Midea V4+R Series, Service Manual

Page: 35 / 104

V4+R VRF 50/60Hz
201702 33
P
art
3
- Con
tr
ol
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
Table 3-6.1: Current limitation for compressors
Compressor model E655DHD-65 E405DHD-36
Current
max
21A 12A
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
Current > Current
max
Current < Current
max
Normal operation
Compressor current protection, error code xP3 is displayed
72
o
C
＜
T
f
≤
76
o
C
T
f
≤
72
o
C
Normal operation
Exit silent/ super silent mode
T
f
> 76
o
C
T
f
< 55
o
C
Inverter module temperature protection,
error code PL is displayed
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.
Outdoor ambient temperature > 25
o
C Outdoor ambient temperature < 23
o
C
Heating operation
Units stop