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

FC 300 Design Guide

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.
The endpoints P1 and P2 are defined by the following parameters depending on which analog or pulse input is used
Analog 53
S201=OFF
P1 = (Minimum input value, Minimum reference value)
Minimum reference value par. 6-14
minal 53 Low
Ref./Feedb.
Value
Minimum input value par. 6-10
minal 53 Low
Voltage
P2 = (Maximum input value, Maximum reference value)
Maximum reference value par. 6-15
minal 53 High
Ref./Feedb.
Value
Maximum input value par. 6-11
minal 53 High
Voltage

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.
Analog 53 Analog 54
S201=ON S202=OFF
Ter- Termi-
par. 6-14 par. 6-24
nal 53 Low Ref./ minal 54 Low
Feedb. Value Ref./Feedb.
Value
Ter- par. 6-12 Termi- par. 6-20
nal 53 Low Cur- minal 54 Low
rent Voltage
[V] [mA]
Ter- Termi-
par. 6-15 par. 6-25
nal 53 High Ref./ minal 54 High
Feedb. Value Ref./Feedb.
Value
Ter- Termi-
par. 6-13 par. 6-21
nal 53 High Cur- minal 54 High
rent Voltage
[V] [mA] [V]
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3 Introduction to AutomationDrive FC 300
Analog 54 Pulse Input 29
S202=ON
Ter- Termi-
par. 6-24 par. 5-52
nal 54 Low Ref./ 29 Low Ref./
Feedb. Value Feedb. Value
Ter- par. 6-22 Termi- par. 5-50
nal 54 Low Cur- 29 Low Frequen-
rent cy
[V] [mA] [Hz]
Ter- Termi-
par. 6-25 par. 5-53
nal 54 High Ref./ 29 High Ref./
Feedb. Value Feedb. Value
Ter- Termi-
par. 6-23 par. 5-51
nal 54 High Cur- 29 High Fre-
rent quency
[mA] [Hz]
Pulse Input 33
Term. Term. 33
par. 5-57
Low Ref./Feedb. Value
Term. par. 5-55 Term. 33
Low Frequency
[Hz]
Term. Term. 33
par. 5-58
High Ref./Feedb. Val-
ue
Term. Term. 33
par. 5-56
High Frequency [Hz]
3
27