Delta VFD-EL-W Series User Manual

Chapter 4 Parameters｜VFD-EL-W
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source cannot be the same.
 Negative feedback: Error = Target value (set point) – Feedback. Use negative feedback when
the detection value increases if the output frequency increases.
 Positive feedback: Error = - Target value (set point) + Feedback. Use positive feedback when the
detection value decreases if the output frequency increases.

10.11
PID Target Value
Default: 0.00
Settings
0.00–400.00 Hz
 Sets the target value when Pr.10.00 (PID Set Point Selection) is set to 4.

10.02
Proportional Gain (P)
Default: 1.0
Settings
0.0–10.0
 Gain P responds to the degree of deviation, and the deviation is reduced proportionally by
setting this parameter.
 Increasing Gain P can speed up the system response and reduce the steady-state error. But if
you set the value too high, it may cause overshoot and system oscillation, and reduce the
system stability. Decrease the setting value may slow down the system response, but it can
increase the system stability.
 If you set the other two gains (I and D) to zero, proportional control is the only effective
parameter.

10.03
Integral Time (I)
Default: 1.00
Settings
0.00–100.0 sec.
 Use the integral controller to eliminate the deviation during stable system operation. The integral
control does not stop working until the deviation is zero. The integral is affected by the integral
time. The smaller the integral time, the stronger the integral action. It is helpful to reduce
overshoot and oscillation for a stable system. Accordingly, the speed to lower the steady-state
deviation decreases. The integral control is often used with the other two controls for the PI
controller or PID controller.
 Sets the integral time of the I controller. When the integral time is long, there is a small I
controller gain, with slower response and slow external control. When the integral time is short,
there is a large I controller gain, with faster response and rapid external control.
 When the integral time is too short, it may cause overshoot or oscillation for the output frequency
and system.
 Set Integral Time to 0.00 to disable the I controller.

10.04
Differential Time (D)
Default: 0.00
Settings
0.00–1.00 sec.
 Use the differential controller to show the system deviation change, as well as to preview the
change in the deviation. You can use the differential controller to eliminate the deviation in order

Delta VFD-EL-W Series Specifications

General

Brand	Delta
Model	VFD-EL-W Series
Category	DC Drives
Language	English