Hitachi UTOPIA RAS-4HVRP2E - Page 92

5 Control System
Protection control
SMGB0136 rev.0 - 07/2021
90

P04: Inverter n temperature increase protection control
The inverter n temperature increase protection control is carried out to prevent the damage of the inverter caused by
the increase in inverter n temperature.
T5
T3
T1
T2
T4
T5
Tmax
E
A Normal operation
B
Not allowing frequency increases (only frequency
decreases are allowed)
C Forced decrease in frequency (0.125 Hz/s)
D Forced decrease in frequency (0.5 Hz/s)
E Abnormal stoppage (cause of stoppage d1-17)
? NOTE
Tn:inverterntemperaturesensordetectedvalue.
Model T1 T2 T3 T4 T5 Tmax
RAS-3HVRC2 89 91 94 95 98 100
RAS-(4-6)HV(R/N)(C/P)2E 75 81 83 84 87 92
RAS-(4-6)H(R/N)(C/P)2E 89 90 91 92 95 100
Units in ºC

P05: Discharge temperature increase protection control
The discharge temperature increase protection control is carried out to protect the compressor motor coil from a
discharge pressure increase during an anomaly.
92
97
120 (125(*))
105 (115(*))
90
95
(*) Specic temperature for RAS-3HVRC2
A Normal operation
B
Not allowing frequency increases (only frequency
decreases are allowed)
C
Forced decrease in frequency (0.125Hz/s for 3HP;
0.25 Hz/s for 4-6HP)
D Abnormal stoppage (cause of stoppage d1-15)
(1) For 5 seconds
(2) For 10 minutes
? NOTE
• Td: discharge gas temperature sensor detected value.
• Units in ºC

P09: High pressure decrease protection control
The suction pressure protection control is carried out to protect the compressor from a transitory decrease in suction
pressure.
Pd
<
≤
Pd
Pd
Pd
Pd
≤
≥
≥
1.2
1.0
1.5
1.1
1.0 (1)
A Normal operation
B
Not allowing frequency decreases (only frequency
increases are allowed)
C
Forced increase in frequency (0.125Hz/s for 3HP;
0.25 Hz/s for 4-6HP)
D Abnormal stoppage (cause of stoppage d1-26)
(1) For 1 hour
? NOTE
Pd: Detected Value of High Pressure Sensor.