Protection Control - intensity VRF V5 Series Service Manual

V5 X VRF 460V 60Hz

6 Protection Control

6.1 High Pressure Protection Control
This control protects the system from abnormally high pressure and protects the compressors from transient spikes in
pressure.
6.2 Low Pressure Protection Control
This control protects the system from abnormally low pressure and protects the compressors from transient drops in
pressure.
Figure 3-6.2: Low pressure protection control
P < 0.05MPa
e
Low pressure protection, error code P2 is displayed
Notes:
P : Suction pressure
1.
e
6.3 Discharge Temperature Protection Control
This control protects the compressors from abnormally high temperatures and transient spikes in temperature. It is
performed for each compressor.
When the discharge temperature rises above 120°C the system displays P4 protection and all units stop running. When P4
protection occurs 3 times in 100 minutes, the H6 error is displayed. When an H6 error occurs, a manual system restart is
required before the system can resume operation.
6.4 Compressor and Inverter Module Protection Control
This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally
30
Figure 3-6.1: High pressure protection control
Normal operation
P > 4.4MPa
c
High pressure protection, error code P1 is displayed
Notes:
1. P : Discharge pressure
c
Normal operation
P > 0.15MPa
e
Figure 3-6.3: Discharge temperature protection control
Discharge temperature
Compressor off
120 o C
100 o C
SV2 off
90 o C
P < 3.2MPa
c
When P2 protection occurs 3 times
in 60 minutes, the H5 error is
displayed. When an H5 error occurs,
a manual system restart is required
before the system can resume
operation.
SV2 on
90 o C