Danfoss VT2800 Series User Manual

VLT
®
2800 Series
Example - Write a parameter value:
Parameter 202 Output frequency high limit, f
MAX
to
be changed to 100 Hz. The value must be rec alled
after a mains failure, so it is written in EEPROM.
PKE = E0CA Hex - Write for parameter 202
Output frequency high limit, f
MAX
IND = 0000 Hex
PWE
HIGH
= 0000 Hex
PWE
LOW
= 03E8 Hex - Data value 1000,
corresponding to 100 H z, see conversion.
Theresponsefromtheslavetothemasterwillbe:
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 Process units
IND = 0000 Hex
PWE
HIGH
= 0000 Hex
PWE
LOW
= 0014 Hex - Select data option
kg/hour [20]
Theresponsefromtheslavetothemasterwillbe:
Example - Reading a parameter value:
The value in parameter 207 Ramp up time 1 is required.
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:
Conver sion:
Under the section ent itled Factory Settings the
various attributes of each parameter are displayed.
As a parameter value can only be transferred
as a whole numbe r, a con version factor must
be used to transfer decimals.
E
xample:
Parameter 201 Output frequency, low limit f
MIN
has
a conve rsion factor of 0.1. If you wish to preset the
minimum frequency to 10 Hz, the value 100 must
be transferred, as a conversion fa ctor of 0.1 means
that the value transferred is multi plied by 0.1. The
value 100 will thus be perceived as 10.0.
Conversion table
Conversion
index
Conversion
factor
73 0.1
2 100
110
01
-1 0.1
-2 0.01
-3 0. 00 1
-4 0.0001
-5 0.00001
■ Process Words
The block of process words is divided into two blocks
of 16 bits, which always oc cur in the defined sequence.
PCD 1 PCD 2
Contr
ol telegram
(master⇒slave)
Contr
ol word
Refer
ence-
value
Control telegram
(slave⇒master)
Status word Present outp.
frequency
MG.28.E9.02 - VLT is a registered Danfoss trademark
112

Danfoss VT2800 Series Specifications

General

Brand	Danfoss
Model	VT2800 Series
Category	Controller
Language	English