Danfoss VLT Programming Manual page 66

Parameter Description
3.7.6 5-5* Pulse Input
The pulse input parameters are used to define an
appropriate window for the impulse reference area by
configuring the scaling and filter settings for the pulse
inputs. Input terminals 29 or 33 act as frequency reference
inputs. Set terminal 29 (5-13 Terminal 29 Digital Input) or
terminal 33 (5-15 Terminal 33 Digital Input) to Pulse input [32].
If terminal 29 is used as an input, then set 5-02 Terminal 29
Mode to Input [0].
Ref.
(RPM)
High
ref.
value
P 5-53/
p 5-58
Low
ref.
value
P 5-52/
p 5-57
Low freq.
P 5-50/
P 5-55
5-50 Term. 29 Low Frequency
Range: Function:
100 Hz [0 - 110000 Enter the low frequency limit
*
Hz] corresponding to the low motor shaft
speed (i.e. low reference value) in
5-52 Term. 29 Low Ref./Feedb. Value. Refer
to the diagram in this section.
5-51 Term. 29 High Frequency
Range: Function:
100 Hz [0 - 110000 Hz] Enter the high frequency limit
*
corresponding to the high motor shaft
speed (i.e. high reference value) in
5-53 Term. 29 High Ref./Feedb. Value.
5-52 Term. 29 Low Ref./Feedb. Value
Range:
0.000 [-999999.999 - Enter the low reference value limit
*
999999.999 ] for the motor shaft speed [RPM].
This is also the lowest feedback
value, see also 5-57 Term. 33 Low
Ref./Feedb. Value.
5-53 Term. 29 High Ref./Feedb. Value
Range:
100.000 [-999999.999 -
*
999999.999 ]
®
VLT HVAC Drive Programming Guide
High freq. Input
P 5-51/ (Hz)
P 5-56
Function:
Function:
Enter the high reference value
[RPM] for the motor shaft speed
and the high feedback value, see
also 5-58 Term. 33 High Ref./Feedb.
Value.
®
MG.11.CB.02 - VLT is a registered Danfoss trademark
5-54 Pulse Filter Time Constant #29
Range: Function:
100 ms [1 - 1000 Enter the pulse filter time constant. The pulse
*
ms] filter dampens oscillations of the feedback
signal, which is an advantage if there is a lot
of noise in the system. A high time constant
value results in better dampening but also
increases the time delay through the filter.
This parameter cannot be adjusted while the
motor is running.
5-55 Term. 33 Low Frequency
Range: Function:
100 Hz [0 - 110000 Hz] Enter the low frequency corresponding
*
to the low motor shaft speed (i.e. low
reference value) in 5-57 Term. 33 Low
Ref./Feedb. Value.
5-56 Term. 33 High Frequency
Range: Function:
100 Hz [0 - 110000 Hz] Enter the high frequency
*
corresponding to the high motor shaft
speed (i.e. high reference value) in
5-58 Term. 33 High Ref./Feedb. Value.
5-57 Term. 33 Low Ref./Feedb. Value
Range: Function:
0.000 [-999999.999 - Enter the low reference value [RPM]
*
999999.999 ] for the motor shaft speed. This is
also the low feedback value, see
also 5-52 Term. 29 Low Ref./Feedb.
Value.
5-58 Term. 33 High Ref./Feedb. Value
Range:
100.000 [-999999.999 -
*
999999.999 ]
5-59 Pulse Filter Time Constant #33
Range: Function:
100 ms [1 - 1000 Enter the pulse filter time constant. The low-
*
ms] pass filter reduces the influence on and
dampens oscillations on the feedback signal
from the control.
This is an advantage, e.g. if there is a great
amount on noise in the system. This
parameter cannot be adjusted while the
motor is running.
Function:
Enter the high reference value
[RPM] for the motor shaft speed.
See also 5-53 Term. 29 High Ref./
Feedb. Value.
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