10.13.3 Bus Speed Reference Value
Speed reference value is transmitted to the adjustable frequency drive in a relative value expressed as %. 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.
Actual output
freq.
STW
Follower-master
Speed ref.CTW
Master-follower
16bit
130BA276.11
Figure 10.17 Bus Speed Reference Value
The reference and MAV are scaled as showed in Figure 10.18.
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
Figure 10.18 Reference and MAV
RS-485 Installation and Set... Design Guide
284 Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG34S222
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