Technology
EP7342-0002 integrates a compact Motion Control solution up to 200 W with minimum space requirement.
DC motor
DC motors can replace the considerably more expensive servo motors in many applications if they are operated with an intelligent controller. Since its speed is proportional to the voltage, the DC motor is easy to control in comparison with other motors.
Two output stages for optimum performance
With the EP7342-0002 EtherCAT Box a DC motor can easily be integrated into the control system. All parameters are adjustable via the fieldbus. The DC motor output stages for EtherCAT unite a small, compact design with an extensive area of application. Two DC motors can be operated directly with each of the output stages. The EP7342-0002 also has an integrated feedback system for incremental encoders.
The speed can be easily adjusted via the process data. The integrated compensation of the internal resistance keeps the motor at the desired speed for load changes. The speed is preset by a 16-bit value from the automation device. Thus a simple drive task can be solved using a simple controller.
The EtherCAT Box has two channels, whose signal states are indicated by LEDs. This enables fast local diagnosis.
Areas of application
Two areas of application are particularly well supported by the output stages:
- A simple controller with inexpensive processor power and low demands on the cycle time.
By using the integrated path control, the box can carry out independent positioning movements without the use of NC. Only a DC motor and the EtherCAT Box are required. - High-end positioning with integration in TwinCAT NC.
In conjunction with the EP7342-0002, a DC motor is controlled under TwinCAT like a servo terminal. No further changes are necessary.
For demanding positioning tasks a closed speed control loop with a feedback system is needed. The EtherCAT Box enables connection of an incremental encoder.
The control loop can be closed either by the EtherCAT Box itself or by the higher-level control system.
The peak current may briefly significantly exceed the nominal current and in this way makes the whole drive system very dynamic. In such dynamic applications, negative acceleration causes energy recovery, which lead to voltage peaks at the power supply unit.
The EP9576-1032 brake chopper box protects against the consequences of overvoltage by absorbing part of the energy. It has an integrated brake resistor that converts surplus energy into heat.