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

Application Setup Examples

6.4.3 Reference Limits

F-50 Reference Range, F-52 Minimum Reference and
F-53 Maximum Reference together 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 below.
6 6
Figure 6.12
Figure 6.13
The value of F-52 Minimum Reference cannot be set to less
than 0, unless 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
as shown in Figure 6.14.
6-12
TM
AF-650 GP Design and Installation Guide
Figure 6.14 Sum of all References
6.4.4 Scaling of Preset References and Bus
References
Preset references are scaled according to the following
rules:
•
•
Bus references are scaled according to the following rules:
•
•
DET-767A
When F-50 Reference Range : [0] Min - Max 0%
reference equals 0 [unit] where unit can be any
unit, e.g., rpm, m/s, bar, etc. 100% reference
equals the Max (abs (F-53 Maximum Reference),
abs (F-52 Minimum Reference)).
When F-50 Reference Range : [1] -Max - +Max 0%
reference equals 0 [unit] -100% reference equals -
Max Reference 100% reference equals Max
Reference.
When 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 F-50 Reference Range: [1] -Max - +Max
-100% reference equals -Max Reference 100%
reference equals Max Reference.