Chapter 6 PA Process control PID
115
If the integral separation is set to be effective, when the multi-function digital X-
integration pause (function 22) is valid, the integral PID integration of the PID stops the
calculation, and at this time, the PID only proportional and differential action is effective.
When the integral separation selection is invalid, the integral separation is invalid
regardless of whether the multi-function digital X is valid or not.
Whether to stop integration after output to the limit: After the PID operation output reaches
the maximum or minimum value, you can choose whether to stop the integral action. If
you choose to stop the integration, then the PID integration stops counting, which may
help reduce the overshoot of the PID.
PA-26
PID feedback loss
detection value
0.0%
：
Do not judge feedback loss 0.1%
～
100.0
％
Default
：
0.0%
PA-27
PID feedback loss
detection time
0.0s
～
20.0s
Default
：
0.0s
This function code is used to judge whether the PID feedback is lost.
When the PID feedback amount is less than the feedback loss detection value PA-26
and the duration exceeds the PID feedback loss detection time PA-27, the inverter
alarms the fault Err31 and processes according to the selected fault processing mode.
PA-28
PID
shutdown
operation
0
：
No operation at stop 1: Operation at
stop
Default
：
0
It is used to select whether the PID continues to operate under the PID stop state. In
general applications, the PID should stop computing in the shutdown state.
PB Group Swing frequency, fixed length and counting
The swing frequency function is suitable for textile, chemical fiber and other industries, as well
as occasions requiring traverse and winding functions. The swing frequency function refers to
the inverter output frequency, which swings up and down with the set frequency as the center,
and the running frequency is in the time axis.
As shown in Figure 6-28, the swing amplitude is set by PB-00 and PB-01. When PB-01 is set
to 0, the swing is 0. At this time, the swing frequency does not work.
Output frequency Hz
running
Limit frequency on swing
frequency
Center frequency Fset
Limit frequency under swing
frequency
Time t
Swing frequency range
Aw=Fset*PB-01
+Aw
-Aw
Textile kick
frequency =Aw*PB-
02
Wobble cycle
Accelerate by
acceleration
time
Triangle
wave rise
time...
Decelerate by
deceleration time
Figure 6-28 Schematic diagram of swing frequency operation
