Scaling Of Analog And Pulse References And Feedback; Dead Band Around Zero - Danfoss FC 300 Design Manual

3 Introduction to AutomationDrive FC 300

3.3.3 Scaling of Analog and Pulse References and Feedback

References and feedback are scaled from analog and pulse inputs in the same way. The only difference is that a reference above or below the specified
minimum and maximum "endpoints" (P1 and P2 in the graph below) are clamped, whereas a feedback above or below is not.
3
The endpoints P1 and P2 are defined by the following parameters, depending on which analog or pulse input is used
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

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.
3-12
Analog 53 Analog 53
S201=OFF S201=ON
Ter- Termi-
par. 6-14 par. 6-14
minal 53 Low nal 53 Low Ref./
Ref./Feedb. Feedb. Value
Value
Ter- Termi-
par. 6-10 par. 6-12
minal 53 Low nal 53 Low Cur-
Voltage rent
[V] [mA]
par. 6-15 Ter- par. 6-15 Termi-
minal 53 High nal 53 High Ref./
Ref./Feedb. Feedb. Value
Value
par. 6-11 Ter- par. 6-13 Termi-
minal 53 High nal 53 High Cur-
Voltage [V] rent [mA]
MG.33.BC.22 - VLT
Analog 54 Analog 54
S202=OFF S202=ON
Ter- Termi-
par. 6-24 par. 6-24
minal 54 Low nal 54 Low Ref./
Ref./Feedb. Feedb. Value
Value
Ter- Termi-
par. 6-20 par. 6-22
minal 54 Low nal 54 Low Cur-
Voltage rent
[V] [mA]
par. 6-25 Ter- par. 6-25 Termi-
minal 54 High nal 54 High Ref./
Ref./Feedb. Feedb. Value
Value
par. 6-21 Ter- par. 6-23 Termi-
minal 54 High nal 54 High Cur-
Voltage [V] rent [mA]
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FC 300 Design Guide
Pulse Input 29 Pulse Input 33
Term. Term. 33
par. 5-52 par. 5-57
29 Low Ref./ Low Ref./Feedb. Value
Feedb. Value
Term. Term. 33
par. 5-50 par. 5-55
29 Low Frequen- Low Frequency [Hz]
cy
[Hz]
par. 5-53 Term. par. 5-58 Term. 33
29 High Ref./ High Ref./Feedb. Val-
Feedb. Value ue
par. 5-51 Term. par. 5-56 Term. 33
29 High Fre- High Frequency
[Hz]
quency [Hz]