Examples - Danfoss VLT HVAC Drive FC 100 Series Design Manual

7. RS-485 Installation and Set-up
7.4.11. Data Types Supported by the Frequency Converter
Data types
3
4
5
6
7
9
7
10
13
33
35
7.4.12. Conversion
The various attributes of each parameter are displayed in the section
Factory Settings. Parameter values are transferred as whole numbers
only. Conversion factors are therefore used to transfer decimals.
Motor Speed, Low Limit
Par. 4-12
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.
7.4.13. Process Words (PCD)
The block of process words is divided into two blocks of 16 bits, which always occur in the defined sequence.
PCD 1
Control telegram (master⇒slave Control word)
Control telegram (slave ⇒master) Status word

7.5. Examples

7.5.1. Writing a parameter value
Motor Speed High Limit [Hz]
Change par. 4-14
134
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
Byte string
Time difference
Reserved
Bit sequence
has a conversion factor of 0.1.
to 100 Hz.
MG.11.B7.02 - VLT
Unsigned means that there is no operational sign in the telegram.
Conversion table
Conversion index
74
2
1
0
-1
-2
-3
-4
-5
PCD 2
Reference-value
Present outp. frequency
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VLT HVAC Drive Design Guide
Conversion factor
0.1
100
10
1
0.1
0.01
0.001
0.0001
0.00001