6. Function Description
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The definition of P gain and I gain in the Process PID controller is as follows. If P gain is 100% and I gain is 0% and
the input error of the Process PID controller (CON_11 + Proc PID Ref - Proc PID F/B) is 100%, the output of Process PID
controller is 100%. If I gain is 10% and P gain is 0 and the input error is 100%, it takes the output of the Process PI
controller 1 second to be accumulated up to 100%. The higher I gain becomes, the faster the response becomes
reducing the accumulated time. Finally, the output of Process PID controller (%) multiplied by the maximum motor
speed (FUN_04) is added to the total speed command.
Code LCD display Description Setting range Unit Factory setting
CON_13 Proc PID Kp Process PID P gain 0.0 ~ 999.9 % 0.0
CON_14 Proc PID Ki Process PID I gain 0.0 ~ 100.0 % 0.0
CON_15 Proc PID Kd Process PID D gain 0.0 ~ 100.0 % 0.0
To prevent the Process PID controller from being saturated by the malfunction of the Process PID controller, the
output of the Process PID controller can be limited to the positive or negative value, separately from the main speed
controller.
Code LCD display Description Setting range Unit Factory setting
CON_16 Proc Pos Lmt Process PID positive limit -100 ~ 100 % 100
CON_17 Proc Neg Lmt Process PID negative limit -100 ~ 100 % 100
Low pass filter at the output of the Process PID controller can be used. In this case, filter output is multplied by the
output gain and fed to the speed command.
Code LCD display Description Setting range Unit Factory setting
CON_18 Proc Out LPF
Process PID output
LPF time constant
0 ~ 500 ms 0
CON_19 Proc OutGain Process PID output gain -250.0 ~ 250.0 % 0.0
If the output error of Process PID exists at stopping, it keeps current motor speed during “PID Hold Time” and then free-
runs and stops by stopping friction power. If output error is “0”, motor is stopped regardless of “PID Hold Time“ setting.
Code LCD display Description Setting range Unit Factory setting
CON_21 PIDHoldTime Process PID Hold Time 0 ~ 10000 ms 5000
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