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V4+R VRF 50/60Hz

201608 87

Part 5 - Diagnosis and Troubleshooting

First troubleshooting step 4.19.5

To troubleshoot xH4 errors, first ensure that the DC bus wire is connected correctly. The DC bus wire should run from the N

terminal on the inverter module, through the current sensor (in the direction indicated by the arrow on the current

sensor), and end at the N terminal on the DC filter board.

Figure 5-4.5: DC detection wire connection method

xL0 troubleshooting 4.19.6

Step 1: Check compressor

 Check that compressor wiring is all connected properly.

 The normal resistances of the inverter compressor are 0.9-5Ω among U V W and infinite between each of U V W and

ground. If any of the resistances differ from these specifications, the compressor has malfunctioned.

Figure 5-4.6: Measuring resistances among compressor

terminals

Figure 5-4.7: Measuring resistances between compressor terminals

and ground

 If the resistances are normal, go to Step 2.

Step 2: Check inverter module

 The DC voltage between terminals P and N should be 1.41 times the local power supply voltage. The DC voltage

between terminals 1 and 2 should be 510-580V. If either voltage is not in the normal range, troubleshoot as for xL1 or

xL2 errors. Refer to Part 5, 4.19.7 “xL1/xL4 troubleshooting” or Part 5, 4.19.8 “xL2 troubleshooting”.

 Disconnect the terminals 3, 4, 5 from the inverter compressor. Measure the resistance among terminals 1, 2, 3, 4, 5.

All the resistances should be infinite. If any of them are not infinite, the inverter module is damaged and should be

replaced.

Midea V4+R Series User Manual

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