Dc Motor Speed Control

Model No. DL 2125

This system must be suitable for the study of programmable logic control techniques in the control of the speed of a separately excited dc motor.
The speed regulation shall include two control loops: hardware current loop with over-current limiting and speed loop with external PLC control.
Speed measuring with a tachogenerator or with an opto-encoder via frequency/voltage converter.
Speed reference set by means of potentiometer or selector switches and under PLC control.
The PI controller shall modulate the PWM circuit that drives the power stage consisting of switching transistor.
Possibility of acceleration and deceleration ramps programming.
Pointer meters for motor speed, voltage and armature current; The system supplied with a machine set consisting of a dc permanent magnet motor, a dc tachogenerator, an encoder and a manual brake.
-Power: 48 Vdc, 5 A.
-Tachometric signal: 180 V at 3000 rpm.
-Power supply: single-phase from mains.
-Complete with connecting cables, teacher’s manual and student’s work forms.

With this system, the student must be able to study the following:
-Open loop speed control
-Closed loop speed control
-Use of the PLC for the speed measuring
-Acceleration and deceleration ramps programming
-Duty cycle monitoring

With this trainer is possible to perform the following exercises:
-the automatic regulation
-the block diagram
-the industrial operations
-direct current electric motors
-permanent magnet motors
-operations for direct current motors speed transducers
-operation characteristics of the opto-encoder
-output characteristics of the tachometric dynamo
-the plc as tachometric indicator
-control with the speed set through the keyboard
-control with the speed adjusted through the potentiometer
-closed loop control with potentiometer and tachometric dynamo
-closed loop control with potentiometer and opto-encoder
-The system must be connectable to PLC through two connectors (37-pin type) placed on the backside of the panel.
-This system must be supplied with connecting cables, educational manual and PLC control software.
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