Hitachi RAS-8.0HNBRMQ1 - Checking of Protection Control Information

72
1.6 Checking of Protection Control Information
Protection control code is displayed on 7-segment display when a protection control is activated. It is turned
OFF when the protection control is canceled. If several protection controls are activated, the code of the protection
control with highest priority will be displayed. Also if several retry control is activated, the code of the latest retry
control will be displayed.
Rank Order. Indication Protection Control Contents
1 P1 Pressure Ratio Protection Control
2 P2 High Pressure Increase Protection Control
3 P3 Inverter Current Protection Control
4 P4 Inverter Fin Temperature Increase Protection Control
5 P5 Discharge Temperature Increase Protection Control
6 P6 Low Pressure Decrease Protection Control
7 PA Demand Current Control
8 Pd Low Pressure Increase Protection Control
9 P9 High Pressure Decrease Protection Control
②
Lower Rank Order of Protection Control Function
Forced
Decrease
Forced Increase
Prohibition of
Increase
Prohibition of
Decrease
①
Higher Rank
Order of
Protection
Control Function
Forced Decrease
① ① ① ①
Forced Increase
① ① ① ①
Prohibited Increase
② ①
②
*1
①
Prohibited Decrease
② ② ② ②
*1: Discharge Temperature Increase Protection Control (P5) is higher than the following protection controls.
a) Low Pressure Decrease Protection Control (P6)
b) Demand Current Control (PA)
TROUBLESHOOTING