Trane TVR Pro CO Series Service Manual page 31

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