Bus Speed Reference Value - Danfoss VLT AutomationDrive FC 300 Design Manual

RS-485 Installation and Set...

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.
Figure 10.17 Bus Speed Reference Value
The reference and MAV are scaled as showed in Figure 10.18.
Par.3-00 set to
10 10
(1) -max- +max
Par.3-00 set to
(0) min-max
Figure 10.18 Reference and MAV
284
Design Guide
Master-follower
CTW
Follower-master
STW
-100%
(C000hex)
Reverse
Par.3-03
Max reference
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
16bit
Speed ref.
Actual output
freq.
0%
(0hex)
Forward
0
0%
(0hex)
Forward
Par.3-02
Min reference
100%
(4000hex)
Par.3-03
Max reference
100%
(4000hex)
Par.3-03
Max reference
MG34S222