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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
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
par. 6-14
Ter-
minal 53 Low
Ref./Feedb.
Value
par. 6-14
Termi-
nal 53 Low Ref./
Feedb. Value
par. 6-24
Ter-
minal 54 Low
Ref./Feedb.
Value
par. 6-24
Termi-
nal 54 Low Ref./
Feedb. Value
par. 5-52
Term.
29 Low Ref./
Feedb. Value
par. 5-57
Term. 33
Low Ref./Feedb. Value
Minimum input value
par. 6-10
Ter-
minal 53 Low
Voltage
[V]
par. 6-12
Termi-
nal 53 Low Cur-
rent
[mA]
par. 6-20
Ter-
minal 54 Low
Voltage
[V]
par. 6-22
Termi-
nal 54 Low Cur-
rent
[mA]
par. 5-50
Term.
29 Low Frequen-
cy
[Hz]
par. 5-55
Term. 33
Low Frequency
[Hz]
P2 = (Maximum input value, Maximum reference value)
Maximum reference value
par. 6-15
Ter-
minal 53 High
Ref./Feedb.
Value
par. 6-15
Termi-
nal 53 High Ref./
Feedb. Value
par. 6-25
Ter-
minal 54 High
Ref./Feedb.
Value
par. 6-25
Termi-
nal 54 High Ref./
Feedb. Value
par. 5-53
Term.
29 High Ref./
Feedb. Value
par. 5-58
Term. 33
High Ref./Feedb. Val-
ue
Maximum input value
par. 6-11
Ter-
minal 53 High
Voltage
[V]
par. 6-13
Termi-
nal 53 High Cur-
rent
[mA]
par. 6-21
Ter-
minal 54 High
Voltage
[V]
par. 6-23
Termi-
nal 54 High Cur-
rent
[mA]
par. 5-51
Term.
29 High Fre-
quency
[Hz]
par. 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.
3 Introduction to AutomationDrive FC 300
FC 300 Design Guide
3-12
MG.33.BC.22 - VLT
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is a registered Danfoss trademark
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