2.2 b: Application
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TOEP C710687 03B FSDrive-MV1000 Parameter Guide
125
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b5-38, b5-39: PID Setpoint User Display, PID Setpoint Display Digits
When parameter b5-20 is set to 3, parameters b5-38 and b5-39 set a user-defined display for the PID Setpoint (b5-19) and
PID feedback monitors (U5-01, U5-04).
Parameter b5-38 determines the display value when the maximum frequency is output and parameter b5-39 determines
the number of digits. The setting value is equal to the number of decimal places.
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b5-40: Frequency Reference Monitor Content During PID
Sets the content of the frequency reference monitor display (U1-01) when PID control is active.
Setting 0: Frequency Reference after PID
Monitor U1-01 displays the frequency reference increased or reduced for the PID output.
Setting 1: Frequency Reference
Monitor U1-01 displays the frequency reference value.
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Fine-Tuning PID
Follow the directions below to fine tune PID control parameters.
Table 2.12 PID Fine Tuning
No.
Name
Setting Range
Default
b5-38
PID Setpoint User Display
1 to 60000
Determined by b5-20
b5-39
PID Setpoint Display Digits
0 to 3
Determined by b5-20
No.
Name
Setting Range
Default
b5-40
Frequency Reference Monitor Content during PID
0 or 1
0
Goal
Tuning Procedure
Result
Suppress overshoot
• Reduce the derivative time (b5-05)
• increase the integral time (b5-03)
Achieve stability while allowing
some overshoot
• Decrease the integral time (b5-03)
• Increase the derivative time (b5-05)
Suppress long cycle oscillations
(longer than the integral time
setting)
• Increase the integral time (b5-03)
Response
Before adjustment
After adjustment
Time
Response
Before adjustment
After adjustment
Time
Response
Before adjustment
After adjustment
Time
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