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Logical Command and Speed Reference

MW500 | 7-1

7 LOGICAL COMMAND AND SPEED REFERENCE

The drive of the electric motor connected to the inverter depends on the logical command and on the reference

defined by one of the several possible sources, such as: HMI keys, digital inputs (DIx), analog inputs (AIx), Serial/

USB interface, CANopen interface, DeviceNet interface, SoftPLC, etc.

The command via HMI is limited to a set of functions pre-defined for the keys according to chapter 4 HMI AND

BASIC PROGRAMMING on page 4-1, similarly to the digital inputs (DIx), with the functions implemented in

parameter P0263 to P0270. On the other hand, the command via digital interfaces, such as communication network

and SoftPLC, act directly on the inverter control word by means of control parameters and system markers of the

SoftPLC, respectively.

The speed reference, in turn, is processed inside the MW500 in 16 bits with signal (-32768 to +32767) for a range

of -500.0 Hz to +500.0 Hz. On the other hand, the unit factor, range and resolution of the reference depend on

the used source, as described in section 7.2 SPEED REFERENCE on page 7-7.

7.1 SELECTION FOR LOGICAL COMMAND AND SPEED REFERENCE

The inverter command and reference source is defined by the inverter parameters for two different situations: Local

and Remote, which can be switched dynamically during the inverter operation. Thus, for a certain parameterization,

the inverter has two sets for command and reference, according to block diagram of Figure 7.1 on page 7-2.

Parameter P0220 determines the command source for Local and Remote situations.

Parameters P0223, P0224 and P0225 define the commands in the Local situation; parameters P0226, P0227 and

P0228 define the commands in the Remote situation, and parameter P0105 determines the source for selection

between 1

and 2

Ramp. This structure for the selection of the command source is shown in Figure 7.2 on page

7-3, where parameter P0312 directs the serial communication source for the plug-in modules with two ports.

Parameters P0221 and P0222 define the speed reference in the Local and Remote situations. This structure for

the selection of the reference source is shown in Figure 7.3 on page 7-4, where parameter P0312 directs the

serial communication source to the plug-in modules with two ports.

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WEG MW500 Bedienungsanleitung Seite 61