Checking Of Protection Control Information - Hitachi mini-HNRQ1 Series Service Manual

TROUBLESHOOTING

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.
1
2
3
4
5
6
7
8
9
①
Higher Rank
Order of
Protection
Control Function
*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)
Indication
P1
P2
P3
P4
P5
P6
PA
Pd
P9
Forced
Decrease
Forced Decrease
Forced Increase
Prohibited Increase
Prohibited Decrease
Protection Control Contents
Pressure Ratio Protection Control
High Pressure Increase Protection Control
Inverter Current Protection Control
Inverter Fin Temperature Increase Protection Control
Discharge Temperature Increase Protection Control
Low Pressure Decrease Protection Control
Demand Current Control
Low Pressure Increase Protection Control
High Pressure Decrease Protection Control
② Lower Rank Order of Protection Control Function
Forced Increase
① ①
① ①
② ①
② ②
72
Prohibition of Prohibition of
Increase Decrease
① ①
① ①
*1
②
①
② ②