(c) Continuously monitor the temperature
seen by the thermocouple installed in paragraph 16-
22 c(l)(b) above. Record the temperature at which
theovertemperature protective device actuates. Re-
cord the temperature at which the coolant tempera-
ture indicator illuminates.
If the engine fails to shutdown when the
temperature exceeds the maximum
trip value specified in Table 16-1, the
test shall be immediately discontinued.
d. Results. Compare the results with the re-
quirement of Table 16-1.
16-23. Phase Sequence Test (Rotation)
Unless the phase sequence (rotation)
of the load terminals of a three-phase generator set
is correct, serious damage or injury could be done
to connected equipment and to personnel as a result
of reversed motor rotation or excessive current
b. Apparatus. A phase sequence (rotation) indi-
cator as described and illustrated in MIL-HDBK-705,
Method 116.1 or a three-phase motor whose direc-
tion of operation in relation to phase sequence is
known shall be required.
(1) Connect the generator set load terminals
to the applicable test applicable test apparatus for
one of the set three-phase voltage connections. Re-
check the connections to insure that
of the generator set are connected to Ll, L2 and L3
of the test apparatus respectively.
(2) Start and operate the generator set at ra-
ted voltage and frequency. The set indicating instru-
ments shall be sufficient indication of output voltage
(3) Close the circuit interrupter and determine
the direction of phase sequence (rotation) by observing
the indicator, or by noting the direction of rotation if
a three-phase motor is used.
(4) Check the phase sequence (rotation) of the
power output of each power receptacle on the genera-
tor set by connecting the applicable test apparatus to
the receptacle and repeating steps (1) thru (3) above.
(5) Repeat steps (a) thru (d) above for all
other three-phase voltage-output connections of the
d, Results. The phase sequence (rotation) as in-
dicated by the test shall be checked against the re-
quirements of Table 16-1.
16-24. Maximum Power Test.
a. General. The maximum power of a generator
setis a function of the ambient conditions (tempera-
ture and altitude) and the mechanical condition of the
engine at any particular time.
Instrumentation for measuring
load conditions, field voltage and current, pressures
and temperatures shall be as described and illustra-
ted in MIL-HDBK-705.
This procedure subjects the generator set
to a severe overload which may be damag-
ing if maintained for too long a period of
(1) Preparation for test.
(a) Connect the load and instrumentation in
accordance with the applicable figure of MIL-HDBK-
705, Method 205.1, paragraph 205.1.10 for one volt-
age and frequency.
(b) Install appropriate thermocouples to
measure the following temperatures:
1. Engine coolant (engine outlet and inlet)
2. Exhaust gas(es) (the exhaust manifolds
shall be drilled and tapped as close as
possible to the combustion chamber(s).
3. Lubricating oil sump,
4. Engine combustion air in (located at
the inlet of the intake manifold).
(c) Install appropriate pressure instrumenta-
tion to measure the following items:
1. Exhaust pressure (combined exhaust
gases in exhaust manifold).
2, Intake air manifold pressure (between
air filters and manifold).
(d) Obtain and record the barometric and
water vapor pressures (see MIL-HDBK-705, Method
(e) Bypass the set circuit interrupter.
(f) Connect the set to a source of fuel con-
taining a specified fuel required by the procurement
(a) Start and operate the generator set and
allow it to stabilize at rated load, rated voltage and
rated frequency (speed).
During this period, readings
of all instruments including thermal instrumentation
shall be recorded at minimum intervals of 10 minutes.
If necessary, adjustments to the load, voltage and
However, adjustments to the volt-
age and frequency shall be limited to those adjustments