Description of choice:
If a time constant (t) of 100 ms is programmed, the cut-
off frequency for the lowpass filter will be 1/0.1 = 10
RAD/sec., corresponding to (10 / 2 x
π
) = 1.6 Hz. The
PID regulator will then only regulate a feedback signal
that varies with a frequency of less than 1.6 Hz. If the
feedback signal varies by a higher frequency than 1.6
Hz, it will be dampened by the lowpass filter.
423
U1 voltage
(U1 voltage)
Value:
0.0 - 999.0 V
par. 103
Function:
Parameters 423-428 are used when in parameter 101
Torque characteristic
a selection has been made of
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
Par. 104
Motor fre-
quency
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
par. 103
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
Par. 104
Motor fre-
quency
Function:
See parameter 423
U1 voltage
.
Description of choice:
Set the output frequency (F2) that is to match the sec-
ond output voltage (U2), parameter 425
U2 voltage
.
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.E2.02 - VLT is a registered Danfoss trademark
101
Pr
ogr
a
mmi
ng
