Mitsubishi Electric FR-E500 Instruction Manual page 148

4) Reverse action
Increases the manipulated variable (output frequency) if deviation X (set point -
process value) is positive, and decreases the manipulated variable if deviation is
negative.
[Heating]
+
Set point
Process value
5) Forward action
Increases the manipulated variable (output frequency) if deviation X (set point -
process value) is negative, and decreases the manipulated variable if deviation is
positive.
Set point
Process value
Relationships between deviation and manipulated variable (output frequency)
Reverse
action
Forward
action
Cold → fi up
X>0
X <0
Hot → fi down
−
[Cooling]
Too cold → fi down
+
X > 0
X< 0 Hot → fi up
−
Deviation
Positive Negative
Ò Ô
Ô Ò
133
PARAMETERS
Deviation
Process value
Set point
Set point
Process value
Deviation
4