Mitsubishi Electric MELSEC iQ-R Series User Manual page 149

Error code Error name
1AH CH Sensor
twopoint correction
setting error
1A7H CH Auto tuning
error
1A8H CH Auto tuning
error
1A9H CH Auto tuning
error
1AAH CH Auto tuning
error
1ABH CH Auto tuning
error
Description and cause
The set values do not satisfy the following conditions:
• Sensor two-point correction offset value (measured
value) < Sensor two-point correction gain value
(measured value)
• Sensor two-point correction offset value (corrected
value) < Sensor two-point correction gain value
(corrected value)
 indicates the magnitude relation between the set
values as follows:
2: Sensor two-point correction offset value (measured
value)  Sensor two-point correction gain value
(measured value)
3: Sensor two-point correction offset value (corrected
value)  Sensor two-point correction gain value
(corrected value)
The temperature process value (PV) is out of the input
range.
The set value (SV) or the AT point is out of the upper/
lower limit setting limiter range.
The proportional band has been set to 0.
Settings of the buffer memory areas where changing the
settings is not allowed have been changed.
The auto tuning error judgment time has been
*2
exceeded.
Corrective action
Set the values that meet the following conditions:
• Sensor two-point correction offset value (measured
value) < Sensor two-point correction gain value
(measured value)
• Sensor two-point correction offset value (corrected
value) < Sensor two-point correction gain value
(corrected value)
After turning ON and OFF 'Error reset command' (Y2),
execute the auto tuning again considering the following
points:
• Set the AT bias so that the temperature process value
(PV) during AT does not get out of the input range.
• Check the upper limit output limiter value. If the value is
100% or greater, change the value.
• For controlled objects with a high-speed response, the
temperature process value (PV) may get out of the
input range when the standard mode has been set in
Auto tuning mode selection. In this case, set the high
response mode in Auto tuning mode selection.
After turning ON and OFF 'Error reset command' (Y2), set
a set value (SV), an AT point, or an upper/lower limit
setting limiter so that the set value (SV) or the AT point is
within the upper/lower limit setting limiter range, and
execute the auto tuning again.
After turning ON and OFF 'Error reset command' (Y2), set
the proportional band to a value other than 0, and execute
the auto tuning again.
After turning ON and OFF 'Error reset command' (Y2),
execute the auto tuning again. While the auto tuning is
being executed, do not change the settings of the buffer
memory areas.
After turning ON and OFF 'Error reset command' (Y2), set
the auto tuning error judgment time longer, and execute
the auto tuning again.
■When the temperature process value (PV) does not
reach the set value (SV) while the control output is ON
• Check the heater has been powered ON.
• Check the upper limit output limiter value. If the value is
smaller than 100%, change the value.
■When the temperature process value (PV) does not
reach the set value (SV) while the control output is OFF
• Check the lower limit output limiter value. If the value is
greater than 0%, change the value.
• The temperatures of the controlled objects may not fall
due to effects of the environment. Stop the control of
the adjacent controlled objects, and execute the auto
tuning on each controlled object.
Even though the error still cannot be solved after the
above actions are taken, manually set the PID constants.
Or, change the heater capacity.
3 TROUBLESHOOTING
3.4 List of Error Codes
3
147