Yaskawa P7 Drive User Manual - Manual (Page 101)

Programming 5 - 17
b5-04 Integral Limit Setting
Setting Range: 0.0 to 100.0%
Factory Default: 100.0%
On some applications, especially those with rapidly varying loads, the output of the PI function may have large oscillations. To
suppress these oscillations, a limit can be applied to the integral factor by programming b5-04.
b5-06 PI Output Limit
Setting Range: 0.0 to 100.0%
Factory Default: 100.0%
Places a cap on the output of the PI function. Limiting the PI function may help to prevent large overshoots in the Drive’s
response to error (the difference between the setpoint and the feedback).
b5-07 PI Offset Adjustment
Setting Range: -100.0% to +100.0%
Factory Default: 0.0%
The PI Offset Adjustment parameter has two different uses. Parameter b5-07 serves different functions depending on whether it
is used on a standard PI loop or a Differential PI loop.
Parameter b5-07 causes an offset to be applied to the output of the PI function in a non-Differential PI loop. Every time the PI
output is updated, the offset (b5-07) is summed with the PI output. This can be used to artificially kick-start a slow starting PI
loop.
If the Drive is configured for Differential PI Regulation (H3-09= “16: PI differential”), then this parameter is the target
setpoint for the differential to be maintained between the signal measured on analog input A1 and the signal measured on
analog input A2.
b5-08 PI 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 PI function, but also makes the function more stable when the
setpoint varies rapidly or when the feedback is noisy.
b5-09 PI Output Level Selection
Normally, the output of the PI 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 PI function
causes the motor to slow down when the feedback is below the setpoint. This is referred to as reverse acting response.
Setting Description
0 Normal Output (direct acting) (factory default)
1 Reverse Output (reverse acting)