Mitsubishi Electric FR-F800 Instruction Manual page 383

(A) Application parameters
• PID action
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.
• 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 setting
Reverse action
Forward action
382
PARAMETERS
[Heating]
+ X>0
Set
X<0
point
-
Feedback signal
(measured value)
[Cooling]
X>0
+
Set
X<0
point
-
Feedback signal
(measured value)
Deviation
Plus Minus
Cold Increase
Hot Decrease
Too cold Decrease
Hot Increase
Deviation
Set point
Measured value
P action
I action
D action
PID action
Deviation
Set point
Measured value
Measured value
Set point
Deviation
Time
Time
Time
Time