Danfoss VLT HVAC Drive FC 102 Design Manual page 242

Appendix
14.11.3 Bus Speed Reference Value
Speed reference value is transmitted to the drive 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
Follower-slave
STW
Illustration 14.18 Bus Speed Reference Value
The reference and MAV are scaled as shown in Illustration 14.19.
Par.3-00 set to
(1) -max- +max
Par.3-00 set to
(0) min-max
14 14
Illustration 14.19 Reference and MAV
240
®
VLT HVAC Drive FC 102
16bit
Speed reference
Actual output
frequency
-100%
(C000hex)
Reverse
Par.3-03
Max reference
Danfoss A/S © 11/2017 All rights reserved.
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
MG16C302