Reference Source Selection; Command And References - WEG CFW100 Programming Manual

COMMAND AND REFERENCES

7 COMMAND AND REFERENCES
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/DeviceNet interface, SoftPLC, etc.
The command via HMI is limited to a set of functions pre-defined for the keys according to Chapter 5 HMI on page
5-1, similarly to the digital inputs (DIx), with the functions implemented in parameter P263 to P266. 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 frequency reference, in turn, is processed inside the frequency inverter in 16 bits with signal (-32768 to +32767)
for a range of -400.0 Hz to +400.0 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 7-6.

7.1 REFERENCE SOURCE SELECTION

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 P220 determines the source of commands for Local and Remote situations.
Parameters P223, P224 and P225 define the commands in the Local situation; parameters P226, P227 and P228
define the commands in the Remote situation, and parameter P105 determines the source for selection between
st nd
1 and 2 Ramp. This structure for the selection of the command source is shown in Figure 7.1 on page 7-2.
Parameters P221 and P222 define the frequency reference in the Local and Remote situations. This structure for
the selection of the reference source is shown in Figure 7.2 on page 7-3.
7
Micro Mini Drives | 7-1