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 95
Serial communication
To Next Page
Loading...
Need help?
General