GE AF-650 GP - Service Functions and System Inputs;Outputs; Service Functions Overview

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. AN-14 Ter-
minal 53 Low
Ref./Feedb. Val-
ue
Par. AN-14 Termi-
nal 53 Low Ref./
Feedb. Value
Par. AN-24 Ter-
minal 54 Low
Ref./Feedb. Val-
ue
Par. AN-24 Termi-
nal 54 Low Ref./
Feedb. Value
Par. E-62 Term. 29
Low Ref./Feedb.
Value
Par. E-67 Term. 33 Low
Ref./Feedb. Value
Minimum input value Par. AN-10 Ter-
minal 53 Low
Voltage [V]
Par. AN-12 Termi-
nal 53 Low Current
[mA]
Par. AN-20 Ter-
minal 54 Low
Voltage [V]
Par. AN-22 Termi-
nal 54 Low Cur-
rent [mA]
Par. E-60 Term. 29
Low Frequency
[Hz]
Par. E-65 Term. 33 Low
Frequency [Hz]
P2 = (Maximum input value, Maximum reference value)
Maximum reference value Par. AN-15 Ter-
minal 53 High
Ref./Feedb. Val-
ue
Par. AN-15 Termi-
nal 53 High Ref./
Feedb. Value
Par. AN-25 Ter-
minal 54 High
Ref./Feedb. Val-
ue
Par. AN-25 Termi-
nal 54 High Ref./
Feedb. Value
Par. E-63 Term. 29
High Ref./Feedb.
Value
Par. E-68 Term. 33 High
Ref./Feedb. Value
Maximum input value Par. AN-11 Ter-
minal 53 High
Voltage [V]
Par. AN-13 Termi-
nal 53 High Cur-
rent [mA]
Par. AN-21 Ter-
minal 54 High
Voltage[V]
Par. AN-23 Termi-
nal 54 High Cur-
rent[mA]
Par. E-61 Term. 29
High Frequency
[Hz]
Par. E-66 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.
AF-650 GP Design Guide
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