Dead Band Around Zero - Danfoss iC2 Application Manual

Application Guide | iC2-Micro Frequency Converters
The endpoints P1 and P2 are defined in the
Table 21: P1 and P2 Endpoints
Input
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

Dead Band Around Zero

5.6.5
Sometimes, the reference (in rare cases also the feedback) should have a dead band around 0 to ensure that the machine is stopped
when the reference is near 0.
To make the dead band active and to set the amount of dead band, do the following:
Set either the minimum reference value (see the table in
l
words, either P1 or P2 must be on the X-axis in the
Ensure that both points defining the scaling graph are in the same quadrant.
l
P1 or P2 defines the size of the dead band as shown in the
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
Figure 48: Size of Dead Band
Case 1: Positive reference with dead band, digital input to trigger reverse, part I
Figure 49 shows how reference input with limits inside minimum to maximum limits clamps.
70
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Table 21 depending on the choice of input.
AI 33 voltage mode AI 34 voltage mode
P 9.5.2.7 T33 Low Ref./ P 9.5.3.7 T34 Low Ref./
Feedb. Value Feedb. Value
P 9.5.2.3 T33 Low P 9.5.3.3 T34 Low
Voltage Voltage
P 9.5.2.6 T33 High Ref./ P 9.5.3.6 T34 High Ref./
Feedb. Value Feedb. Value
P 9.5.2.2 T33 High P 9.5.3.2 T34 High
Voltage Voltage
Figure
Quadrant 1
P2
forward
Resource input
[mA]
16 20
Terminal X high
reverse
Quadrant 4
AI 34 current mode
P 9.5.3.7 T34 Low Ref./
Feedb. Value
P 9.5.3.5 T34 Low
Current
P 9.5.3.6 T34 High Ref./
Feedb. Value
P 9.5.3.4 T34 High
Current
Table 21 for relevant parameter) or maximum reference value at 0. In other
48.
Figure 48.
Pulse input 18
P 9.4.4.4 T18 Low Ref./
Feedb. Value
P 9.4.4.2 T18 Low
Frequency
P 9.4.4.3 T18 High Ref./
Feedb. Value
P 9.4.4.1 T18 High
Frequency
AB413939445838en-000301 / 130R1254