Midea MV6-i450WV2GN1-E - Compressor and Inverter Module Protection Control; Disable Heating Control

V6-i VRF 50/60Hz
44
Midea V6-i Series Service Manual
6.4 Compressor and Inverter Module Protection Control
This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally
high temperatures. It is performed for each compressor and inverter module.
Figure 3-6.4: Compressor current protection control
Compressor model
AA55PHDG –D1YG
DC80PHDG –D1YG
Current
max
24.6
33
Figure 3-6.5: Inverter module temperature protection control
Notes:
1. T
f
: Heat sink temperature
6.5 Disable Heating Control
When the outdoor ambient temperature rises above 25°C heating mode is disabled to prevent the mechanical load on
compressors becoming too high and to prevent low compression ratios which can result in insufficient compressor internal
oil lubrication.
Figure 3-6.6: Disable heating control
When PL protection occurs 3 times
in 100 minutes, the C7 error is
displayed. When a C7 error occurs, a
manual system restart is required
before the system can resume
operation.
Current ≥ Current
max
Current < Current
max
Normal operation
Compressor current protection, error code xP3 is displayed
T
f
> 75
o
C
T
f
< 73
o
C
Normal operation
Compressor output reduced
T
f
> 80
o
C
T
f
< 65
o
C
Inverter module temperature protection,
error code PL is displayed
Outdoor ambient temperature > 25
o
C
Outdoor ambient temperature < 23
o
C
Heating operation
Units stop