M‐Thermal Split
201909 73
Figure 4‐4.1: Replacing an inverter module
Paint a layer of thermally conductive
silica gel on the PFC module
Paint a layer of thermally conductive
silica gel on the IPM module
Situation 2: L0 or L4 error appears immediately after the compressor starts up
L0 / L4
U V W wire between inverter module and
compressor is not connected properly
1
Yes
Ensure U V W wire is connected properly
No
Inverter module is damaged
2
Yes
Replace the inverter module
3
No
Compressor has malfunctioned
4
Yes
Replace the compressor
No
Replace the outdoor unit main PCB
Notes:
1.
Connect the U V W wire from the inverter module to the correct compressor terminals, as indicated by the labels on the compressor.
2.
Measure the resistance between each of U, V and W and each of P and N on the inverter module. All the resistances should be infinite. If any of them are
not infinite, the inverter module is damaged and should be replaced. Refer to
Figure 4‐2.2 or 4‐2.4 in Part 4, 2.1 “Outdoor Unit PCBs”.
3.
When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module, IGBT, diode ,brigde rectifer (on the
reverse side of the inverter module PCB). Refer to Figure 4‐4.1.
4.
The normal resistances of the inverter compressor are 0.7‐1.5Ω 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.
Midea CAC Confidential
Содержание SMK-60/CGN8
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