Mitsubishi FR-A800

(A) Application parameters
504
PARAMETERS
• PID action
• Reverse action
When deviation X = (set point - measured value) is a plus value, the manipulated amount (output frequency) is increased, and
when the deviation is a minus value, the manipulated amount is decreased.
• Forward action
When deviation X = (set point - measured value) is a minus value, the manipulated amount (output frequency) is increased,
and when the deviation is a plus value, the manipulated amount is decreased.
Relationship between deviation and manipulated amount (output frequency)
PID action is a combination of PI and PD action, which enables control that
incorporates the respective strengths of these actions.
(Note) PID action is the result of all P, I and D actions being added together.
PID action setting
Deviation
Plus Minus
Reverse action
Forward action
Deviation
Set point
Measured value
Time
Time
Time
PID action
D action
P action
I action
Time
Set
point
X>0
X<0
Feedback signal
(measured value)
+
-
[Heating]
Deviation
Set point
Measured value
Cold
Hot
Increase
Decrease
Set
point
X>0
X<0
Feedback signal
(measured value)
+
-
[Cooling]
Deviation
Set point
Measured value
Too cold
Hot
Decrease
Increase