Hitachi UTOPIA RAS-4HVRP2E - Page 91

5 Control System
Protection control
SMGB0136 rev.0 - 07/2021
89
5
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P02: High pressure protection control
The high pressure protection control is carried out to prevent the protection device from being activated due to an
increase in high pressure during an anomaly and protect the compressor from excessive high pressure increases.
D
Pd ≥ 3.50
Pd ≥ 3.55
Pd > 3.80 (1)
Pd ≤ 3.30
Pd ≤ 3.50
A Normal operation
B
Not allowing frequency increases (only frequency decreases
are allowed)
C Forced decrease in frequency (1.5 Hz/s)
D Abnormal stoppage (cause of stoppage d1-13)
(1) For 2 seconds
? NOTE
• Pd: high pressure sensor detected value.
• UnitsinMPa.
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P03: Inverter current protection control
The Inverter current protection control is carried out to prevent the damage of the inverter caused by the increase of
inverter secondary current value.
a. Inverter Secondary Current Protection
linv<I2
linv >I1
linv >I3
linv<I4
linv >I5(1)
A Normal operation
B
Not allowing frequency increases (only frequency decreases
are allowed)
C Forced decrease in frequency (2.0 Hz/s)
D Abnormal stoppage (cause of stoppage d1-17)
(1) For 30 seconds
? NOTE
Iinv:DetectedValueofInverterSecondaryCurrentSensor(A)
Model I1 I2 I3 I4 I5
RAS-3HVRC2 9 8 10.5 9.5 -
RAS-(4-6)HV(R/N)(C/P)2E 18.5 17.5 20.0 19 28
RAS-(4-6)H(R/N)(C/P)2E 19 18.5 20.0 19.5 28
Units in Amp.