Danfoss VLT 5000 Manuel - Sayfa 6

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Process and PCD data

The process data is spilt up in two parts, a fixed 2

words data part for controlling the VLT frequency

converter and a flexible part, called PCD, that

can consist of 7 words.

Fixed

User definable

Fixed

User definable

MRV PCD1 PCD2

CTW

PCD3

Fixed

User definable

MAV PCD1 PCD2

STW

PCD3

For controlling the VLT 5000 you can select

between the FC profile or Drivecom profile (VLT

parameter 512).

Please have a look at the Interbus operating

instructions for further description of each profile.

PCD data is very useful if you need a constant

update of process parametersvariables, for

example motor current or torque.

Programming example

The following example will show how to set up

process and PCD data.

The chosen profile is Drivecom profile and as PCD

data we will readout parameter 520 Motor current

and 518 Motor frequency. We will also write to

parameter 207 Ramp up time 1 as PCD data.

The data for the VLT frequency converter in our PLC

program starts at address 20. So we have to map

address 20 to the Interbus card in the VLT

frequency converter. This is done with the CMD

tool.

PLC

QW 20

CTW

FC profile

QW 22

MRV

0-100%

QW 24

PCD1

Par. 207

IW 20

STW

FC profile

IW 22

MAV

0-100%

IW 24

PCD1

Par. 520

IW 26

PCD2

Par. 518

First we have to setup the VLT frequency converter

to run with two PCD's. This is done in the

respective parameter 807 PCD size select and

parameter 915/916 PCD config. write/read.

PCD4

PCD5 PCD6

PCD7

PCD4

PCD5 PCD6

PCD7

Interbus

CTW

MRV

PCD1

STW

MAV

PCD1

PCD2

VLT

5000 and Interbus CMD

PCD 1 has to be set to read the motor current via

parameter 520. This is done by setting sub index 1

in parameter 916 PCD configuration read to 520.

PCD 2 has to be set to read parameter 518 Motor

frequency. Set sub index 2 to 518.

FREQUENCY

0.0 Hz

916 PCD CONFIG. READ

[1]

520

FREQUENCY

0.0 Hz

916 PCD CONFIG. READ

[2]

518

PCD 1 has to be set to write the ramp up time 1 via

parameter 207. This is done by setting sub index 1

in parameter 915 PCD Configuration write to 207.

FREQUENCY

0.0 Hz

915 PCD CONFIG. WRITE

[1]

207

In parameter 807 PCD size select you have to

assign the number of PCD's which the VLT

frequency converter is using.

Choose 2 WORDS [2] and power down the VLT

frequency converter. At next power up the PCD's

will be active.

FREQUENCY

0.0 Hz

807 PCD SIZE SELECT

2 WORDS

MN.50.U1.02 - VLT is a registered Danfoss trademark

SETUP