Dead Band Around Zero - Danfoss VLT AutomationDrive FC 360 Design Manual

Product Overview

2.4.4 Dead Band Around Zero

2 2
In some cases, the reference (in rare cases also the
feedback) should have a dead band around 0 (i.e. to make
sure 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 2.3 for relevant parameter) or maximum
reference value at 0. In other words, either P1 or
P2 must be on the X-axis in Illustration 2.21.
•
Ensure that both points defining the scaling
graph are in the same quadrant.
The size of the dead band is defined by either P1 or P2 as
shown in Illustration 2.21.
Quadrant 2
High reference/feedback
value
Low reference/feedback
value
Quadrant 3
Illustration 2.21 Size of Dead Band
26
Design Guide
Resource output
Quadrant 1
[Hz] or "No unit"
50
P2
forward
P1
0
1 16
Terminal X high
Terminal low
-50
reverse
Quadrant 4
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Resource input
[mA]
20
MG06B402