Midea V6 Series Service Manual page 101

V6 VRF 50Hz
2.15.6 L0: Inverter module protection
The DC bus wire connected incorrectly
The compressor wiring is connected
The resistance between 3 phases of
Disconnect
the power
supply
The inverter module is not well heat
Ensure enough The compressor has less than 12 hours
Yes
preheating time
Refer to "P3 over current protection"
Note:
2. The DC bus wire should run from the N_in 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_out terminal on the inverter module.
100
L0 protection
No
incorrectly
No
compressor is over 5Ω
No
The insulation resistance of
compressor is less than 100kΩ
No
dissipation
No
preheating before initial operating
No
Switch on power again to detect
whether the compressor can start
Yes
Figure 6-2.5: DC detection wire connection method
Yes Ensure the wire is
1
connected properly
Yes Reconnect the cables
based on wiring diagram
Yes
Replace the compressor
Yes
Yes
The IPM screws is loosen
No
The silica gel is coated not
well for heat radiation
No
No
Replace the inverter
module
Yes
Fasten IPM
screws again
Yes
Coat with silica
gel