Part 4 | Trouble Shooting |
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3) Troubleshooting CH21 |
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Error | Title | Cause of error | Check point & Normal condition | |
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| • An instant over current in the U,V,W phase | |
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| • Instant over current | - Comp lock | |
21 |
| - The abnormal connection of U,V,W | ||
DC Peak | • Over Rated current | • Over load condition | ||
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| • Poor insulation of IPM | - Overcharging of refrigerant | |
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| - Pipe length. | |
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| • Poor insulation of compressor | |
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| Comp |
| U |
| Ω |
V | W |
Copper
Comp pipe
Ω |
Resistance(Ω) at 20°C(68°F)
Terminal | Inverter | Constant | |
comp. | comp. | ||
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0.64 | 0.8 | ||
0.64 | 0.8 | ||
0.64 | 0.8 | ||
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Resistance(Ω) at 20°C(68°F) | |||
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Terminal | Inverter | Constant | |
comp. | comp. | ||
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2MΩ | 2MΩ | ||
2MΩ | 2MΩ | ||
2MΩ | 2MΩ |
Check Point
1.Check the wire connection. (U,V,W)
2.Check the load condition. (Refrigerant, Pipe length, …) → Adjust the load condition
3.Check the electricity leakage of the compressor. → Normal : Over 2MΩ.
4.Check the resistance of compressor. → Normal : 0.65Ω(INV), 0.8Ω(Cons.) → No difference at each terminal.
5.Check the insulation from water at IPM part. → Check the trace of water.
6.Check the IPM circuit.
58Room Air Conditioner