Mitsubishi Electric 800 Series Instruction Manual page 402

• 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.
Set
point
Relationship between deviation and manipulated amount (output frequency)
PID action setting
Plus
Reverse action
Forward action
[Cooling]
X>0
+
Too cold
X<0 Hot
-
Feedback signal
(measured value)
Deviation
Minus
Measured value
Decrease
Increase
Deviation
Set point
5. PARAMETERS
5.11 (A) Application parameters
3
4
5
5
5
6
7
8
9
10
401