Yaskawa F7 Drive Programming Manual - Manual (Page 29)

Programming 21
b5-06 PID Output Limit
Setting Range: 0.0 to 100.0%
Factory Default: 100.0%
Places a cap on the output of the PID function. Limiting the PID function may help to prevent large overshoots in the Drive’s
response to error (the difference between the setpoint and the feedback).
b5-07 PID Offset Adjustment
Setting Range: -100.0% to +100.0%
Factory Default: 0.0%
The PID Offset Adjustment parameter has two different uses. Parameter b5-07 serves different functions depending on
whether it is used on a standard PID loop or a Differential PID loop.
Parameter b5-07 causes an offset to be applied to the output of the PID function in a non-Differential PID loop. Every time the
PID output is updated, the offset (b5-07) is summed with the PID output. This can be used to artificially kick-start a slow
starting PID loop.
If the Drive is configured for Differential PID Regulation (H3-09= “16: PID Differential”), then this parameter is the targeted
setpoint for the maintained differential between the signal measured on analog input A1 and the signal measured on analog
input A2.
b5-08 PID Primary Delay Time Constant
Setting Range: 0.00 to 10.00 Seconds
Factory Default: 0.00 Seconds
Acts as a time based filter that lowers the responsiveness of the PID function, but also makes the function more stable when
the setpoint varies rapidly or when the feedback is noisy.
b5-09 PID Output Level Selection
Normally, the output of the PID function causes an increase in motor speed whenever the measured feedback is below the
setpoint. This is referred to as direct acting response. However, if b5-09= “1: Reverse Output”, the output of the PID function
causes the motor to slow down when the feedback is below the setpoint. This is referred to as reverse acting response.
b5-10 PID Output Gain Setting
Setting Range: 0.0 to 25.0
Factory Default: 1.0
Applies a multiplier to the output of the PID function. Using the gain can be helpful when the PID function is used to trim the
frequency reference. Increasing b5-10 causes the PID function to have a greater regulating affect on the frequency reference.
Setting Description
0 Normal Output (direct acting) (factory default)
1 Reverse Output (reverse acting)