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Test Methods
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Starter-Generator Engine STU-6A
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Dielectric strength



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MIL-S-26547C
TABLE V.
Operating Conditions
Cooling Air
Pressure Drop
Drive
Load
Operating
Across Generator
Terminal
Speed
Altitude
Current
(feet)
Time
(inces of water)
Voltage
(amp)
(rpm)
12
150
26
Sea level
Continuous
3,800
12
200
Sea level
Continuous
4,400
30
12
Sea level
200
Continuous
8,000
30
12
200
Sea level
Continuous
8,100
30
Sea level
5 minutes
10,100
Continuous
*6
60,000
165
8,000
30
* Cooling air temperature
to
for high altitude tests.
4.6.4.1  Heating.  The ability of the starter-generator to deliver
200 amp at 26V and 4400 rpm shall-be determined.
4.6.4.2  Commutation.  Immediately following the heat run with the
starter-generator hot, the commutation of the starter-generator shall be
observed over the speed range for no-load, half-load, and rated-load.  There
shall be no more than fine, pin-point sparking of the brushes during this test.
4.6.4.3 Minimum speed.  At no time during the heat run at minimum speed
of 3,800 rpm shall the required resistance external to the shunt field be less
than 1.25 ohms.
4.6.5 Overspeed.  This test shall be made while the starter-generator is
hot as a result of testing, and shall be made at no-load with the shunt field
circuit open and at an overspeed of 10,000 rpm.  The starter-generator shall
demonstrate ability to operate under overspeed conditions for 5 minutes without
mechanical failure, throwing of solder or varnish, or impairing of electrical
performance.
(See 3.7.5)
4.6.6  No-lead speed.  At zero torque, the starter no-load speed shall be
(See 3.7.6)
not less than 2,500 rpm with 23V dc applied at the terminals.
4.6.7  Radial Vibration.  After completion of the preceding tests, the
radial vibration shall not exceed 0.001 inch total deflection at maximum rated
It shall be per-
speed when the starter-generator is operated as a starter.
missible to employ a drive shaft support during the test.
(See 3.7.7)
4.6.8  Paralleling voltage drop.  The generator shall be tested for and
shall meet the paralleling voltage drop requirements of 3.7.8.
15

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