Hitachi UTOPIA RAS-4HVRP2E Service Manual page 92

5 Control System
Protection control

P04: Inverter fin temperature increase protection control
The inverter fin temperature increase protection control is carried out to prevent the damage of the inverter caused by
the increase in inverter fin temperature.
T2
T4
T5
Tmax
E
Model
RAS-3HVRC2
RAS-(4-6)HV(R/N)(C/P)2E
RAS-(4-6)H(R/N)(C/P)2E
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(*))

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 ≤ 1.2
1.0
Pd ≤
Pd < 1.0 (1)
90 SMGB0136 rev.0 - 07/2021
T1
T3
T5
T1
89
75
89
90
95
(*) Specific temperature for RAS-3HVRC2
Pd ≥ 1.5
Pd ≥ 1.1
A Normal operation
Not allowing frequency increases (only frequency
B
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)
?
N O T E
Tfin: inverter fin temperature sensor detected value.
T2 T3 T4
91 94 95
81 83 84
90 91 92
A
Normal operation
Not allowing frequency increases (only frequency
B
decreases are allowed)
Forced decrease in frequency (0.125Hz/s for 3HP;
C
0.25 Hz/s for 4-6HP)
D Abnormal stoppage (cause of stoppage d1-15)
(1) For 5 seconds
(2)
For 10 minutes
?
N O T E
• Td: discharge gas temperature sensor detected value.
• Units in ºC
A
Normal operation
Not allowing frequency decreases (only frequency
B
increases are allowed)
Forced increase in frequency (0.125Hz/s for 3HP;
C
0.25 Hz/s for 4-6HP)
D Abnormal stoppage (cause of stoppage d1-26)
(1) For 1 hour
?
N O T E
Pd: Detected Value of High Pressure Sensor.
T5 Tmax
98 100
87 92
95 100