18
VS-616PS5 Programming Manual
B5
PID Control
The Proportional, Integral, and Derivative (PID) control function provides closed-loop
control and regulation of a system variable such as temperature or pressure. A con-
trol signal based on the difference (or error) between a feedback signal and a desired
setpoint is produced. Integration and derivative calculations are then performed on
this signal, based upon the PID parameter settings (B5-01 to B5-08), to minimize
deviation, for precise control.
To enable PID control, set PID control mode selection to “1” or “2”, according to the
description below. Also be sure to set terminal 16 function selection
(H3-05)
to PID
feedback (Set Value: “B”).
Notes:
1.
PID with feed forward applies control much quicker than normal PID, without waiting for the
deviation signal to build up.
2.
A PID inverse feedback signal can be selected by inverting the settings for terminal 16 gain
and bias.
Then select the PID control intended value (setpoint) and detected value (feedback)
setpoint as follows:
Detected Value (Feedback)
Set the PID feedback value with the control circuit terminal 16 voltage signal (0 to
10V, -10 to 10V) or multi-step speed parameters
H1-03
to
H1-06
.
Control circuit terminal 16 voltage signal:
Set reference selection
(B1-01)
to “1” and set
H3-05 = “B”
.
Multi-step speed parameters via multifunction inputs (
H1-01
to
H1-06
):
Set reference selection
(B1-01)
to “0.”
Set multifunction inputs to (
H1-01
to
H1-06
) set value 3,4 and/or 5.
(allows combination of multi-step speed references and jog frequency reference
as entered in parameter
D1-01 thru D1-09
)
Intended Value (Setpoint)
The control circuit terminal 14 current signal (4 to 20mA) or voltage signals (0 to 10V,
-10 to +10V) can be used to set the PID setpoint value.
Control circuit terminal 14 accepts 4-20 MA current signal:
Set terminal 14 signal selection
(H3-08)
to “2.”
B5-01 PID Control Mode Selection
A
Setting
Description
0
PID is disabled
(factory default).
1
PID is enabled (deviation signal is put through derivative control).
2
PID operates with feed forward (feedback signal is put through derivative control).
Section B: Application Parameters
B5 PID Control
