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F-44 TROUBLESHOOTING & REPAIRF-44
ROTOR VOLTAGE TEST (continued)
FIGURE F.10 – LEAD LOCATIONS
SLIP RINGS
BRUSHES
LEADS 200A 200
+ | LEADS | - |
| 201 | |
| 5H |
|
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TEST PROCEDURE | |
1. | Perform the Case Cover Removal proce- |
2. | dure. |
Connect the voltmeter probes to the brush | |
| terminals. See Figure F.10. See the wiring |
3. | diagram. |
Set the RUN/STOP switch to “RUN” and | |
| the IDLE switch to “HIGH”. Start the engine |
| and allow the RPM to stabilize for about 15 |
| to 30 seconds. |
4. | The meter should read 46 to 54 VDC. |
Set the RUN/STOP switch to “STOP” | |
5. | If the meter reading is normal, this test is |
6. | complete. |
If the voltage measures zero or very near | |
| zero, the rotor flashing circuit may be faulty |
| or the rotor may be shorted. |
RANGER 305D
7.Perform the andRotortheResistance and
Ground Test. Rotor Flashing
8.IfVoltagevoltageTestis higher than 54 VDC, the engine RPM may be too high, or there may be voltage intrusion from one of the higher voltage stator windings to the stator exciter winding. Perform the
,and theEngineS Throttle
Adjustment Test . tator Short
9.IfCircuitthe voltageand Groundis lowerTestthan 46, but high- er than 14, the engine RPM may be too low, or there may be problems in the wind- ings or other exciter circuit components or connections. Perform the
,and thenE gineperformThrottlethe testingAdjustmentdescribedT stbelow, under the heading “If the voltage measures about 3 to 5 VDC”
