Hitachi RCUE40AG2 Service Manual page 117

Troubleshooting

Alarm code

[Alarm Stop Reason]
-Operation current for any compressor
is increased too much and activates the
Thermal Relay.
-Chattering of external protection device
connected to the chiller (eg: fl ow switch)
Is alarm activated just after
running operation?
No (Activate
after a while)
Is 220-240V the voltage
between connector
PCN207 PIN1 and
connector PCN 207 PIN3
on the Printed Circuit
Board for Relay (PCB )?
D
Yes
Wiring check
pag. 115
SMGB0003 rev.0 - 01/2007
Activation of Thermal Relay for Compressor (51C)
[PCB Monitoring Position]
Yes
(activated
Is 220-240V the voltage
immediately)
between connectorPCN207
PIN1 and connector PCN 207
PIN3 on the Printed Circuit
Board for Relay (PCB
No (Printed circuit
board is normal)
No. 1 Cycle: PCB (I/O PCB) PCN207
D1
No. 2 Cycle: PCB (I/O PCB) PCN207
D2
No. 3 Cycle: PCB (I/O PCB) PCN207
D3
No. 4 Cycle: PCB (I/O PCB) PCN207
D4
No. 5 Cycle: PCB (I/O PCB) PCN207
D5
Yes
Check Printed Circuit
Board for input/output
(PWB
)?
D
No
Wiring Check
(breaking of wire,
wrong wiring)
Excessive or short power source voltage
Interphase of power source voltage is imbalanced.
Compressor motor is locked
Insulation of compressor motor is lowered
Power fuse for compressor motor is broken
Power source terminal screw loosened
Thermal relay for compressor failure
Compressor slide valve malfunction
Flow Switch is Chattering
Auxiliary Relay Arn malfunction
)
D
5 5