Dead Band Around Zero - Danfoss VLT FC 360 Design Manual

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2.4.4 Dead Band Around Zero

In some cases the reference (in rare cases also the
feedback) should have a dead band around zero (i.e. to
make sure the machine is stopped when the reference is
"near zero").
To make the dead band active and to set the amount of
dead band, the following settings must be done:
•
Either minimum reference value (see Table 2.2 for
relevant parameter) or maximum reference value
must be zero. In other words; Either P1 or P2
must be on the X-axis in Illustration 2.9.
•
And 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 2.9.
Resource output
Quadrant 2
[Hz] or "No unit"
50
High reference/feedback
value
P1
0
Low reference/feedback
value
1
Terminal low
-50
Quadrant 3
Illustration 2.9 Size of Dead Band
®
VLT AutomationDrive FC 360 Design Guide
Quadrant 1
P2
forward
Resource input
[mA]
16 20
Terminal X high
reverse
Quadrant 4
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MG06B202 - VLT is a registered Danfoss trademark
2 2
21