Scaling Of Preset References And Bus References; Scaling Of Analog And Pulse References And Feedback - Danfoss VLT AutomationDrive FC 300 Design Manual

Product Introduction
3.3.2 Scaling of Preset References and Bus
References
Preset references
Preset references are scaled according to the following:
•
3 3 When 3-00 Reference Range: [0] Min to Max 0%
reference equals 0 [unit], where unit can be any
unit such as 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
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.
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VLT AutomationDrive FC 300 Design Guide 90-1200 kW
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 Illustration 3.14) are
clamped, whereas a feedback above or below is not.
High reference/feedback
value
Terminal X low
-10
Illustration 3.14 Scaling of Analog and Pulse References
High reference/feedback
value
Terminal X low
-10
Illustration 3.15 Scaling of Analog and Pulse Feedback
MG34S202 - Rev. 2013-08-19
Resource output
(RPM)
1500
0
-6
P1
Low reference/feedback value
-600
-1500
Resource output
(RPM)
1500
0
-6
P1
-600 Low reference/feedback value
-1500
P2
Resource
input
8 10 (V)
Terminal X
high
P2
Resource
input
8 10 (V)
Terminal X
high