Data Types Supported; Conversion; Process Words (Pcd) - Danfoss VLT AQUA Drive FC 202 Design Manual

RS-485 Installation and Set...
block. Serial communication is only capable of reading
parameters containing data type 9 (text string).
15-40 FC Type to 15-53 Power Card Serial Number contain
data type 9.
For example, read the unit size and mains voltage range in
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
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 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."
PKE
Read text Fx xx
Write text Fx xx
Illustration 7.11 PWE

7.4.11 Data Types Supported

Unsigned means that there is no operational sign in the
telegram.
Data types
3
4
5
6
7
9
10
13
33
35
Table 7.6 Data Types Supported
MG20Z202
Design Guide
IND PWE PWE
high low
04 00
05 00
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
Byte string
Time difference
Reserved
Bit sequence
Danfoss A/S © Rev. 06/2014 All rights reserved.

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.
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:
0 s⇒conversion index 0
0.00 s⇒conversion index -2
0 ms⇒conversion index -3
0.00 ms⇒conversion index -5
Conversion index
100
75
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Table 7.7 Conversion Table

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⇒follower Control
word)
Control Telegram (follower⇒master) Status
word
Table 7.8 PCD Sequence
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
153
7 7