Mitsubishi Electric 800 Series Instruction Manual page 401

• PD action
PD action is a combination of proportional action (P) and differential action (D), and applies a manipulated amount according
to the speed of the deviation to improve excessive characteristics.
[Example of action when the measured value changes proportionately]
(Note) PD action is the result of P and D actions being added together.
• PID action
PID action is a combination of PI and PD action, which enables control that incorporates the respective strengths of these
actions.
(Note) PID action is the result of all P, I and D actions being added together.
• Reverse action
When deviation X = (set point - measured value) is a plus value, the manipulated amount (output frequency) is increased, and
when the deviation is a minus value, the manipulated amount is decreased.
400
5. PARAMETERS
5.11 (A) Application parameters
P action
D action
PD
action
P action
I action
D action
PID action
[Heating]
+ X>0
Cold
Set
Hot
X<0
point
-
Feedback signal
(measured value)
Set point
Deviation
Measured value
Time
Time
Time
Set point
Deviation
Measured value
Time
Time
Time
Time
Deviation
Increase
Decrease
Measured value
Set point