Danfoss FCM 300 Series Design Manual page 60

Select parameter 002 as Remote control
If parameter 100 is selected as Speed regulation, open
loop, the unit selected in parameter 416 can be used in
displays (par. 009-12 Feedback [unit]) of process
parameters.
Note: The reference can only be shown in Hz (Speed
regulation, open loop).
If parameter 100 is selected as Process regulation,
closed loop, the unit selected in parameter 416 will
be used when displaying both reference (par. 009-
12: Reference [unit]) and feedback (par. 009-12:
Feedback [unit]).
Select parameter 002 as Local control
If parameter 013 is chosen as LCP control and open
loop or LCP digital control and open loop, the
reference will be given in Hz, regardless of the choice
made in parameter 416. If parameter 013 is chosen
as LCP control/as par. 100 or LCP digital control/as
par. 100, the unit will be as described above under
parameter 002, Remote-control.
NB!
The above applies to display of Reference
[unit] and Feedback [unit]. If Reference [%] or
Feedback [%] is selected, the value displayed
will be in the form of a percentage of the selected
range.
Description of choice:
Select the desired unit for the reference/feedback
signal.
437 Process PID Normal/inverse control
(PROC NO/INV CTRL)
Settings:
Normal (NORMAL)
Inverse (INVERSE)
Function:
It is possible to choose whether the process regulator
is to increase/reduce the output frequency if there is a
difference between the reference signal and the
feedback signal.
Used together with Process, closed loop mode
(parameter 100).
Description of choice:
If the FC motor is to reduce the output frequency in
case the feedback signal increases, select Normal [0].
If the FC motor is to increase the output frequency in
case the feedback signal increases, select Inverse [1].
= factory setting. ( ) = parameter window text. [ ] = value for use in communication via serial communication port
60
FCM 300 Series
438 Process PID anti windup
(PROC ANTI WINDUP)
Settings:
Disable (DISABLE)
Enable (ENABLE)
Function:
It is possible to select whether the process regulator
is to continue regulating on an error even if it is not
possible to increase/reduce the output frequency.
Used together with Process, closed loop mode
(parameter 100).
Description of choice:
The factory setting is Enable [1], which means that
the integration link is adjusted in relation to the actual
output frequency if either the current limit or the max./
min. frequency has been reached. The process
regulator will not engage again until either the error is
zero or its sign has changed.
Select Disable [0] if the integrator is to continue
integrating on an error, even if it is not possible to
remove the fault by such regulation.
NB! NB!
NB! NB! NB!
If Disable [0] is selected, it will mean that when
the error changes its sign, the integrator will
first have to integrate down from the level obtained
as a result of the former error, before any change to
the output frequency occurs.
439 Process PID start frequency
(PROC START VALUE)
Settings:
f -f (parameter 201 and 202)
[0]
MIN MAX
parameter 201
[1]
Function:
When the start signal comes, the FC motor will react
in the form of Speed, open loop mode following the
ramp. Only when the programmed start frequency
has been obtained, will it change over to Process,
closed loop mode. In addition, it is possible to set a
frequency that corresponds to the speed at which the
process normally runs, which will enable the required
process conditions to be reached sooner.
Used together with Process, closed loop mode
(parameter 100).
MG.03.B6.02 - VLT is a registered Danfoss trademark
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