Mitsubishi Electric FR-D720S SC EC Instruction Manual page 396

Special operation
Reverse action
Increases the manipulated variable fi (output frequency) if deviation X = (set point − measured
value) is positive, and decreases the manipulated variable if deviation is negative.
Set point
Fig. 6-123: Heater
Forward action
Increases the manipulated variable (output frequency) if deviation X = (set point − measured val-
ue) is negative, and decreases the manipulated variable if deviation is positive.
Set point
Fig. 6-124: Cooling
Relationships between deviation and manipulated variable (output frequency).
Reverse action
Forward action
Tab. 6-87: Relationships between deviation and manipulated variable
6 - 246
X>0
+
Cold → fi increased
Hot → fi decreased
X<0
–
Feedback signal
(measured value)
X>0
+
Cold → fi decrease
Hot → fi increase
X<0
–
Feedback signal
(measured value)
Deviation
Measured value
Measured value
Deviation
Deviation
Positive
Parameter
Set point
t
I000047C
Set point
t
I000048C
Negative