YASKAWA iQpump Series Programming Manual page 28

b5-17 PI Accel/Decel Time
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Setting Range: 0.0 to 25.5 sec
Factory Default: 0.0 sec
This is a soft start function that is applied to the PI setpoint analog input. Instead of having nearly instantaneous changes in signal levels,
there is a programmed ramp applied to level changes. When changing setpoints the error can be limited by gradually ramping the setpoint
through the use of parameter b5-17.
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YASKAWA TM.iQp.02 iQpump Drive Programming Manual