Hitachi RAS-2-HVNP Service Manual page 290

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