Data Types Supported By The Frequency Converter; Conversion; Process Words (Pcd); Examples - Danfoss VLT AQUA Drive FC 200 Operating Instructions Manual

RS-485 Installation and Set...
7.3.11 Data Types Supported by the
Frequency Converter
Unsigned means that there is no operational sign in the
telegram.
Data types
3
4
5
6
7
9
10
13
33
35
7 7

7.3.12 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.
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.

Examples:

0s⇒conversion index 0
0.00s⇒conversion index -2
0ms⇒ conversion index -3
0.00ms⇒conversion index -5
144
VLT AQUA Low Harmonic Drive Operating Instructions
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
Byte string
Time difference
Reserved
Bit sequence
®
MG20T202 - VLT is a registered Danfoss trademark
Conversion index
100
75
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Table 7.1 Conversion Table

7.3.13 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
7.4 Examples

7.4.1 Writing a Parameter Value

Change 4-14 Motor Speed High Limit [Hz] to 100 Hz.
Write the data in EEPROM.
PKE = E19E Hex - Write single word in 4-14 Motor Speed
High Limit [Hz]
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 03E8 Hex - Data value 1000, corresponding to
100 Hz, see 7.3.12 Conversion.
The telegram will look like this:
E19E H 0000 H 0000
PKE IND PWE
Conversion factor
1000000
100000
10000
1000
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
PCD 2
Reference-value
Present output
frequency
H 03E8 H
PWE
high low