Bus Speed Reference Value - Danfoss VLT AutomationDrive FC 360 Design Manual

RS485 Installation and Set-...

5.11.3 Bus Speed Reference Value

Speed reference value is transmitted to the frequency converter in a relative value in %. The value is transmitted in the form
of a 16-bit word; in integers (0–32767) the value 16384 (4000 hex) corresponds to 100%. Negative figures are formatted by
2's complement. The actual output frequency (MAV) is scaled in the same way as the bus reference.
Illustration 5.15 Actual Output Frequency (MAV)
The reference and MAV are scaled as follows:
(C000hex)
Par.3-00 set to
(1) -max- +max
Par.3-03
Max reference
Par.3-00 set to
(0) min-max
Illustration 5.16 Reference and MAV
MG06B402
Design Guide
Master-follower
CTW
Follower-master
STW
-100%
Reverse
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16bit
Speed ref.
Actual output
freq.
0%
(0hex)
Forward
0
0%
(0hex)
Forward
Par.3-02
Min reference
5
100%
(4000hex)
Par.3-03
Max reference
100%
(4000hex)
Par.3-03
Max reference
77
5