Scaling Of Preset References And Bus References; Scaling Of Analog And Pulse References And Feedback - Danfoss VLT Decentral Drive FCD 302 Design Manual

Product Overview
2.3.2 Scaling of Preset References and Bus
References
Preset references are scaled according to the following
rules:
•
When 3-00 Reference Range: [0] Min to 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 (3-03 Maximum Reference ), abs
(3-02 Minimum Reference)).
•
When 3-00 Reference Range: [1] -Max to +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 3-00 Reference Range: [0] Min to 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 3-00 Reference Range: [1] -Max to +Max
-100% reference equals -Max Reference 100%
reference equals Max Reference.
2.3.3 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 Illustration 2.13) are
clamped whereas a feedback above or below is not.
Resource output
(RPM)
High reference/feedback
1500
value
Terminal X low
0
-10 -6
P1
Low reference/feedback value
-600
-1500
Illustration 2.13 Scaling of Analog and Pulse References and
Feedback
®
VLT Decentral Drive FCD 302
Illustration 2.14 Scaling of Reference Output
The endpoints P1 and P2 are defined by the following
parameters depending on which analog or pulse input is
used.
P2
Resource
input
8 10 (V)
Terminal X
high
®
MG04H102 - VLT is a registered Danfoss trademark
Resource output
(RPM)
High reference/feedback
1500
value
Terminal X low
0
-10 -6
P1
-600 Low reference/feedback value
-1500
2
P2
Resource
input
8 10 (V)
Terminal X
high
19
2