Hitachi UTOPIA RAS-4HVRP2E - Protection Control; Protection Control Code on 7-Segment Display

5 Control System
Protection control
SMGB0136 rev.0 - 07/2021
87
5
5.3 Protection control
5.3.1 Protection control code on 7-segment display
1 Protection control code is displayed on 7-segment when a protection control is activated.
2 Protection control code is displayed while function is working, and goes out when released.
3 When several protection control are activated, code number with higher priority will be indicated (see below for the
priority order).
a. Higher priority is given to protection control related to frequency control than the other. Priority order:
 High-pressure increase protection
 Over current protection
 Cold draft protection
b. In relation to retry control, the latest retrial will b indicated unless a protection control related to frequency control
is indicated.
Priority Protection control Code
1 Pressure Ratio Control
p1
2 Pd Protection control
p2
3 Current Protection Control
p3
4 Control for prevention of the increase of Inverter n temperature
P4
5 Td increase protection control
p5
6 Demand Control
pA
7 Pd decrease prevention control
p9
8 Inverter Trip Retry
P7
9 Insufcient Voltage/Open Phase Detection Retry
P8
? NOTE
The protection control code being indicated on 7‑segment display is changed to an alarm code when the abnormal operation occurs. Also,
the same alarm code is indicated on the remote control switch.