N700E INSTRUCTION MANUAL
3-26
A65
Fan Operation Mode
0: Always On
1: On Only when VFD is running FAN is running for 30 sec after VFD stop
Select fan operation
Related Parameters:
A70 ~ A85
Proportional, Integral, Differential (PID) Function
The PID function enables the system running at the set point automatically by regulating the process
using the system feedback, error term. It is used for Cubic Feet of Air it moves per minute (CFM) for fan
application, Gallons per minute (GPM) for pump application, pressure control, heating application, etc.
Process
Proportional
Integral
Derivative
Current Error
Accumulated Past Error
Predicts Future Error
Based on current rate
of changes
Error
,
e
(
t
)
Set Point
+
_
Basic PID Overview
P
0
= K
p
e(t)
I
0
= K
i
D
0
= K
d
d
dt
e(t)
t
o
e(t) dt
u
(
t
)
u(t ) =
K
p
e(t)
K
i
t
o
e(t) dt
K
d
d
dt
e
(
t
)
+
+
PID Functional Description
Set Point: Desired System Output Value
Error: Difference between System output and Set Point
Proportional (P) Term: Current Error
Integral (I) Term: Accumulated Past Error
Derivative (D) Term: Predicted Future Error based on current rate of changes
A70
PID Function Select
0: PID Control Disabled
1: PID Control Enabled
2: Forward Feed Enabled
Select PID function type
Related Parameters: A70~A85
A71
PID Setpoint
Range: 0.00 ~ 100.0 % in 0.01 %
PID target value setpoint
Related Parameters: A70~A85
A72
PID Setpoint Source
0: Keypad Potentiometer
1: Input Terminal
2: Keypads(Up/Down Keys)
3: Remote Control (Communication)
Select PID Setpoint Source
Related Parameters: A70~A85