Deviation Inversion; Pid Deviation Output; Pid Scaling - Omron 3G3MX2 User Manual

"A" Group: Standard Functions
112
The diagram below shows PID setpoint changes and the related output fre-
quency behavior when a limit value in
%
Output limit
A078
PID Setpoint
Output freq.
A078
Output limit
Deviation (error) Inversion - In typical heating loops or ventilation loops, an
increase in energy into the process results in an increasing PV. In this case,
the Loop Error = (SP - PV). For cooling loops, an increase in energy into the
process results in a decreasing PV. In this case, the Loop Error = -(SP - PV).

Use to configure the error term.
=
A077 00
SP
Error
+
Σ
-
PV from process with
PV
positive correlation
PID deviation output - If PID deviation "
signal configured as
PID feedback comparison output - If PID feedback is below Feedback Low

Limit and the inverter is in RUN mode the output turns ON, it remains
active until feedback gets over the PID High Limit
Stop mode.
PID feedback
ON
FW input
ON
FBV output
PID scaling - When PID scale parameter (
scaled.
(monitored) = (variable) × (
 
 
 

SP
Freq.
PID
calculation

(OD) is activated.
ON

)
  
  
  
Section 3-5
exists.
Limit imposed
on output
Limit imposed
on output
=
A077 01
Error
-
PID
Σ
calculation
+
PV from process with
PV
negative correlation

" exceeds the value in

or inverter pass to
C052 PID FBV output high limit
C053 PID FBV output low limit
Time

) is set, following variables are
 
 
 
t
Freq.

, output


