Hitachi RAS-2-HVNP Service Manual page 289

8. Troubleshooting
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Activating condition of protection control code
To monitor the conditions such as the temperature change and others, the control of the frequency and other controls are
performed by the protection control in order to prevent the abnormal operations. The activating conditions of protection
control are shown in the table below:
RAS-(2-2.5)HVNP / RAS-3HVNC
Code Protection Control
Low-Pressure Ratio Control at Cooling
P0
Operation
High-Pressure Ratio Control at Heating
P1
Operation
P2 High-Pressure Increase Protection
P3 Over Current Protection
Inverter Temperature Increase Protection
P4
Discharge Gas Temperature Increase
P5
Protection
Unbalance Power Source Detecting
P9
PA Current Demand Control
Pb Low-Pressure Decrease Protection
(1*)
Connection
HP 2
Current (A) 8.0
275
SMGB0079 rev.0 - 01/2013
If Compression Ratio ε exceeds a threshold value
=> Frequency Increase
If Compression Ratio ε is lower than a threshold value
=> Frequency Decrease
High Pressure Switch for Control is activated
=> Frequency Decrease
Inverter Output Current > (*1)A
=> Frequency Decrease
Inverter Fin Temperature
RAS-(2-2.5)HVNP / RAS-3HVNC ≥ 70 ºC
=> Frequency Decrease
Temperature at the top of compressor is high
=> Frequency Decrease
Inverter Output Current exceeds a threshold value
=> Frequency Decrease
Inverter Output Current exceeds a threshold value
=> Frequency Decrease
Low Pressure Switch for Control is activated.
=> Frequency Decrease
220-240V
2.5 3
8.0 10.5
Activating Condition Remarks
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In case of
Demand Control Setting
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