Hitachi RAS-4-HNCE - RAS-(2-2.5)HVNP

8. Troubleshooting
276
SMGB0079 rev.0 - 01/2013
RAS-(3-12)H(V)N(P/C)(E)
Code Protection control Activating condition Remarks
P01
Pressure ratio control
Compression ratio ε ≥ 7.5 => frequency decrease
Compression ratio ε ≤ 1.6 => frequency increase
ε = (Pd+0.1)/(Ps+0.1)
P02
High-pressure increase protection
High Pressure Switch for Control is activated
=> Frequency Decrease
P03
Inverter current protection
If Inverter PCB secondary current
> (*1)A
=> frequency decrease
P04
Inverter n temperature increase
prevention
Inverter n temperature
RAS-3HVNPE / RAS-(4-6)HN(P/C)E ≥ 70 ºC
RAS-(4-6)HVNPE ≥ 80 ºC
RAS-(4-6)HVNCE ≥ 87 ºC
RAS-(8-12)HN(P/C)(E) ≥ 82 ºC
=> frequency decrease
P05
Discharge gas temperature increase
protection
Temperature at the top of compressor is high
=> frequency decrease
(Maximum temperature is different depending on
the frequency)
Temperature at the top of compressor > 107 ºC
=> Indicate P5
P09
High-pressure decrease protection
Discharge pressure of compressor decrease under
10MPa => Frequency increase
Cooling operation and lowest
step fan or heating operation
p0A
Demand current control (running
current limit control)
Compressor run current ≥ demand setting value
=> frequency decrease
Demand setting value: upper
limit of total running current is
set to 100%, 80%, 70%, 60%
at normal operation using
input on PCB1
Ps: Suction pressure of compressor (MPa)
Pd: Discharge pressure of compressor (MPa)
(1*)
Connection 380-415V 220-240V
HP 4 5 6 8 10 12 3 4 5 6
Current (A) 12.0 12.0 12.0 17.5 19.0 20.0 16.0 16.0 24.0 24.0
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.