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VLT
®
HVAC Drive Programming Guide
3.7.7 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 (par.5-13
Terminal 33 Digital Input
Pulse input
5-15
) to
5-50 Term. 29 Low Frequency
Range:
100 Hz*
[0 - 110000 Hz]
5-51 Term. 29 High Frequency
Range:
100 Hz*
[0 - 110000 Hz]
5-52 Term. 29 Low Ref./Feedb. Value
Range:
0.000 N/A*
[-999999.999 - 999999.999 N/A]
5-53 Term. 29 High Ref./Feedb. Value
Range:
100.000 N/
[-999999.999 - 999999.999 N/A]
A*
5-54 Pulse Filter Time Constant #29
Range:
100 ms*
[1 - 1000 ms]
5-55 Term. 33 Low Frequency
Range:
100 Hz*
[0 - 110000 Hz]
[32]. If terminal 29 is used as an input, then set par.5-02
Function:
Enter the low frequency limit corresponding to the low motor shaft speed (i.e., low reference value)
in par.5-52
Term. 29 Low Ref./Feedb. Value
Function:
Enter the high frequency limit corresponding to the high motor shaft speed (i.e. high reference
value) in par.5-53
Term. 29 High Ref./Feedb. Value
Function:
Enter the low reference value limit for the motor shaft speed [RPM]. This is also the lowest feedback
Term. 33 Low Ref./Feedb. Value
value, see also par.5-57
Function:
Enter the high reference value [RPM] for the motor shaft speed and the high feedback value, see
Term. 33 High Ref./Feedb. Value
also par.5-58
Function:
Enter the pulse filter time constant. The pulse 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 damping, but also increases the time delay through the filter.
This parameter cannot be adjusted while the motor is running.
Function:
Enter the low frequency corresponding to the low motor shaft speed (i.e., low reference value) in
Term. 33 Low Ref./Feedb. Value
par.5-57
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3 Parameter Description
Terminal 29 Digital Input
) or terminal 33 (par.
Terminal 29 Mode
Input
to
. Refer to the diagram in this section.
.
.
.
.
[0].
3
3-75
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