Reference Limits; Scaling Of Preset References And Bus References - GE AF-650 GP Design And Installation Manual

Application Set-Up Examples

6.4.3 Reference Limits

Parameter F-50 Reference Range, parameter F-52 Minimum
Reference and parameter F-53 Maximum Reference define
the allowed range of the sum of all references. The sum of
all references is clamped when necessary. The relation
between the resulting reference (after clamping) and the
sum of all references is shown in Illustration 6.12.
6 6
Illustration 6.12 Relation between Resulting Reference and the
Sum of all References
Illustration 6.13 Resulting Reference
The value of parameter F-52 Minimum Reference cannot be
set to less than 0, unless parameter H-40 Configuration
Mode is set to [3] Process. In that case, the following
relations between the resulting reference (after clamping)
and the sum of all references is shown in Illustration 6.14.
60
Illustration 6.14 Sum of all References with
parameter H-40 Configuration Mode set to [3] Process
6.4.4 Scaling of Preset References and Bus
References
Preset references are scaled according to the following
rules:
•
When parameter F-50 Reference Range: [0] Min -
Max 0% reference equals 0 [unit] where unit can
be any unit for example, RPM, m/s, bar and so on,
100% reference equals the Max (abs
(parameter F-53 Maximum Reference), abs
(parameter F-52 Minimum Reference)).
•
When parameter F-50 Reference Range: [1] -Max -
+Max 0% reference equals 0 [unit] -100%
reference equals -Max Reference 100% reference
equals Max Reference.
Bus references are scaled according to the following rules:
•
When parameter F-50 Reference Range: [0] Min -
Max. To obtain max resolution on the bus
reference the scaling on the bus is: 0% reference
equals Min Reference and 100% reference equals
Max reference.
•
When parameter F-50 Reference Range: [1] -Max -
+Max -100% reference equals -Max Reference
100% reference equals Max Reference.
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