Danfoss VLT FCD 311 Design Manual page 90

Description of choice:
Set the output voltage (U2) that is to match the
second output frequency (F2), parameter 426 F2 fre-
quency.
426 F2 frequency
426
(F2 FREQUENCY)
Value:
Par. 424 F1 frequency - par. 428 F3 frequency
Function:
See parameter 423 U1 voltage.
Description of choice:
Set the output frequency (F2) that is to match the
second output voltage (U2), parameter 425 U2 volt-
age.
427 U3 voltage
427
(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
428
(F3 FREQUENCY)
Value:
Par. 426 F2 frequency - 1000 Hz
Par. 104 Motor frequency
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].
= factory setting. () = display text [] = value for use in communication via serial communication port
90
Par. 104 Motor frequency
par. 103
®
VLT FCD Series
437 Process PID normal/inverse control
437
(PROC NO/INV CTRL)
Value:
Normal ( NORMAL)
Inverse ( INVERSE)
Function:
It is possible to choose whether the process regula-
tor 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 fre-
quency in case the feedback signal increases, select
Normal [0].
If the frequency converter is to increase the output
frequency in case the feedback signal increases, se-
lect Inverse [1].
438 Proces PID anti windup
438
(PROC ANTI WINDUP)
Value:
Not active (DISABLE)
Active (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 ac-
tual 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.
MG.04.A1.02 - VLT is a registered Danfoss trade mark
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