LS LSLV-iV5 Series, Руководство пользователя

Страница: 145 / 288

6. Function Description
6-61
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 ( 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.
If the proportional gain or integral gain of the Process PID controller is increases, the response of the controller
becomes faster, however, the system may become unstable. The proportional gain and integral gain values are small,
the system response time becomes longer.
Code LCD display Description Setting range Unit Factory setting
CON_14 Proc PID Kp Process PID P gain 0.0 ~ 999.9 % 0.0
CON_15 Proc PID Ki Process PID I gain 0.0 ~ 100.0 % 0.0
CON_16 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_17 Proc Pos Lmt Process PID positive limit -100 ~ 100 % 100
CON_18 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_19 Proc Out LPF
Process PID output
LPF time constant
0 ~ 500 ms 0
CON_20 Proc OutGain Process PID output gain -250.0 ~ 250.0 % 0.0
There is a parameter which determines the range to be used when 100% output of the Process PID is converted to
speed command. Setting up CON_21, the range of the speed command by Process PID is Base Speed(PAR_17), Ref
Speed(command speed), Speed Set(CON_22), respectively for each case.
Code LCD display Description Setting range Unit Factory setting
CON_21 Proc PID Src Process PID type
0 (Base Speed)
1 (Ref Speed)
2 (Speed Set)
0 (Base Speed)
CON_22 PID SpeedSet Speed Set setting 100 ~ FUN_04 rpm 100