137
4
PARAMETERS
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.
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.
Relationships between deviation and manipulated variable (output frequency)
Deviation
Positive
Negative
Reverse
action
Forward
action
Set point
X
>
0
X
<
0
Feedback signal
(Process value)
+
−
[Heating]
Deviation
Process value
Set point
Cold
→
up
Hot
→
down
+
−
[Cooling]
Set point
X
>
0
X
<
0
Feedback signal
(Process value)
Set point
Process value
Deviation
Too cold
→
down
Hot
→
up
M4500E.book 137 ページ 2005年2月22日 火曜日 午後5時7分
Summary of Contents for M4000E series
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Page 23: ...12 MEMO ...
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Page 199: ...188 MEMO ...