VLT
®
FCM Series
Bit no.
15
14
13
12 Command
0
0
0
0
No command
0
0
0
1
Read parameter value
0
0
1
0
Write parameter value in
RAM (word)
0
0
1
1
Write parameter value in
RAM (double word)
1
1
0
1
Write parameter value in
RAM and EEPROM (double
word)
1
1
1
0
Write parameter value in
RAM and EEPROM (word)
1
1
1
1
Read text
Reply slave
→
master:
Bit no.
15
14
13
12 Reply
0
0
0
0
No reply
0
0
0
1
Parameter value transferred
(word)
0
0
1
0
Parameter value transferred
(double word)
0
1
1
1
Command cannot be
executed
1
1
1
1
Text transferred
If the command cannot be executed, the slave
will send this reply (0111) and give the following
error message in the parameter value:
Error code
(reply 0111) Error message
0
The parameter number used does not
exist
1
There is no write access to the
parameter called
2
The data value exceeds the parameter
limits
3
The used sub-index does not exist
4
The parameter is not of the array type
5
The data type does not match the
parameter called
17
Data change in the parameter called
is not possible in the present mode of
the FC motor. E.g. some parameters
can only be changed when the motor
has stopped
130
There is no bus access to the
parameter called
131
Data change is not possible because
factory Setup has been selected
Parameter number (PNU)
Bits no. 0-10 are used for transmitting parameter
numbers. The function of a given parameter can be
seen from the parameter description in chapter 8.
Index
Index is used together with the parameter number
for read/write access to parameters of the
array
type (par. 615, 616 and 617).
Parameter value (PWE)
The parameter value depends on the command
given. If the master wants a parameter (read), it does
not care about the PWE block value. If a parameter
is changed by the master (write), the new value is
transferred in the PWE block. If the slave replies to
a parameter request (read command), the present
parameter value is transferred to the PWE block.
The transferred value corresponds to the figures
given in the parameter descriptions in chapter 8. E.g.
parameter 101, where [1] corresponds to
Constant
torque
, [2] corresponds to
Variable torque: low
, etc.
However, parameters with data type 9 (text string) are
excepted, as this text is transferred as an ASCII text
string. 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, see page 73. Parameters
621-634 (nameplate data) have data type 9 (text string).
Data types supported by the VLT frequency converter
Data type
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.
The different attributes for each parameter can be
seen in the section on factory settings. Since a
parameter value can only be transferred as an integer,
a conversion factor must be used to transfer decimals.
MG.03.H3.02 - VLT is a registered Danfoss trademark
80