Azbil MIZCON Plus - Troubleshooting; Error Indication

21 AB-6650
Troubleshooting
For any problem that is not solved by the corresponding action in the following list, please consult our sale personnel.
Problem Action
Controller is not turned on. Is the power source (breaker) connected (turned on)?
Temperature control DO1 and DO2 are not
output.
• Is the controller tuned on?
• Is the interlock input (DI) contact open?
• Is the temperature differential (DIF1 / DIF2) correct?
Blow-down valve is not closed when the
conductivity reaches the setpoint (SP).
• Is the blow-down differential correct?
• Is the motorized valve operating normally?
PV (measured value) of conductivity is lower
than the standard value of makeup water.
• Cleanse and rinse the sampling probe of the 4-electrode sensor, referring to P. 20.
• In case that the problem is not solved by the action above, check the controller with
the resistor for field inspection (Part No. 83167745-001).
If the controller operates normally, replace the 4-electrode sensor.
Error Indication
Error indication Description
CHAL Conductivity high limit alarm Cooling water conductivity out of the high limit alarm setpoint (OHSP) is detected.
C-Er Conductivity error for sensor
damage/malfunction
detection
The cooling water conductivity out of the range is measured.
Note: When the conductivity drops below 10 mS/m for 200 mS/m range or 20 mS/m
for 400 mS/m range, C-Er is indicated.
t-Er Temperature error for
sensor damage/malfunction
detection
The cooling water temperature out of the range is measured.
Note: When the temperature rises above 65 °C or drops below -15 °C, t-Er is
indicated.
C-AL Conductivity unmeasurable Replace the 4-electrode sensor.