YASKAWA T1000V Technical Manual page 124

5.2 b: Application
b5-01: PID Function Setting
■
Enables or disables the PID operation and selects the PID operation mode.
No.
b5-01
Setting 0: PID disabled
Setting 1: Output Frequency = PID Output 1
The PID controller is enabled and the PID output builds the frequency reference. The PID input is D controlled.
Setting 2: Output Frequency = PID Output 2
The PID controller is enabled and the PID output builds the frequency reference. The PID feedback is D controlled.
Setting 3: Output Frequency = Frequency Reference + PID Output 1
The PID controller is enabled and the PID output is added to the frequency reference. D control is applied to the
difference of the feedback value (U5-02) and the setpoint.
Setting 4: Output Frequency = Frequency Reference + PID Output 2
The PID controller is enabled and the PID output is added to the frequency reference. D control is applied to the feedback
value (U5-06).
■ b5-02: Proportional Gain Setting (P)
Sets the P gain that is applied to the PID input. A large value will tend to reduce the error, but may cause instability
(oscillations) if too high. A small value may allow too much offset between the setpoint and feedback.
No.
b5-02
b5-03: Integral Time Setting (I)
■
Sets the time constant that is used to calculate the integral of the PID input. The smaller the integral time set to b5-03, the
faster the offset will be eliminated. If set too short, it can cause overshoot or oscillations. To turn off the integral time, set
b5-03 = 0.00.
No.
b5-03
Figure 5.18
PID
feedback
b5-04: Integral Limit Setting
■
Sets the maximum output possible from the integral block. Set as a percentage of the maximum frequency (E1-04).
No.
b5-04
Note: In case of rapidly varying loads, the output of the PID function may show a fair amount of oscillation. To suppress this
oscillation, a limit can be applied to the integral output by programming b5-04.
124
Parameter Name
PID Function Setting
Name
Proportional Gain Setting (P)
Name
Integral Time Setting (I)
No Intregral
Setpoint
Offset
Feedback
Time
Figure 5.18 Offset Elimination by Integral Operation
Name
Integral Limit Setting
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Setting Range
0 to 4
Setting Range
0.00 to 25.00
Setting Range
0.0 to 360.0 s
With Intregral
Setpoint
Feedback
Time
Setting Range
0.0 to 100.0%
Default
0
Default
1.00
Default
1.0 s
Zero
offset with
integral action
Default
100.0%