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Mitsubishi Electric FR-E520 Instruction Manual Page 160

Transistorized inverter.
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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.
+
Set point
Feedback signal
(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
Feedback signal
(Process value)
Relationships between deviation and manipulated variable (output frequency)
Reverse
action
Forward
action
[Heating]
Cold → up
X>0
Hot → down
X<0
[Cooling]
Too cold → down
+
X>0
X<0
Hot → up
Deviation
Positive
Negative
&
'
150
Deviation
Process value
Process value
Deviation
'
&
PARAMETERS
Set point
Set point

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