Danfoss VLT HVAC Drive Metasys N2 Manual page 19

®
VLT HVAC Drive Metasys N2
Example 3:
Over-ride analog output, speed (50%)
Device address
Char1 command
Char1 subcommand
Char2 region
Char2 object number (NPA)
Char8 override value *
Checksum
Telegram code:
>XX7203004E000000<CR>
Example 4:
Bus stop, BO over-ride release com-
Device address
Char1 command
Char1 subcommand
Char2 region
Char2 object number (NPA)
Char8 override value *
Checksum
Telegram code:
>XX72040400YY <CR>
2.2.2. Scaling of Bus Reference and Feedback
Reference/feedback
20%
50%
100%
200%
-100%
-200%
Table 2.11: Reference/feedback values
The reference/feedback value is the percentage of the range of parameter 3-02 and 3-03. Values
within the ranges 100% to 200% and -200% to -100% applies only to the reference. The Float
representation of the value 200% must be limited to maximum 32767 and minimum -32768.
change command:
mand:
Scaling
20 * 16384/100
50 * 16384/100
100 * 16384/100
200 * 16384/100
-100 * 16384/100
-200 * 16384/100
MG.11.G1.02 - VLT ® is a registered Danfoss trademark
Setting:
XX
7
2
03
00
4E 00 00 00 override value = 50% speed (IEEE
floating point, format)
YY
To calculate override value for speed: refer to
Scaling of Bus Reference and Bus Feedback.
Issue an override release command through
the master to the device:
Setting:
XX
7
2
04
04 (Start)
00 (Not active)
Y
If the preceding commands were issued, the
drive should have accelerated to 50% after
the speed reference was issued. After the
override release, the drive should have stop-
ped.
Float
3276.8 454C CCCD
8192 4600 0000
16384 4680 0000
32767 46FF FE00
-16384 C680 0000
-32768 C700 0000
2. Instructions
IEEX hex
19
2