(4) Activation condition of the protection retry control code
The protection
control or the retry control is carried out to prevent abnormal operation. The activation conditions are listed
in the following table.
Code Protection control Activation conditions Notes
P01 Pressure ratio protection control
Compression ratio Ɛ ≥ 8.5 or compression ratio Ɛ ≤ 2.0
-
P02
High pressure increase
protection
Discharge pressure
Pd ≥ 3.45 (in cooling mode)
Pd ≥ 3.35 (in heating mode and in heat recovery mode)
-
P03 Inverter current protection
Inverter output current ≥ (a) A
(a) 400 V = 22.5
-
P04
Inverter fin temperature
increase protection
Inverter fin temperature ≥ 80 °C
-
P05
Discharge gas temperature
increase protection
Temperature of the upper part of the compressor
Td ≥ 112 °C
-
P06
Low pressure decrease
protection
Suction pressure Ps ≤ 0.1 MPa
-
P09
High pressure decrease
protection
Discharge pressure Pd ≤ 1.0 MPa
-
P0A
Demand current protection
control
Compressor running current ≥ Demand current setting
value
Demand current setting value: the Upper
limit of the total running current is set to
100%, 80%, 70%, 60% and 40% in normal
operation.
P0d
Low pressure increase
protection
Suction pressure ≥ 1.3 MPa
-
8 Troubleshooting
247
SMGB0065 rev. 1 - 12/2010
8
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