VLT
®
8000 AQUA
Example - control word and serial communication ref.:
The AFD must receive a start command, and
the reference is to be set to 50 % (2000 Hex)
of the reference range.
Control word = 047F Hex. Start command
Reference = 2000 Hex. 50 % reference
The AFD is to receive a start command, and
the reference is to be set to -50 % (-2000
Hex) of the reference range.
The reference value is first converted to the
first complement; then 1 binary is added
to get 2
’
s complement:
2000 Hex =
0010 0000 0000 0000 binary
´1
komplement
=
1101 1111 1111 1111 binary
+ 1 binary
´2
komplement
=
1110 0000 0000 0000 binary
Control word = 047F Hex. Start command
Reference = E000 Hex. -50 % reference
■
Present output frequency
The value of the present output frequency of the
AFD at any given time is transmitted as a 16-bit
word. The value is transmitted in the form of
whole numbers 0 -± 32767 (±200 %).
16384 (4000 Hex) corresponds to 100 %.
The output frequency has the following format:
0-16384 (4000 Hex)
0-100 % (Par. 201
Output frequency low limit
- Par. 202
Output
frequency high limit
).
Example - Status word and present output frequency:
The master receives a status message from the
AFD saying that the present output frequency is
50 % of the output frequency range.
Par. 201
Output frequency low limit
=
0 Hz
Par. 202
Output frequency high limit
=
50 Hz
Status word =
0F03 Hex. Status
message
Output frequency =
2000 Hex. 50 % of the
frequency range,
corresponding to 25 Hz.
MG.80.A7.22 - VLT is a registered Danfoss trademark
152
Rosewood STP ST42 General (Operation and Maintenance Manual - Part 4:
Section 6.3 Manufacturers Manuals 6.3.33 Danfoss VLT Aquadrive 8000) Vendor Manual
QP Id: VM207
Active: 03/09/2013
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