Danfoss VLT 2800 Series Operating Instructions Manual page 49

Special motor characteristic [8]. It is possible to deter-
mine a U/f characteristic on the basis of four definable
voltages and three frequencies. The voltage at 0 Hz is
set in parameter 133 Start voltage.
Description of choice:
Set the output voltage (U1) that is to match the first
output frequency (F1), parameter 424 F1 frequency.
424 F1 frequency
(F1 frequency)
Value:
0.0 - par. 426 F2 frequen-
cy
Function:
See parameter 423 U1 voltage .
Description of choice:
Set the output frequency (F1) that is to match the first
output voltage (U1), parameter 423 U1 voltage .
425 U2 voltage
(U2 voltage)
Value:
0.0 - 999.0 V
Function:
See parameter 423 U1 voltage.
Description of choice:
Set the output voltage (U2) that is to match the second
output frequency (F2), parameter 426 F2 frequency.
426 F2 frequency
(F2 frequency)
Value:
Par. 424 F1 frequency -
par. 428 F3 frequency
= factory setting, () = display text, [] = value for use in communication via serial communication port
48
See parameter 423 U1 voltage.
Set the output frequency (F2) that is to match the sec-
ond output voltage (U2), parameter 425 U2 voltage .
See parameter 423 U1 voltage.
Set the output voltage (U3) that is to match the third
output frequency (F3), parameter 428 F3 frequency .
Par. 104 Motor fre-
quency
See parameter 423 U1 voltage.
Set the output frequency (F3) that is to match the third
output voltage (U3), parameter 427 U3 voltage .
par. 103
It is possible to choose whether the process regulator
Par. 104 Motor fre-
is to increase/reduce the output frequency if there is a
quency
MG.27.A2.02 - VLT
®
VLT 2800 Series
Function:
Description of choice:
427 U3 voltage
(U3 voltage)
Value:
0.0 - 999.0 V
Function:
Description of choice:
428 F3 frequency
(F3 frequency)
Value:
Par. 426 F2 frequency -
1000 Hz
Function:
Description of choice:
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:
®
is a registered Danfoss trademark
par. 103
Par. 104 Motor fre-
quency
[0]
[1]