VLT
®
6000 HVAC
125
MG.60.B1.02 - VLT is a registered Danfoss trademark
Programming
Lowbyte
Highbyte
Example - Index:
The first error code (index [1]) in parameter 615
Error
code
must be read.
PKE = 1267 Hex (read parameter 615
Error code
).
IND = 0001 Hex - Index no. 1.
1267 H 0001 H
The VLT frequency converter will respond in the
parameter value (PWE) block by means of an error
code with a value from 1-99. See
List of warnings
and alarms
to identify the error code.
Parameter value (PWE)
The parameter value block consists of 2 words (4
bytes) and its value depends on the command given
(AK). If the master enquires about a parameter value,
the PWE block contains no value.
If a parameter value is to be changed by the master
(write), the new value is entered in the PWE block and
sent to the slave.
If the slave responds to a parameter requirement
(read command), the present parameter value is
transferred in the PWE block and returned to the
master.
If a parameter does not contain a numerical value, but
several data selection options, e.g. parameter 001
Language
, where [0] is
English
and [1] is
Danish
, the
data value is selected by writing the value in the PWE
block. See example on the following page.
Via the serial communication it is only possible to
read parameters with data type 9 (text string). In VLT
6000 HVAC, parameters 621-631
Nameplate data
have data type 9. For example, it is possible in
parameter 621 Unit type to read the unit size and
mains voltage range.
When a text string is transferred (read), the telegram
length is variable, since the texts have different
lengths. The telegram length is stated in the 2nd byte
of the telegram, called LGE.
In order to read a text via the PWE block, the
parameter command (AK) must be set to 'F' Hex.
The index character is used to indicate whether the
command in question is a read or write command.
For a read command, the index must have the
following format:
04 00 H
VLT 6000 HVAC has two parameters for which a text
can be written: parameters 533 and 534
Display text
,
see the description of these under the parameter
description. In order to write a text via the PWE block,
the parameter command (AK) must be set to 'F' Hex.
For a write command, the index must have the
following format:
05 00 H
Data types supported by the VLT frequency converter
Datatype
Description
3
Integer 16
4
Integer 32
5
Unsigned 8
6
Unsigned 16
7
Unsigned 32
9
Text string
Unsigned means there is no sign included in the
telegram.
Example - Write a parameter value:
PKE
IND
PWE
HIGH
PWE
LOW
PKE
IND
PWE
Lowbyte
Highbyte
IND
IND