Azbil C1M - Page 276

11-2
Chapter 11. Maintenance and Troubleshooting
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Alarm codes and countermeasures
This section describes the alarm codes that are displayed if this device has errors,
and also describes countermeasures. If any of the following abnormalities occur in
the instrument, the control function of this device will stop.
Alarm
code*
1
Description Cause Corrective action
Input error
AL01
PV input error (over
range)
Sensor burnout, incorrect wiring Check the wiring.
Incorrect settings for PV range
type, etc.
Check the PV range type (C01) and other
settings.
AL02
PV input error (under
range)
Sensor burnout, incorrect wiring Check the wiring.
Incorrect settings for PV range
type, etc.
Check the PV range type (C01) and other
settings.
AL03
Reference junction
compensation (cold
junction compensation)
error
Measurement range error in
terminal temperature at reference
junction compensation
Make sure that the ambient temperature is
within the specifications of this product.
RTD input error Sensor burnout, incorrect wiring Check the wiring.
AL11
CT input error (over
range)*
2
Current input exceeding the high
limit of the display range
Use a current transformer with a number
of turns that matches the display range.
Check the number of CT turns and the
setting.
Check the setting and the number of times
the power wire passes through the CT.
Incorrect wiring Check the wiring.
Instrument errors
AL70
A/D conversion error A/D conversion unit failure Turn the power off and then on again.
If the alarm is triggered when the power is
turned on again, replace the device.
AL74
Nonvolatile memory
error
Temporary communication error,
corruption of data written, or
failure of this device
AL80
Nonvolatile memory not
initialized
AL81
Setting value area error*
3
AL82
Adjustment value area
error*
3
AL83
Internal system error
AL84
Setting value
initialization error
Turn the power off and then on again.
If the alarm is triggered after turning
the power on again, the problem can be
corrected with the following procedure:
• Initialize the set point
• Write the setting again
If this procedure does not correct the
problem, replace the device.
AL95
Setting value error
AL96
Adjustment value error Turn the power off and then on again.
If the alarm is triggered after turning
the power on again, the problem can be
corrected with the following procedure:
• Restore the adjusted value*
4
If this procedure does not correct the
problem, replace the device.