TROUBLE- SHOOTING
ELECTRICAL COMPONENT SPECIFICA- TIONS
Note: See engine owner’s manual for engine troubleshooting.
WARNING
Only a qualified electrical service person should service and repair generator. Use only factory approved replacement parts.
OBSERVED | POSSIBLE |
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PROBLEM |
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No voltage when | 1. | Defective capacitor |
| 1. | Replace capacitor | ||||||
starting generator | 2. | Winding short circuit | 2. | Check resistance of coils (see | |||||||
with no electrical | |||||||||||
| or loose connections |
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| Electrical Component Speci- | |||||||
load |
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| fications, below) |
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| 3. | Defective rotor diode | 3. | Replace both diodes on rotor | ||||||
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| 4. | Loss of residual |
| 4. | Apply | |||||
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| magnetism |
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| capacitor terminals for | |||||
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Voltage is less than | 1. | Engine speed too low | 1. | Set engine speed to 3720 | |||||||
normal voltage with |
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| RPM (62 Hz) with no load | |||||
no electrical load | 2. | Defective rotor diode | 2. | Replace both diodes on rotor | |||||||
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| 3. | Partial short circuit in | 3. | Check resistance of coils (see | ||||||
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| Electrical Component Speci- | ||||
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| fications, below) |
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| 4. | Defective capacitor |
| 4. | Replace capacitor | |||||
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Voltmeter reading | 1. | Engine speed too high | 1. | Set engine speed to 3720 | |||||||
more than 10% high |
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with no electrical |
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load |
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Voltmeter reading | 1. | Defective rotor diode | 1. | Replace both diodes on rotor | |||||||
correct with no | 2. | Electrical load too high | 2. | Do not overload generator | |||||||
electrical load, but | |||||||||||
3. | Engine not running |
| 3. | Contact an authorized | |||||||
more than 10% low |
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| engine service center | ||||||
when electrical load |
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is added |
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| Resistance in Ohms |
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| Stator |
| Stator | Rotor |
| Rotor | Capacitor, |
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| Main | Auxiliary | Primary | Secondary | MFD |
| Diodes (2) | ||||
Model | Winding * | Winding Δ | Winding † | Winding † | 450 Volt |
| 800 Volt | ||||
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MGH3000 | 1.6 |
| 5.9 | 6.9 |
| 1.33 | 16 |
| 6 Amp | ||
MGH4000A | 0.71 |
| 2.17 | 0.54 |
| 2.07 | 40 |
| 70 Amp | ||
MGH5000A | 0.54 |
| 1.38 | 0.61 |
| 2.29 | 50 |
| 70 Amp | ||
MGH6000 | 0.37 |
| 1.01 | 0.68 |
| 2.57 | 60 |
| 70 Amp | ||
MGH7000 | 0.28 |
| 0.78 | 0.77 |
| 2.9 |
| 70 |
| 70 Amp | |
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*Connect T2 (green) and T3 (black). Measure resistance between T1 (red) and T4 (yellow). Δ Resistance between brown and white leads.
† Remove diodes to check resistance. | 25 |
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