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Peak starting current and decay time |
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|  MIL-I-19028E(OS)
4.4.5.1.2.8 Commutation. Observe the sparking which occurs between
the motor commutator and the brushes. If only fine pinpoint sparking
is noted, record the commutation as "satisfactory". If more than fine
sparks are noted, record the commutation as unsatisfactory. For this
test, remove the end bell so that the brushes can be observed.
4.4.5.1.3 Peak starting current and decay time. Connect the current
shunt (4.4.3.10) in the input circuit and connect the oscilloscope
(4.4.3.7) to the voltage terminals of the shunt. Start the inverter
as specified in 3.3.1.2.2.3. The conditions of 3.3.1.1.3 shall be met,
as determined by the oscilloscope reading.
4.4.5.2 Phase sequence. With the inverter operating under the load
conditions specified in 3.3.1.2.2.2, connect the phase sequence indi-
cator as specified in 4.4.3.6.1. Record the phase sequence as indicated
by the lamp which burns brightest. The phase sequence indicator shall
not be left in the circuit after phase sequence is determined or while
performing other measurements. The removal of the phase sequence cir-
cuit will prevent interference with the rated load to the inverter.
The indicated phase sequence shall be ABC.
4.4.5.3 Stop the inverter by shutting off its input power supply.
Replace any end bells or covers previously removed and remove the load
specified in 4.4.5.2.
4.4.5.4 Dielectric. Apply test voltages to the inverter terminals,
as specified in 3.3.1.6. Record any arcing or insulation breakdown
that occurs.
4.4.5.5 Vibration. The inverter shall be placed on a pad (4.4.3.13)
that is mounted on a hard flat surface. The inverter shall meet the
requirement of 3.3.1.1.1.
4.4.6 Certification. The manufacturer will certify that the require-
ments of 3.2.4.8 and 3.2.4.9 have been satisfied.
4.4.7 Visual inspection
4.4.7.1 The inverter shall conform to the requirements of 3.3.2.4,
3.3.2.5, and 3.3.2.7.
4.4.7.2 The inverter shall conform to the requirement of 3.3.2.6.
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