Danfoss VLT 8000 AQUA Instrukcje Operacyjne Pobierz pdf (Strona 7)

VLT

2800, VLT

6000 HVAC and VLT

8000 AQUA Modbus RTU

Overview

■VLT 2800, VLT 6000 and VLT 8000 with Modbus RTU

The frequency converter communicates in Modbus

RTU format over an EIA-485 (formerly RS-485)

network. Modbus RTU allows access to the frequency

converter’s Control Word and Bus Reference.

The Control Word allows the Modbus master to control

several important functions of the frequency converter:

• Start

• Stop the frequency converter in several ways:

Coast stop

Quick stop

DC Brake stop

Normal (ramp) stop

• Reset after a fault trip

• Run at a variety of preset speeds

• Runinreverse

• Change the active setup

• Control the frequency converter’s two built-in relays

The Bus Reference is commonly used for speed control.

It is also possible to access the parameters, read

their values, and, where possible, write values to

them. This permits a range of control possibilities,

including controlling the frequency converter’ssetpoint

when its internal PID controller is used.

MG.10.S2.02 - VLT is a registered Danfoss trademark

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Danfoss VLT 8000 AQUA Instrukcje Operacyjne Strona 7