Danfoss VLT AutomationDrive, Design Manual, Page: 27 / 281

The endpoints P1 and P2 are defined by the following parameters depending on which analog or pulse input is used
Analog 53
S201=OFF
Analog 53
S201=ON
Analog 54
S202=OFF
Analog 54
S202=ON
Pulse Input 29 Pulse Input 33
P1 = (Minimum input value, Minimum reference value)
Minimum reference value
6-14 Terminal 53
Low Ref./Feedb.
Value
6-14 Terminal 53
Low Ref./Feedb.
Value
6-24 Terminal 54
Low Ref./Feedb.
Value
6-24 Terminal 54
Low Ref./Feedb.
Value
5-52 Term. 29 Low
Ref./Feedb. Value
5-57 Term. 33 Low Ref./
Feedb. Value
Minimum input value 6-10 Terminal 53
Low Voltage [V]
6-12 Terminal 53
Low Current [mA]
6-20 Terminal 54
Low Voltage [V]
6-22 Terminal 54
Low Current [mA]
5-50 Term. 29 Low
Frequency [Hz]
5-55 Term. 33 Low
Frequency [Hz]
P2 = (Maximum input value, Maximum reference value)
Maximum reference value
6-15 Terminal 53
High Ref./Feedb.
Value
6-15 Terminal 53
High Ref./Feedb.
Value
6-25 Terminal 54
High Ref./Feedb.
Value
6-25 Terminal 54
High Ref./Feedb.
Value
5-53 Term. 29
High Ref./Feedb.
Value
5-58 Term. 33 High Ref./
Feedb. Value
Maximum input value 6-11 Terminal 53
High Voltage [V]
6-13 Terminal 53
High Current [mA]
6-21 Terminal 54
High Voltage [V]
6-23 Terminal 54
High Current [mA]
5-51 Term. 29
High Frequency
[Hz]
5-56 Term. 33 High
Frequency [Hz]
3.3.4 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 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
Illustration 3.6 .
(RPM)
Resource output
Resource
input
Quadrant 2
Quadrant 3
Quadrant 1
Quadrant 4
Terminal X
low
Terminal X
high
Low reference/feedback
value
High reference/feedback
value
-1 1
130BA179.10
-1500
-6 6
(V)
1500
-10 10
P1
P2
0
(RPM)
Resource output
Resource
input
Quadrant 2
Quadrant 3
Quadrant 1
Quadrant 4
Terminal X
low
Terminal X
high
Low reference/feedback
value
High reference/feedback
value
-1 1
130BA180.10
-1500
-6 6
(V)
1500
-10 10
P1
P2 0
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 FC 300 Design Guide
26 MG.33.BD.02 - VLT
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