Hitachi RAS-3HVRNS - Page 305

The activating conditions of protection control are shown in the table below
Code Protection Control Activating Condition Remarks
P0
Low-Pressure Ratio Control at Cooling
Operation
Compression Ratio ε < 2.2
=> Frequency Increase
ε = (Pd+0.1)/(Ps+0.1)
P1
High-Pressure Ratio Control at Heating
Operation
Compression Ratio ε > 7.5
=> Frequency Decrease
ε = (Pd+0.1)/(Ps+0.1)
P2
High-Pressure Increase Protection High Pressure Switch for Control is activated
=> Frequency Decrease
—
P3
Over Current Protection Inverter Output Current > (*1)A
=> Frequency Decrease
—
P4
DIP-IPM, ISPM or IPM Temperature
Increase Protection
Inverter Fin Temperature
RAS-8~10HRNSE > 100 ºC
RAS-3~6HVRNS(E) > 80 ºC
=> Frequency Decrease
—
P5
Discharge Gas Temperature Increase
Protection
Temperature at the top of compressor is high
=> Frequency Decrease
Temperature at the top of compressor > 107 ºC
=> Indicate P5
—
P6
Frost Formation Protection
TL ≤ 2 °C Over 3 minutes => Frequency Decrease
TL: Liquid Piping,
Temperature of Indoor Unit
P9
Unbalance Power Source Detecting Inverter Output Current > (*3)A
=> Frequency Decrease
—
P
Current Demand Control Inverter Output Current > (*2)A
=> Frequency Decrease
In case of
Demand Control Setting
Pb
Low-Pressure Decrease Protection Low Pressure Switch for Control is activated.
=> Frequency Decrease
—
PC
Cold Draft Protection
TO ≤ 10 ºC and ε ≥ 2.6 => Frequency Decrease
ε = (Pd+0.1)/(Ps+0.1)
TO: Outlet Temperature of
Indoor Unit
P7
Inverter Retry Automatic Stoppage of Transistor Module,
Activation of Electronic Thermal or Abnormal Current
Sensor
When activating 3 times in 30
minutes, “48”, “51”, “53” or “54”
alarm is indicated.
P8
Inverter Retry Insufficient/Excessive Voltage at Inverter
Circuit or PCB Connector Part
When activating 3 times in 30
minutes, “06” or “55” alarm is
indicated.
N O T E
• During protection control (except during alarm stoppage), the protection control code is indicated.
• The protection control code is indicated during protection control and turns off when cancelling the protection
control.
• After retry control, the condition of monitoring is continued for 30 minutes.
• The Maximum value of IVX series (*1) and (*2) are as follows:
• The Maximum value of ES series (*3), (*4) and (*5) are as follows:
(1*)
HP
380-415V 220-240V
4 5 6 8 10 12 3 4 5 6
Current (A) 8.0 12.0 12.0 17.5 20.0 21.0 16.0 16.0 24.0 24.0
(2*)
HP
380-415V 220-240V
Demand setting
4 5 6 8 10 12 3 4 5 6
Current (A)
100% 4.0 5.5 20.0 8.5 10.0 12.0 11.5 13.0 17.0 20.0
75% 3.0 4.0 15.0 6.0 8.0 12.0 8.5 10.0 13.0 15.0
50% 2.0 2.0 10.0 4.0 5.0 7.5 5.5 6.5 8.5 10.0
8 Troubleshooting
297
SMGB0060 rev. 1- 12/2010
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