At Bias (Buffer Memory Address 53, 85: Un\G53, Un\G85); Forward/Reverse Action Setting (Buffer Memory Address 54, 86: Un\G54, Un\G86) - Mitsubishi Electric MELSEC-Q Series User Manual

3 SPECIFICATIONS

3.5.26 AT bias (buffer memory address 53, 85: Un\G53, Un\G85)

3.5.27 Forward/reverse action setting (buffer memory address 54, 86: Un\G54, Un\G86)

3 - 94
(1) The auto tuning decides each PID constant by executing the ON/OFF operation
of control output and hunching the measured value.
Set the AT bias, if the overshoot of this hunching is not suitable for the control
target.
(2) When the AT bias is set, the center point of auto tuning is shifted. (The shifted
point is called AT point.)
(3) Set the range which has minimal PID operation fluctuations and will not affect
the control results.
Otherwise, exact PID constants may not be provided depending on the control
target.
[Setting of AT bias on negative side (for reverse action)]
(4) The setting range is
(1) An action type (forward or reverse) is set for each channel.
• Forward action (cooling control): Set 0.
• Reverse action (heating control): Set 1.
full-scale.
MELSEC-Q
3 - 94