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.
Actual output
freq.
STW
Follower-master
Speed ref.
CTW
Master-follower
16bit
130BA276.11
Illustration 5.15 Actual Output Frequency (MAV)
The reference and MAV are scaled as follows:
Reverse
Forward
Par.3-00 set to
(1) -max- +max
Max reference
Max reference
Par.3-00 set to
(0) min-max
Max reference
Forward
Min reference
100%
(4000hex)
-100%
(C000hex)
0%
(0hex)
Par.3-03
0
Par.3-03
Par.3-03
(4000hex)
(0hex)
0%
100%
Par.3-02
130BA277.10
Illustration 5.16 Reference and MAV
RS485 Installation and Set-...
Design Guide
MG06B402
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