Danfoss VLT Flow Drive FC 111 Design Manual page 109

VLT® Flow Drive FC 111
Design Guide
When a follower 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 several data options, for example parameter 0-01 Language, select the data value by
entering the value in the PWE block. Serial communication is only capable of reading parameters containing data type 9 (text
string).
Parameter 15-40 FC Type to parameter 15-53 Power Card Serial Number contain data type 9. For example, read the unit size and mains
voltage range in parameter 15-40 FC Type. When a text string is transferred (read), the length of the telegram is variable, and the
texts are of different lengths. The telegram length is defined in the 2
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.
8.4.11 Data Types Supported by the Drive
Table 56: Data Types
Data types
3
4
5
6
7
9
10
13
33
35
Unsigned means that there is no operational sign in the telegram.
1
8.4.12 Conversion
The Programming Guide contains the descriptions of attributes of each parameter. Parameter values are transferred as whole num-
bers only. Conversion factors are used to transfer decimals.
Parameter 4-12 Motor Speed Low Limit [Hz] has a conversion factor of 0.1. To preset the minimum frequency to 10 Hz, transfer the
value 100. A conversion factor of 0.1 means that the value transferred is multiplied by 0.1. The value 100 is thus perceived as 10.0.
Table 57: Conversion
Conversion index
74
2
1
0
-1
-2
-3
-4
Danfoss A/S © 2021.04
nd
byte of the telegram (LGE). When using text transfer, the
Description
Integer 16
Integer 32
Unsigned 8
(1)
Unsigned 16
(1)
Unsigned 32
(1)
Text string
Byte string
Time difference
Reserved
Bit sequence
Conversion factor
3600
100
10
1
0.1
0.01
0.001
0.0001
RS485 Installation and Set-up
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