Danfoss Metasys N2 Design Guide

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 dierent lengths. The telegram length is dened in
the 2
nd
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
eldbus. To write a text via the PWE block, set the
parameter command (AK) to F hex. The index characters
high-byte must be 5.
PWE
high
PWE
low
Read text
Write text
130BA275.10
PKE IND
Fx xx 04 00
Fx xx 05 00
Illustration 14.11 PWE
14.5.11 Data Types Supported
Unsigned means that there is no operational sign in the
telegram.
Data types Description
3 Integer 16
4 Integer 32
5 Unsigned 8
6 Unsigned 16
7 Unsigned 32
9 Text string
10 Byte string
13 Time dierence
33 Reserved
35 Bit sequence
Table 14.7 Data Types Supported
14.5.12 Conversion
The various attributes of each parameter are shown in the
section factory settings. Parameter values are transferred as
whole numbers only. Conversion factors are therefore 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.
Examples:
0 s⇒conversion index 0
0.00 s⇒conversion index -2
0 M/S⇒conversion index -3
0.00 M/S⇒conversion index -5
Conversion index Conversion factor
100
75
74
67
6 1000000
5 100000
4 10000
3 1000
2 100
1 10
0 1
-1 0.1
-2 0.01
-3 0.001
-4 0.0001
-5 0.00001
-6 0.000001
-7 0.0000001
Table 14.8 Conversion Table
14.5.13 Process Words (PCD)
The block of process words is divided into 2 blocks of 16
bits, which always occur in the dened sequence.
PCD 1 PCD 2
Control telegram (master⇒slave control word)
Reference-value
Control telegram (slave⇒master) status word
Present output
frequency
Table 14.9 PCD Sequence
14.6
RS485: FC Protocol Parameter
Examples
14.6.1 Writing a Parameter Value
Change parameter 4-14 Motor Speed High Limit [Hz] to 100
Hz.
Write the data in EEPROM.
Appendix Design Guide
MG16C302 Danfoss A/S © 11/2017 All rights reserved. 231
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Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English