Midea MV5-X252W/V2GN1 - 6 Protection Control

V5 X VRF 50/60Hz
30 201608
Midea V5 X Series Service Manual
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.
Figure 3-6.1: High pressure protection control
Notes:
1. P
c
: Discharge 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
Notes:
1. P
e
: Suction pressure
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.
Figure 3-6.3: Discharge temperature protection control
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
P
c
> 4.4MPa
P
c
< 3.2MPa
Normal operation
High pressure protection, error code P1 is displayed
P
e
< 0.05MPa
P
e
> 0.15MPa
Normal operation
Low pressure protection, error code P2 is displayed
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.
120
o
C
100
o
C
90
o
C
Discharge temperature
Compressor off
SV2 off
SV2 on
90
o
C