Logical Command And Speed Reference; Selection For Logical Command And Speed Reference - WEG CFW501 V1.8X Programming Manual

Logical Command and Speed Reference

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, 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 CFW501 in 16 bits with signal (-32768 to +32767) for
a range from -18000 rpm to 18000 rpm and, therefore, minimum resolution of 0.55 rpm. 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: General block
7
diagram for commands and references on page 7-2.
Parameter P0220 determines the source of commands between the 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: Command
st nd
selection structure 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, respectively. This
structure for the selection of the reference source is shown in Figure 7.3: Structure to select the speed reference on
page 7-4, where parameter P0312 directs the serial communication source to the plug-in modules with two ports.
CFW501 | 7-1