown in figure 515. 1-1
the overtemperature protective device actuates. Re-
with the protective device and oil pressure gauge in
cord the temperature at which the coolant tempera-
approximately the same horizontal plane as the pro-
tective device tap located on the engine.
ture indicator illuminates.
(2) Test.
CAUTION
(a) With the bleeder valve closed and the
If the engine fails to shutdown when the
shut-off valve in the oil pressure line open, start and
temperature exceeds the maximum trip
operate the set at rated speed (use the set instrumen-
tation) and at no load.
be immediately discontinued.
(b) Open the bleeder valve slightly to purge
d. Results. Compare the results with the re-
air from the system.
(c) Close the bleeder valve and record the.
7-23.
PHASE SEQUENCE TEST (ROTATION).
oil pressure as indicated on the external gauge.
d. General. Unless the phase sequence (rotation)
(d) Almost completely close the shut-off
valve.
of the load terminals of a three-phase generator set is
7-15