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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 for 30kW and 60kW units
Normal operation
Current > 24A
Current < 24A
Compressor current protection, error code P4 or P5 is displayed
When P4 or P5 protection occurs 3 times
in 60 minutes, a manual system restart is
required before the system can resume
operation.
Notes:
1. P4 is the protection for the power supply phase B, P5 is the protection for the power supply phase C.
When the compressor current rises above 24A, the system displays P4 or P5 protection and all the units stop running.
When the compressor current drops below 24A, the compressor enters re-start control.
Figure 3-6.5: Inverter module temperature protection control for 30kW and 60kW units
Normal operation
Tf1 or Tf2 > 82°C
Tf1 and Tf2 < 60°C
Inverter module temperature protection, error code PL is displayed
C7 is displayed when PL error occurs
3 times in 100 minutes, a manual
system restart is required before the
system can resume operation.
Notes:
1. Tf1:Heat sink temperature 1; Tf2:Heat sink temperature 2
When the Tf1 or Tf2 temperature rises above 82°C, the system displays PL protection and all the units stop running. When
the Tf1 and Tf2 temperature drops below 60°C, the compressor enters re-start control.
6.5 Voltage Protection Control
This control protects the units from abnormally high or abnormally low voltages.
Figure 3-6.6: Compressor voltage protection control
Normal operation
Voltage ≥ 260V
or Voltage < 165V
180V ≤ Voltage < 250V
Compressor voltage protection, error code H1 is displayed
When the phase voltage of AC power supply is at or above 260V for more than 30 seconds, the system displays H5
protection and all the units stop running. When the phase voltage drops below 250V for more than 30 seconds, the units
restart once the compressor re-start delay has elapsed. When the phase voltage is below 165V for more than 30 seconds,
the system displays H5 protection and all the units stop running. When the AC voltage rises to at or above 180V for more
than 30 seconds, the refrigerant system restarts once the compressor re-start delay has elapsed.
