Bus Speed Reference Value - Danfoss VLT AQUA Drive FC 202 Design Manual

RS-485 Installation and Set...

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
with 2's complement. The Actual Output frequency (MAV) is scaled in the same way as the bus reference.
Master-slave
CTW Speed ref.
Slave-master
Actual output
STW
freq.
Illustration 7.18 Bus Speed Reference Value
The reference and MAV are scaled as showed in Illustration 7.19.
(C000hex)
Par.3-00 set to
(1) -max- +max
Par.3-03
Max reference
Par.3-00 set to
(0) min-max
Illustration 7.19 Reference and MAV
®
VLT AQUA Drive FC 202 Design Guide
16bit
-100%
Reverse
®
MG20Z102 - VLT is a registered Danfoss trademark
0%
(0hex)
Forward
0
0%
(0hex)
Forward
Par.3-02
Min reference
7
100%
(4000hex)
Par.3-03
Max reference
100%
(4000hex)
Par.3-03
Max reference
183
7