Danfoss VLT 5000 Series Instruction Manual page 136

Description of choice:
If a time constant ( ) e.g. 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.
This means that the PID regulator will only regulate a
feedback signal that varies by a frequency of less than
1.6 Hz. If the feedback signal varies by a higher fre-
quency than 1.6 Hz, the PID regulator will not react.
422 U 0 voltage at 0 Hz
(U0 VOLTAGE (0HZ))
Value:
0.0 - parameter 103
Function:
Parameters 422-432 can be used together with Spe-
cial motor characteristics (par. 101). It is possible to
make a U/f characteristic on the basis of six definable
voltages and frequencies. Change of motor nameplate
data (parameter 102 - 106) affects parameter 422.
Description of choice:
Set the desired voltage at 0 Hz.
See the below drawing.
423 U 1 voltage
(U1 VOLTAGE)
Value:
0.0 - U Factory setting of par. 103
VLT,MAX
Function:
This parameter sets the Y-value of the 1st break point.
Description of choice:
Set the voltage desired at the F1 frequency set in pa-
rameter 424.
See drawing for parameter 422.
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.51.C5.22 - VLT is a registered Danfoss trademark.
VLT
424 F 1 frequency
(F1 FREQUENCY)
Value:
0.0 - par. 426
Function:
This parameter sets the X-value of the 1st break point.
Description of choice:
Set the frequency desired at the U1 voltage set in pa-
rameter 423.
See drawing for parameter 422.
20.0 volt
425 U 2 voltage
(U2 VOLTAGE)
Value:
0.0 - U
VLT, MAX
Function:
This parameter sets the Y-value of the 2nd break point.
Description of choice:
Set the voltage desired at the F2 frequency set in pa-
rameter 426.
See drawing for parameter 422.
426 F 2 frequency
(F2 FREQUENCY)
Value:
par. 424 - par. 428
Function:
This parameter sets the X-value of the 2nd break point.
Description of choice:
Set the frequency desired at the U2 voltage set in pa-
rameter 425.
See drawing for parameter 422.
427 U 3 voltage
(U3 VOLTAGE)
Value:
0.0 - U
VLT,MAX
®
5000 Series
Factory setting of par. 104
Factory setting of par. 103
Factory setting of par. 104
Factory setting of par. 103
133