terminals of a 3 phase generator set
is correct, serious damage or injury
equipment and to personnel as a
result of reversed motor rotation or
excessive current surges.
Apparatus. A phase sequence (rotation)
indicator as described and illustrated in MIL-
HDBK-705, Method 116.1 or a 3 phase motor
whose direction of operation in relation to phase
sequence is known shall be required.
Connect the generator set load terminals
to the applicable test apparatus for one of
the set 3 phase voltage connection.
Recheck the connections to ensure that
L1, L2, and L3 of the generator set age
connected to L2, and L3 of the test
Start and operate the generator set at
rated voltage and frequency. The set
indicating instruments shall be sufficient
Close the circuit interrupter and determine
the direction of phase sequence (rotation)
by observing the indicator, or by noting he
direction of rotation if a 3 phase motor is
used. Record results.
Repeat steps (a) through (d) above for all
other 3 phase voltage output connections
of the generator set.
Phase sequence can also be checked by
placing PHASE SEQUENCE-BUSS-OFF-
GEN switch, located on the generator
panel, to the GEN position and the 1-3-2
lamp should illuminate.
Place the AC PWR CKT BKR, located on
the generator panel, to the close position
and the PHASE SEQUENCE-BUSS-OFF-
GEN switch to the BUSS position. The 1-
3-2 lamp should illuminate.
Results. The phase sequence (rotation) as
indicated by the test shall be checked against
the requirements of table 16-1.
16-24. MAXIMUM POWER TEST.
General. The maximum power of a generator
set is a function of the ambient conditions
(temperature and altitude) and the mechanical
condition of the engine at any particular time.
See table 16-1 for test parameters for various
Apparatus. Instrumentation for measuring load
conditions, field voltage and current, pressures
and temperatures shall be as described and
illustrated in MIL-HDBK-705.
generator set to a severe overload
maintained for too long a period
Preparation for test.
instrumentation in accordance with
the applicable figure of MIL-HDBK-
Install appropriate thermocouples to
1. Engine coolant (engine outlet
manifold(s) shall be drilled