Mitsubishi Electric MELSEC iQ-R Series User Manual page 150

Error code Error name
1ACH CH Auto tuning
error
1AD0H Multiple module
interaction function
system error 1
1AD1H Multiple module
interaction function
system error 2
1AD2H Multiple module
interaction function
system error 3
3 TROUBLESHOOTING
148
3.4 List of Error Codes
Description and cause
The PID constants calculation value is out of the
allowable range.
At the initialization of the inter-module link function, an
abnormal response has been detected in the data
communication between the master temperature control
module and the CPU module.
At the initialization of the inter-module link function, a
system bus error has been detected.
At the initialization of the inter-module link function, an
abnormal response has been detected in the data
communication between the master temperature control
module and the other temperature control modules.
Corrective action
After turning ON and OFF 'Error reset command' (Y2),
take the following actions depending on the situation:
■Proportional band < 1
Error cause: The amplitude of the control response during
AT is small.
• Check the upper limit output limiter value. If the value is
smaller than 100%, change the value.
• Check the lower limit output limiter value. If the value is
greater than 0%, change the value.
• Change the input range to narrow the measured
temperature range.
■Proportional band  Full scale of the input range (in the
R mode), Proportional band  10001 (when the Q
compatible mode function is used)
Error cause: The amplitude of the control response during
AT is large.
• Change the upper limit output limiter value and the
lower limit output limiter value to reduce the amplitude
of the control response during AT.
■Integral time < 1
Error cause: The vibration cycle of the control response
during AT is short.
• Set the upper limit output limiter larger and the lower
limit output limiter smaller.
• Check the setting of Auto tuning mode selection. When
the high response mode has been set, change the
mode to standard mode.
■Integral time  3601
Error cause: The vibration cycle of the control response
during AT is long.
• Check the primary delay digital filter value and change
it if necessary.
• Check the value for number of moving average and
change it if necessary.
[When the temperature process value (PV) does not
decrease after exceeding the set value (SV)]
• 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.
[When the temperature process value (PV) does not
increase after exceeding the set value (SV)]
• Check the upper limit output limiter value. If the value is
smaller than 100%, change the value.
■Derivative time  3601
Error cause: The vibration cycle of the control response
during AT is long.
• Set the integral time to 3600 or a smaller value.
• Take measures to reduce noise.
• Check that each module has been properly connected,
and turn ON the power supply again or reset the CPU
module. When the same error occurs again, the
possible cause is a module failure. Please contact your
local Mitsubishi Electric sales office or representative.
• Take measures to reduce noise.
• Check that the base unit and extension cables have
been properly connected, and turn ON the power
supply again or reset the CPU module. When the same
error occurs again, the possible cause is a module
failure .Please contact your local Mitsubishi Electric
sales office or representative.
• Take measures to reduce noise.
• Check that each module has been properly connected,
and turn ON the power supply again or reset the CPU
module. When the same error occurs again, the
possible cause is a module failure. Please contact your
local Mitsubishi Electric sales office or representative.