Danfoss VLT AutomationDrive FC 300 Series - Dead Band Around Zero

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]
Table 3.3 Parameters Defining the Endpoints P1 and P2 depending on which Analog or Pulse Input is used
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 3.3 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 3.15.
•
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 inIllustration 3.15.
(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
Illustration 3.15 Dead Band
Introduction
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
26 MG33BE02 - VLT
®
is a registered Danfoss trademark
3
3
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