Delta VFD007B21A - PID Control; Input Terminal for PID Feedback; Gain over the PID Detection Value; Proportional Gain

Chapter 5 Parameters_VFD-B Series
5-106
Revision 10/2005, BE13, SW V4.08
Group 10: PID Control
10 - 00
Input Terminal for PID Feedback
Factory Setting: 00
Settings 00 Inhibit PID operation: external terminals AVI, ACI may be used for frequency
command if required (Pr.02-00).
01 Negative PID feedback from external terminal AVI (0 ~ +10VDC).
02 Negative PID feedback from external terminal ACI (4 ~ 20mA).
03 Positive PID feedback from external terminal AVI (0 ~ +10VDC).
04 Positive PID feedback from external terminal ACI (4 ~ 20mA).

Note that the measured variable (feedback) controls the output frequency (Hz). Select input terminal
accordingly. Make sure this parameter setting does not conflict with the setting for Pr.02-00 (Master
Frequency).

When Pr.02-00 is set to 01 or 02, the set point (Master Frequency) for PID control is obtained from the
AVI/ACI external terminal (0 to +10V or 4-20mA) or from multi-step speed. When Pr.02-00 is set to 00, the
set point is obtained from the keypad.

Negative feedback means: +target value – feedback
Positive feedback means: -target value + feedback.
10 - 01
Gain Over the PID Detection Value Unit: 0.01
Settings 0.00 to 10.00 Factory Setting: 1.00

This is the gain adjustment over the feedback detection value. Refer to PID control block diagram in Pr.10-
06 for detail.
10 - 02
aProportional Gain (P) Unit: 0.01
Settings 0.0 to 10.0 Factory Setting: 1.0

This parameter specifies proportional control and associated gain (P). If the other two gains (I and D) are
set to zero, proportional control is the only one effective. With 10% deviation (error) and P=1, the output will
be P x10% x Master Frequency.