Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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(A) Application parameters Parameters
5 - 548
●
Reverse action
When deviation X = (set point - measured value) is a plus value, the manipulated amount (output fre-
quency) 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)
I002690E
Fig. 5-265: Heating
I002691E
Fig. 5-266: Cooling
PID action setting
Deviation
Plus Minus
Reverse action
Forward action
Tab. 5-223: Relationships between deviation and manipulated variable
X>0
X<0
+
-
Increase
[Heating]
Cold
Hot
Decrease
Deviation
Set point
Measured value
Feedback signal
(measured value)
Set point
X>0
X<0
+
-
Measured value
[Cooling]
Set point
Deviation
Too cold
Hot
Decrease
Increase
Set point
Feedback signal
(measured value)