Dead Band Around Zero - Danfoss FC 300 Design Manual

FC 300 Design Guide
P1 = (Minimum input value, Minimum reference value)
Minimum reference value
Minimum input value
P2 = (Maximum input value, Maximum reference value)
Maximum reference value
Maximum input value
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 above for relevant parameter) or Maximum Reference Value
•
must be zero. In other words; Either P1 or P2 must be on the X-axis in the graph below.
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 the graph below.
Thus a reference endpoint of P1 = (0 V, 0 RPM) will not result in any dead band, but a reference
endpoint of e.g. P1 = (1V, 0 RPM) will result in a -1V to +1V dead band in this case provided
that the end point P2 is placed in either Quadrant 1 or Quadrant 4.
Introduction to FC 300
Analog 53 Analog 53
S201=OFF S201=ON
Par. 6-14 Par. 6-14
Par. 6-10 Par. 6-12
[V] [mA]
Par. 6-15 Par. 6-15
Par. 6-11 Par. 6-13
[V] [mA]
MG.33.B6.22 - VLT is a registered Danfoss trademark
Analog 54 Analog 54
S202=OFF S202=ON
Par. 6-24 Par. 6-24
Par. 6-20 Par. 6-22
[V] [mA]
Par. 6-25 Par. 6-25
Par. 6-21 Par. 6-23
[V] [mA]
Pulse Input Pulse Input
29 33
Par. 5-52 Par. 5-57
Par. 5-50 Par. 5-55
[Hz] [Hz]
Par. 5-53 Par. 5-58
Par. 5-51 Par. 5-56
[Hz] [Hz]
27