68
418
Setpoint 1
(SETPOINT 1)
Value:
Feedback Minimum to Feedback Maximum
★
0.000
Function:
Setpoint 1 is used to provide the setpoint reference for 1 setpoint PID
control and the setpoint for zone 1 in 2 setpoint PID control. External
and preset references may be added to its value.
In open loop, Setpoint 1 should be set to 0, to prevent parameter 417,
Feedback Function, from affecting the reference.
See description of parameter 417, Feedback Function.
Description of choice:
Set the required value. The process unit is selected in parameter 415,
Process Units.
419
Setpoint 2
(SETPOINT 2)
Value:
Feedback minimum to Feedback maximum
★
0.000
Function:
Setpoint 2 is used to provide the sepoint reference for zone 2 in 2 zone
PID. In open loop, Setpoint 2 should be set to 0, to prevent parameter
417, Feedback Function, from affecting the reference.
See description of parameter 417.
Description of choice:
Set the required value. The process unit is selected in parameter 415,
Process Units.
420
PID Normal/Inverse Control
(PID NOR/INV. CTRL)
Value:
★
Normal (NORMAL)
[0]
Inverse (INVERSE)
[1]
Function:
This determines how the drive’s PID controller responds to an error
between the setpoint and feedback.
Used in Closed Loop, (parameter 100).
Description of choice:
If the drive is to reduce the output frequency when the feedback signal
increases, select Normal.
If the drive is to increase the output frequency when the feedback
signal increases, select Inverse.
421
PID Anti-windup
(PID ANTI WINDUP)
Value:
Off (DISABLE)
[0]
★
On (ENABLE)
[1]
Function:
It is possible to choose whether the PID controller integrator is to
continue to sum the error signal when it is not possible to increase or
decrease the output frequency to correct the error.
Used in Closed Loop, parameter 100.
Description of choice:
The factory setting is On, which means that the error integrator is
cleared if either the current limit, the voltage limit or the maximum or
minimum frequency has been reached. The integrator will not function
again until regulation is possible. Select Off if the integrator is to
continue integrating even if it is not possible to correct the error.
422
PID Start-up Frequency
(PID START VALUE)
Value:
Minimum frequency to maximum frequency
(set by parameters 201 and 202)
★
0 Hz
Function:
The drive will react to a start signal as if in open loop following the
acceleration ramp. When the programmed start frequency has been
reached, it will change to closed loop operation. This can enable the
system to stabilize more quickly.
Used in Closed Loop, parameter 100.
Description of choice:
Set the required start frequency. For software versions prior to 2.0, do
not set this frequency between 0.1 and 7.7 Hz.
CAUTION
!
If drive is running in current limit before de-
sired start frequency is obtained, PID will not
be activated. To avoid this, start frequency must
be low enough to ensure that drive does not go
into current limit. This can be done during op-
eration.
✭
Indicates default parameter. Depending upon the application, the drive may be delivered with other parameters selected.
