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 ) = 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
101Torque 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 frequency
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 Mo-
tor frequency
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.A2.22 - VLT
®
is a registered Danfoss trademark 73
Programming
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