External Pid Control - Toshiba TOSVERT VF-AS3 Instruction Manual

9

External PID control

Two types of PID control blocks are provided for controlling the external equipment such as valve and damper. This
function can be enabled by setting the parameter or turning on/off the input terminal.
The following shows a block diagram of external PID control.
Use the parameters of external PID3 control and external PID4 control. The two types of PID control work independently.
Only the process PID control is supported. The unit used for a set value, feedback value and PID control output is %. (The
unit used for PID1/PID2 control is frequency.)
■ Diagram
• External PID3 control
PID set value
upper-limit
Set value
[A341]
PID set value
lower-limit
Feedback value
[A342]
• External PID4 control
PID set value
upper-limit
[A379]
Set value
[A371]
PID set value
lower-limit
[A380]
Feedback value
[A372]
• The output at the time of enabling the external PID control is 0.
• When the external PID control is turned off, the output becomes 0.
VF-AS3
PID deviation
upper-limit
[A349]
[A346]
-
PID deviation
lower-limit
[A350]
[A347]
PID plus/minus
PID deviation
upper-limit
[A376]
-
PID deviation
lower-limit
[A377]
PID plus/minus
PID output
upper-limit
[A352]
PID control
PID output
lower-limit
[A353]
[A340]
PID output
upper-limit
[A382]
PID control
PID output
lower-limit
[A383]
[A370]
9-1
PID
output
PID
output
9. External PID control
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