Danfoss VLT FC 102 Operating Instructions Manual page 156

7 RS-485 Installation and Set-up
If the command cannot be performed, the slave sends this response:
0111 Command cannot be performed
- and issues the following fault report in the parameter value (PWE):
PWE low (Hex)
0
1
2
3
4
5
11
82
83
7.4.8 Parameter Number (PNU)
7
Bits no. 0-11 transfer parameter numbers. The function of the relevant parameter is defined in the parameter description in the Programming Guide.
7.4.9 Index (IND)
The index is used together with the parameter number to read/write-access parameters with an index, e.g. par. 15-30
consists of 2 bytes, a low byte and a high byte.
Only the low byte is used as an index.
7.4.10 Parameter Value (PWE)
The parameter value block consists of 2 words (4 bytes), and the value depends on the defined command (AK). The master prompts for a parameter
value when the PWE block contains no value. To change a parameter value (write), write the new value in the PWE block and send from the master to
the slave.
When a 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. par. 0-01
to Danish, select the data value by entering the value in the PWE block. See Example - Selecting a data value. Serial communication is only capable of
reading parameters containing data type 9 (text string).
FC Type to par. 15-53 Power Card Serial Number contain data type 9.
Par. 15-40
For example, read the unit size and mains voltage range in par. 15-40
variable, and the texts are of different lengths. The telegram length is defined in the second byte of the telegram, LGE. When using text transfer the
index character indicates whether it is a read or a write command.
To read a text via the PWE block, set the parameter command (AK) to 'F' Hex. The index character high-byte must be "4".
Some parameters contain text that can be written to via the serial bus. To write a text via the PWE block, set the parameter command (AK) to 'F' Hex.
The index characters high-byte must be "5".
156
Fault Report
The parameter number used does not exit
There is no write access to the defined parameter
Data value exceeds the parameter's limits
The sub index used does not exit
The parameter is not the array type
The data type does not match the defined parameter
Data change in the defined parameter is not possible in the frequency converter's present mode. Certain parameters
can only be changed when the motor is turned off
There is no bus access to the defined parameter
Data change is not possible because factory setup is selected
MG.16.A1.02 - VLT
VLT HVAC Low Harmonic Drive Operating In-
Language where [0] corresponds to English, and [4] corresponds
FC Type . When a text string is transferred (read), the length of the telegram is
®
is a registered Danfoss trademark
structions
Alarm Log: Error Code . The index