Chapter 4: AC Drive Parameters
4–70
Upper Bound for Integral Control Default Setting: 100
Range: 00 to 100%
• This parameter defines an upper boundary or limit for the integral gain (I) and
therefore limits the Master Frequency. Use the formula below to calculate the
Integral upper limit.
• The formula is: Integral upper limit = (Maximum Output Frequency) x P7.23. This
parameter can limit the Maximum Output Frequency.
Derivative Filter Time Constant Default Setting: 0.0
Range: 0.0 to 2.5 sec
To avoid amplification of measured noise in the controller output, a derivative
digital filter is inserted. This filter helps smooth oscillations. Larger values for
P7.24 provide more smoothing.
PID Output Frequency Limit Default Setting: 100
Range: 00 to 110%
This parameter defines the percentage of output frequency limit during the PID
control. The formula is Output Frequency Limit = (Maximum Output Frequency) x
P7.25. This parameter will limit the Maximum Output Frequency.
Feedback Signal Loss Detection Time Default Setting: 60
Range: 0.0 to 3600 sec
This parameter defines how long the PID Feedback signal is lost before an error is
generated. Setting this parameter to 0.0 disables the PID Feedback loss timer.
When the feedback signal is lost, the PID Feedback loss timer starts timing. When
the timer value is greater than the setting value of P7.26, the PID Feedback Loss
warning will activate as set in P7.27. The display shows "PID FBACK LOSS",
meaning a feedback abnormality is detected. When the signal is corrected, the
warning message "PID FBACK LOSS" will automatically be corrected if a PV signal
is still present. If no signal is present, then the screen must be manually reset.
P7.26
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