VLT
®
FCD Series
Response
(0111)
Fault report
0 The parameter number used
does not exist
1 There is no write access to the
defined parameter
2 Data value exceeds
the parameter’s limits
3 The sub index used
does not exist
4 The parameter is not the array type
5 The data type does not match the
defined parameter
17 Data change in the defined para-
meter is not possible in the fre-
quency
converter’s present mode.
Certain parameters can only be
changed
when the motor is turned off
130 There is no bus access to the
defined parameter
131 Data change is not possible be-
cause
factory Setup is selected
Parameter number (PNU)
Bits no. 0-10 are used to transfer parameter num-
bers. The relevant parameter’s function is defined in
the parameter description in the section entitled Pro-
gramming.
I
ndex
Index is used together with the parameter number to
read/write-access parameters that have an index,
e.g. parameter 615 Error code. The index is made
up of 2 bytes, one lowbyte and one highbyte, but
only the lowbyte is used as an index.
E
xample - Index:
The first error code (index [1]) in parameter 615 Er-
ror code must be read.
PKE = 1267 Hex (read parameter 615 Error code.)
IND = 0001 Hex - Index no. 1.
The frequency converter will respond in the parame-
ter value block (PWE) with a fault code value from 1
- 99. See Summary of Warnings and Alarms to
identify the fault code.
Parameter value (PWE)
The parameter value block consists of 2 words (4
bytes), and the value depends on the defined com-
mand (AK). If the master prompts for a parameter
value, the PWE block does not contain a value.
If you wish the master to change a parameter value
(write), the new value is written in the PWE block
and sent to the slave.
If the slave responds to a parameter request (read
command), the present parameter value in the PWE
block is transferred and returned to the master.
If a parameter contains not a numerical value, but
several data options, e.g. parameter 001 Language
where [0] corresponds to English, and [3] corre-
sponds to Danish, the data value is selected by
entering the value in the PWE block. See Example -
Selecting a data value.
Via serial communication it is only possible to read
parameters that have data type 9 (text string). Pa-
rameter 621 - 635 Nameplate data is data type 9.
For example, in parameter 621 Unit type it is possi-
ble to read the unit size and mains voltage range.
When a text string is transferred (read) the length of
the telegram is variable, as the texts are of different
lengths. The telegram length is defined in the tele-
gram’s second byte, known as LGE.
To be able to read a text via the PWE block the pa-
rameter command (AK) must be set to ’F’ Hex.
The index character is used to indicate whether it is
a read or write command.
In a read command the index must have the follow-
ing format:
MG.04.A1.02 - VLT is a registered Danfoss trade mark
97
Programming
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