n b5-47: PID Output Reverse Selection 2Determines whether a negative PID output reverses the direction of drive operation. When the PID function is used to trimthe frequency reference (b5-01 = 3 or 4), this parameter has no effect and the PID output will not be limited(same as b5-11 = 1).No. Name Setting Range Defaultb5-47 PID Output Reverse Selection 2 0, 1 1Setting 0: Reverse DisabledNegative PID output will be limited to 0 and the drive output will be stopped.Setting 1: Reverse EnabledNegative PID output will cause the drive to run in the opposite direction.n Fine-Tuning PIDFollow the directions below to fine tune PID control parameters:Table 5.12 PID Fine TuningGoal Tuning Procedure ResultSuppress overshoot • Reduce the derivative time (b5-05)• Increase the integral time (b5-03)Response Before adjustmentAfter adjustmentTimeAchieve stability quickly whileallowing some overshoot• Decrease the integral time (b5-03)• Increase the derivative time (b5-05)ResponseBefore adjustmentAfter adjustmentTimeSuppress long cycle oscillations(longer than the integral time setting) Increase the integral time (b5-03)ResponseBefore adjustmentAfter adjustmentTimeSuppress short cycle oscillations• If oscillation cycle time is close to thederivative time, reduce the derivativetime (b5-05).• If the derivative time is set to 0.00 s andoscillations are still a problem, reducethe proportional gain (b5-02) or increasethe PID primary delay time (b5-08)Response Before adjustmentAfter adjustmentTimeu b6: Dwell FunctionThe Dwell function temporarily holds the frequency reference at a predefined value for a set time then continues acceleratingor decelerating.The Dwell function helps prevent speed loss when starting and stopping a heavy load with induction motors.5.2 b: Application174 YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
