HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
3.3 Troubleshooting HRS Series
AL21: DC line fuse cut
<Detection method> This alarm goes off when the fuse in the DC circuit of the contact I/O communication
connector blows.
DC line fuse cutAL21
Replace the fuse with a new
fuse.
See section "4.5.20
Replacement of fuse".
[Remarks]
- It is necessary to replace the fuse to reset the alarm.
- When AL21 is generated the Thermo-Chiller is stop as default setting. Although DC circuit
cannot be used (the alarm cannot be reset), it is possible to continue the Thermo-Chiller
operation even when the AL21 is being generated by changing setting of the "AS.15" in the
Alarm Setting Menu. (Refer to the section “Alarm Customizing Function” in Operation Manual for
details.)
AL22: Circulating fluid discharge temp. sensor failure
<Detection method> This alarm goes off when the circulating fluid temperature sensor (for discharge)
detects temperature that is outside of -80 to 120
o
C range.
N
Y
2.
Does "AL23" go
off when the cables that
are connected to PT1 and PT2
are exchanged and
connected?
Circulating fluid discharge
temp. sensor failure
AL22
1.
Check the connection.
Check for the correct
connections.
Error
Normal
Replace the main board.
See section "4.5.16
Replacement of main board
& communication board".
Replace the circulating fluid
temperature sensor (for
discharge) "PT1".
See section "4.5.1
Replacement of the
temperature sensor (PT1)".
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