Danfoss VLT Midi Drive FC 280 Design Guide

The endpoints P1 and P2 are dened in Table 2.4 depending on the choice of input.
Input Analog 53
voltage mode
Analog 54
voltage mode
Analog 54
current mode
Pulse Input 29 Pulse Input 33
P1=(Minimum input value, minimum reference value)
Minimum reference value Parameter 6-14 Te
rminal 53 Low
Ref./Feedb. Value
Parameter 6-24 Te
rminal 54 Low
Ref./Feedb. Value
Parameter 6-24 Ter
minal 54 Low Ref./
Feedb. Value
Parameter 5-52 Ter
m. 29 Low Ref./
Feedb. Value
Parameter 5-57 Term. 33
Low Ref./Feedb. Value
Minimum input value Parameter 6-10 Te
rminal 53 Low
Voltage [V]
Parameter 6-20 Te
rminal 54 Low
Voltage [V]
Parameter 6-22 Ter
minal 54 Low
Current [mA]
Parameter 5-50 Ter
m. 29 Low
Frequency [Hz]
Parameter 5-55 Term. 33
Low Frequency [Hz]
P2=(Maximum input value, maximum reference value)
Maximum reference value Parameter 6-15 Te
rminal 53 High
Ref./Feedb. Value
Parameter 6-25 Te
rminal 54 High
Ref./Feedb. Value
Parameter 6-25 Ter
minal 54 High Ref./
Feedb. Value
Parameter 5-53 Ter
m. 29 High Ref./
Feedb. Value
Parameter 5-58 Term. 33
High Ref./Feedb. Value
Maximum input value Parameter 6-11 Te
rminal 53 High
Voltage [V]
Parameter 6-21 Te
rminal 54 High
Voltage [V]
Parameter 6-23 Ter
minal 54 High
Current [mA]
Parameter 5-51 Ter
m. 29 High
Frequency [Hz]
Parameter 5-56 Term. 33
High Frequency [Hz]
Table 2.4 P1 and P2 Endpoints
2.4.4 Dead Band Around Zero
Sometimes, the reference (in rare cases also the feedback) should have a dead band around 0 to ensure that the machine is
stopped when the reference is near 0.
To make the dead band active and to set the amount of dead band, do the following:
•
Set either the minimum reference value (see Table 2.4 for relevant parameter) or maximum reference value at 0. In
other words, either P1 or P2 must be on the X-axis in Illustration 2.18.
•
Ensure that both points dening the scaling graph are in the same quadrant.
P1 or P2
denes the size of the dead band as shown in Illustration 2.18.
Resource output
[Hz] or “No unit”
Resource input
[mA]
Quadrant 2
Quadrant 3
Quadrant 1
Quadrant 4
Terminal X high
Low reference/feedback
value
High reference/feedback
value
1
-50
16
50
20
P1
P2
0
130BD446.10
forward
reverse
Terminal low
Illustration 2.18 Size of Dead Band
Case 1: Positive reference with dead band, digital input to trigger reverse, part I
Illustration 2.19 shows how reference input with limits inside minimum to maximum limits clamps.
Product Overview
VLT
®
Midi Drive FC 280
24 Danfoss A/S © 03/2016 All rights reserved. MG07B102
22

Danfoss VLT Midi Drive FC 280 Specifications

General

Brand	Danfoss
Model	VLT Midi Drive FC 280
Category	DC Drives
Language	English