30
5.4 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 3-5.4: Compressor current protection control
Current ≥ Current
max
Current < Current
max
Compressor model LNB53 LNB65
Current
max
45 51
Figure 3-5.5: Inverter module temperature protection
control
T
f
> 74
o
C T
f
< 71
o
C
T
f
<65
o
C
T
f
> 79
o
C
Notes:
1. T
f
: Heat sink temperature
Normal operation
Compressor current protection, error code xH4(xL0) is
Compressor output reduced
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.
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