Danfoss VLT FCD 311 Design Guide

VLT
®
FCD Series
Some frequency converters have parameters to
which a text may be written. To be able to write a
text via the PWE block the parameter command
(AK) must be set to ’F’ Hex.
For a write command the text must have the follow-
ing format:
Data types supported by frequency transformer:
Data types Description
3 Integer 16
4 Integer 32
5 Unsigned 8
6 Unsigned 16
7 Unsigned 32
9 Text string
Unsigned means that there is no operational sign in
the telegram.
Example - Write a parameter value :
Parameter 202 Output frequency high limit, f
MAX
to
be changed to 100 Hz. The value must be recalled
after a mains failure, so it is written in EEPROM.
PKE = E0CA Hex - Write for parameter 202 Out-
put frequency high limit, f
MAX
IND = 0000 Hex
PWE
HIGH
= 0000 Hex
PWE
LOW
= 03E8 Hex - Data value 1000, corre-
sponding to 100 Hz, see conversion.
The response from the slave to the master will be:
Example - Selection of a data value:
You wish to select kg/hour [20] in parameter 416
Process units. The value must be recalled after a
mains failure, so it is written in EEPROM.
PKE = E19F Hex - Write for parameter 416 Pro-
cess units
IND = 0000 Hex
PWE
HIGH
= 0000 Hex
PWE
LOW
= 0014 Hex - Select data option kg/
hour [20]
The response from the slave to the master will be:
Example - Reading a parameter value:
The value in parameter 207 Ramp up time 1 is re-
quired.
The master sends the following request:
PKE = 10CF Hex - read parameter 207 Ramp up
time 1
IND = 0000 Hex
PWE
HIGH
= 0000 Hex
PWE
LOW
= 0000 Hex
If the value in parameter 207 Ramp-up time 1 is 10
sec., the response from the slave to the master will
be:
MG.04.A1.02 - VLT is a registered Danfoss trade mark
98

Danfoss VLT FCD 311 Specifications

General

Brand	Danfoss
Model	VLT FCD 311
Category	DC Drives
Language	English