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Telegram example
Example 1: For Controlling the Drive and Reading
Parameters
This telegram reads parameter 520, motor current.
Telegram to the frequency converter:
stx
lge
adr
pke
ind
pwe, high
pwe, low
pcd 1
pcd 2
bcc
02
0E
01
12
08
00
00
00
00
00
00
00
00
00
00
17
All numbers are in hex format.
The response from the frequency converter will corre-
spond to the command above, but
pwe,high
and
pwe,low
will contain the actual value of parameter 520
multiplied by 100. This means that if the actual output
current is 5.24 A then the value coming from the fre-
quency converter is 524.
Response from the frequency converter:
stx
lge
adr
pke
ind
pwe, high
pwe, low
pcd 1
pcd 2
bcc
02
0E
01
22
08
00
00
00
00
02
0C
06
07
00
00
28
All numbers are in hex format.
Pcd 1
and
pcd 2
from example 2 can be used and
added to the example which means that it will be pos-
sible to control the drive and read the current at the
same time.
Example 2: Only for Controlling the Drive
This telegram sets the control word to 047C Hex (Start
command) with a speed reference of 2000 Hex (50%).
NB!
Parameter 512 is set to FC Drive.
Telegram to the frequency converter:
stx
lge
adr
pcd 1
pcd 2
bcc
02
06
04
04
7C
20
00
58
All numbers are in hex format.
The response from the frequency converter gives in-
formation of the status of the drive when it received the
command. By sending the command again, the
pcd1
will change to the new status.
Response from the frequency converter:
stx
lge
adr
pcd 1
pcd 2
bcc
02
06
04
06
07
00
00
01
All numbers are in hex format.
Read parameter description elements
With
Read Parameter Description Elements
it is possi-
ble to read the characteristics of a parameter which
could be eg.
Name, Default value, conversion
, etc.
The table below shows the available parameter de-
scription elements:
Index
Description
1
Basic characteristics
2
No of elements (array types)
4
Unit of measure
6
Name
7
Lower limit
8
Upper limit
20
Default value
21
Additional characteristics
In the following example
Read Parameter Description
Elements
is chosen on parameter 001,
Language
, and
the requested element is index 1
Basic characteris-
tics
.
Basis characteristics (index 1):
The Basic characteristics command is split up in two
parts representing basic behaviour and datatype. The
Basic characteristics return a 16 bit value to the master
in PWE
LOW
.
The basic behaviour indicates whether eg. text is avail-
able or the parameter is an array as single bit infor-
mation in the high byte of PWE
LOW
.
The datatype part indicates if a parameter is signed 16,
unsigned 32 in the low byte of PWE
LOW
.
VLT
®
5000 Design Guide
MG.52.B2.02 - VLT
®
is a registered Danfoss trademark
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