Scaling Of Preset References; Scaling Of Analog And Pulse References, And Feedback - Danfoss VLT 380-500 V Design Manual

Handling of References
P 3-00 Reference Range= [0] Min to Max
P 3-03
P 3-02
Illustration 15.4 Sum of All References

15.2 Scaling of Preset References

Preset references are indicated by units, which can be RPM,
m/s, bar, and so on. The preset references are scaled
according to the following rules:
•
When parameter 3-00 Reference Range= [0] Min to
Max , parameter 3-02 Minimum Reference is the
minimum reference (0%), and
parameter 3-03 Maximum Reference is the
maximum reference (100%). 50% reference is
found halfway between these 2 values.
•
When parameter 3-00 Reference Range=[1] -Max to
+Max , parameter 3-02 Minimum Reference is
ignored. Parameter 3-03 Maximum Reference is the
maximum reference (100%), which is used for the
+Max value (+100%) and the -Max value (-100%).
50% reference is found halfway between these 2
values.
15.3 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 15.5) are
15 15
clamped, whereas feedback above or below is not.
138
Resulting reference
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®
VLT Parallel Drive Modules
High reference/feedback
value
Terminal X low
-10
Sum of all
references
Illustration 15.5 Scaling of Analog and Pulse References
High reference/feedback
value
Terminal X low
-10
Illustration 15.6 Scaling of Analog and Pulse Feedback
The following parameters define the endpoints P1 and P2,
depending on which analog or pulse input is used.
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
MG37N102