Specifications

7.11.3 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
means of 2’s complement. The Actual Output frequency (MAV) is scaled in the same way as the bus reference.
Actual output
freq.
STW
Slave-master
Speed ref.CTW
Master-slave
16bit
130BA276.10
Illustration 7.18 Speed Reference
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 Pa
r.3-03
Par.3-03
(4000hex)(0hex)
0%100%
Par.3-02
130BA277.10
Illustration 7.19 Reference and MAV scaling
Installation and Set-up VLT® HVAC Drive FC 102 Design Guide
182 MG16C102 - Rev. 2013-08-20
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