Machines Simulation Lab/ AC Driver
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Date: Experiment-2
Variable speed drives for asynchronous motor
(AC Driver)
Aim: To enable students to develop competence in operating and
troubleshooting a control system that includes industrial drive and to show
the running and operation response of 3-phase squirrel cage induction motor
with different conditions.
Introduction: The Schneider AC variable speed drive ATV12 - 2.2kW- 240V -
3hp, uses the latest solid-state PWM technology to control a 3-phase squirrel
cage induction motor (IM). A keypad and an LCD screen allow modification
and visualization of many different parameters, such as min/max speed,
acceleration/deceleration time, torque, etc. The following Figure (1) has
shown the driver and Wiring Diagram.
Figure (1)
The V/Hz output characteristic is user-selectable for constant torque, pump,
or fan applications. The preset of speeds and rotate direction may be
Machines Simulation Lab/ AC Driver
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programmed. Speed can be controlled using either the digital keypad or the
analog input on the front panel of the module.
Procedure:
1- Connect the power, IM and control circuit as shown in Figure (2).
2- Run the motor form the pad and remote control with different directions.
3- Run the motor form Nr=0 rpm to Nr= 1500 rpm, in steps of 100 rpm.
Write all values of frequency, current and supply voltage.
Figure (2)
Report:
1- What are the benefits of the analog and digitals signals of AC Driver?
2- How can you use PLC to control AC driver?
3- Outlines (in clearly and briefly) all speed control methods for the three
phase induction motor with drawing the torque speed characteristic for
each one.