Danfoss VLT FCD 303 Operating Instructions Manual page 73

427 U3 voltage
(U3 VOLTAGE)
Value:
0.0 - 999.0 V
Function:
See parameter 423 U1 voltage.
Description of choice:
Set the output voltage (U3) that is to match the third
output frequency (F3), parameter 428 F3 frequency .
428 F3 frequency
(F3 FREQUENCY)
Value:
Par. 426 F2 frequency - 1000 Hz
Function:
See parameter 423 U1 voltage.
Description of choice:
Set the output frequency (F3) that is to match the third
output voltage (U3), parameter 427 U3 voltage .
NB!:
Parameters 437-444 are only used
if in parameter 100 Configuration a
selection has been made of Process
regulation, closed loop. [3].
437 Process PID normal/inverse control
(PROC NO/INV CTRL)
Value:
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 deviation between the reference/setpoint
and the actual process mode.
Description of choice:
If the frequency converter is to reduce
the output frequency in case the feed-
back signal increases, select Normal [0].
If the frequency converter is to increase the
output frequency in case the feedback signal
increases, select Inverse [1].
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.B7.02 - VLT is a registered Danfoss trademark
par. 103
Par. 104 Motor frequency
[0]
[1]
®
VLT FCD Series
438 Proces PID anti windup
(PROC ANTI WINDUP)
Value:
Not acti v e (DISABLE)
Acti v e (ENABLE)
Function:
It is possible to select whether the process regulator is
to continue regulating on a deviation even if it is not
possible to increase/reduce the output frequency.
Description of choice:
The factory setting is Enable [1], which means that
the integration link is initialised in relation to the
actual output frequency if either the current limit, the
voltage 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 the deviation, even if it is not
possible to remove the fault by such control.
NB!:
If Disable [0] is selected, it will mean that when
the deviation 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 in output frequency occurs.
439 Process PID start frequency
(PROC START VALUE)
Value:
f - f (parameter 201/202)
MIN MAX
Par. 201 Output frequency, low limit, f
Function:
When the start signal comes, the frequency converter
will react in the form of Open loop and will not
change to Closed loop until the programmed start
frequency is reached. This makes it 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.
Description of choice:
Set the required start frequency.
[0]
[1]
MIN
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