Danfoss VLT AutomationDrive FC 301 Design Manual page 34

Basic Operating Principles
The size of the dead band is defined by either P1 or P2 as
shown in Illustration 3.19.
Quadrant 2
3 3
High reference/feedback
value
Low reference/feedback
value
-10 -6
Quadrant 3
Illustration 3.19 Dead Band
Quadrant 2
High reference/feedback
value
-10 -6
Terminal X
low
Quadrant 3
Illustration 3.20 Reverse Dead Band
Thus a reference endpoint of P1 = (0 V, 0 RPM) does not
result in any dead band, but a reference endpoint of e.g.
P1 = (1 V, 0 RPM) results in a -1 V to +1 V dead band in
this case provided that the end point P2 is placed in either
Quadrant 1 or Quadrant 4.
32
Resource output
(RPM)
P2
1500
Resource
input
0 P1
-1 1 6
Terminal X Terminal X
low high
-1500
Resource output
(RPM)
1500
Low reference/feedback
P1
value
Resource
P2 0
input
-1 1 6
Terminal X
high
-1500
®
VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
Quadrant 1
(V)
10
Quadrant 4
Quadrant 1
(V)
10
Quadrant 4
MG33BF02 - Rev. 2013-12-20