MIL-DTL-6162C
Test Voltage
Test Time
500 VDC + 5 VDC
1 Minute
600 VDC + 6 VDC
1 Minute
4.6.3 No load speed. If applicable, the machine shall be operated as a starter, at no lead and with the power
source specified in the associated specification sheet. The maximum speed attained during no load motor operation
shall be in excess of the specified minimum cutout speed and shall not result in self-destruction of the unit.
4.6.3.1 Series start. Machines used as series motors shall meet the no load speed requirement with the
generator shunt field disconnected.
4.6.3.2 Shunt start. Machines which utilize the generator shunt field during the start cycle shall meet the no
load speed requirement with the shunt field terminal (A) connected directly to the positive input terminal. Unless
otherwise specified, no series resistance shall be used in the field circuit.
4.6.4 Maximum speed for regulation. Prior to warm-up, the machine operating as a generator, with a manually
controlled variable resistance in the field circuit, shall be accelerated from zero rpm to the maximum speed for
regulation specified on the associated specification sheet. Unless otherwise specified in the associated specification
sheet, the unit shall deliver no more than rated voltage at no load with 35 ohms or less in the field circuit (see
4.6.11).
4.6.5 Minimum speed for regulation. The machine, operating as a generator, shall be temperature stabilized at
rated load after warm-up and shall be reduced from the continuous operating speed to the minimum speed for
regulation specified on the associated specification sheet. Unless otherwise stated in the associated specification
sheet, the unit shall provide rated voltage at full load, with no less than 1.25 ohms in the field circuit.
4.6.6 Field temperature. The machine shall be operated as a generator at rated voltage and full load current and
at the following speeds specified on the associated specification sheet (see 4.6.18.3; 4.6.20; 4.6.21; 4.6.21.8;
4.6.21.9; 4.6.22.1; and 4.6.22.3).
4.6.6.1 Maximum speed for regulation.
4.6.6.2 Continuous operating speed. (Strip chart or equivalent record shall show a minimum of 90 minutes of
operation after temperature stabilization at this speed.)
4.6.6.3 Minimum speed for regulation.
4.6.6.4 Minimum rated speed. (26 volts minimum and full load.) Temperature stabilization must occur at each
speed with no indication of thermal runaway. The temperature attained shall not be cause for rejection provided all
other requirements of the specification are met and component temperature limits are not exceeded.
4.6.7 Commutation (brush type machines). Immediately following the minimum speed run of the field
temperature test (see 4.6.2) and while the machine is temperature stabilized, the commutation shall be observed over
the speed range for rated load, half load, and no load. There shall be no more than number 1¼ sparking as shown in
Figure 5 (see 4.6.11; 4.6.20; 4.6.21.9; and 4.6.21.11).
4.6.8 Equalizing voltage. The machine shall be operated as a generator at continuous operating speed, rated
voltage, and rated load with blast cooling, if applicable, supplied in the amount indicated in Figure 6. Upon
temperature stabilization, the equalizing voltage shall be measured between terminals D and E. Unless otherwise
specified, the equalizing voltage shall be 2.0 ± 0.1 volts. The equalizing voltage-cooling air temperature chart
furnished by the manufacturer shall be substantiated by measuring the voltage at three random temperatures between
5° to + 45° C (-41° to +113° F).
4.6.9 Shunt field excitation.
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