YASKAWA E7U, Programming Manual

Page: 27 / 176

Programming 21
b5-17 PI Accel/Decel Time
Setting Range: 0.0 to 25.5 Seconds
Factory Default: 0.0 Seconds
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.
b5-18 PI Setpoint Selection
In order to use parameter b5-19 as the PI Setpoint, set parameter b5-18= “1: Enabled”. If b5-18= “0: Disabled” the PI Setpoint
will either be:
• Modbus Register 06H (If Register 0FH bit 1 is high)
• The active speed command (i.e. Determined by the setting of b1-01). See Table 1 “Setpoint Options”
b5-19 PI Setpoint Value
Setting Range: 0.00 to 100.00%
Factory Default: 0.00%
Parameter b5-19 is for a PI Setpoint value. When b5-18= “1: Enabled”, the value of b5-19 will take precedent over any other
PI setpoint unless the Drive is set up for Differential Feedback, in which case, b5-18 and b5-19 have no affect on the PI
function.
b5-20 PI Setpoint Display Scaling
The PI Setpoint Display Scaling value (b5-20) is a scaling factor that is applied to the monitor display for both the PI Setpoint
(U1-38) and the PI Feedback (U1-24).
Setting Description
0 Disabled ( factory default )
1 Enabled
Setting Description
0 Hz ( factory default )
1 %
3 RPM (Synchronous)
3 Engineering Units
Table 2 PI Setpoint Display Scaling Options
If b5-20 is:
U1-24 and U1-38
Display Increments.
0 0.01 Hz
1 0.00%
2 through 39
(enter the # of motor poles)
0 RPM
40 through 39999 Engineering Units