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ET531 · Starting of Asynchronous Motors

Experimental Apparatus for the Study of Asynchronous Motor Starting

A self-contained apparatus for the study of the starting methods of a three-phase asynchronous motor. The motor, a powder brake and a tachogenerator sit on a base with wheels next to the electrical cabinet. The student selects the type of start with push-buttons and lamps on the cabinet, and a multifunction measuring unit and a digital speed display show what each method does to the currents, the powers and the run-up of the motor.
Description
    The ET531 is an electrical cabinet and its motor group on a frame with wheels, supplied from the 400 V three-phase mains. A set of lamps and push-buttons selects and controls the type of start. A multifunction measuring unit with digital display, wired at the start of the circuit, measures the voltages, the line currents, the total active, reactive and apparent power, the power factor and the total harmonic distortion. A second digital display shows the rotational speed of the motor. Potentiometers on the front of the cabinet set the starter's acceleration time, deceleration time and torque, and two more set the speed and the load of the motor. A contactor and circuit breaker wired upstream of the motor protects it against overload and short circuit, and its built-in display shows the motor current and the thermal protection threshold.
Features
  • set of lamps and push-buttons for viewing and controlling the type of start
  • multifunction measuring unit for voltages, line currents, active, reactive and apparent power, power factor and THD
  • digital display of the motor speed
  • starter acceleration time, deceleration time and torque set on front potentiometers
  • motor speed and motor load set on front potentiometers
  • overload and short-circuit protection with display of motor current and thermal threshold
  • measurements possible in dusty conditions
Specifications
    Power supply 400 V, 3 phases, 50 Hz
    Torque adjustment 20…65 %
    Acceleration time 1.1…5 s
    Deceleration time 0…5 s
    Motor asynchronous, 300 W, 1500 rpm, 400 V / 690 V, 1 / 0.75 A
    Brake powder brake, 300 W, control 0…10 V
    Tachogenerator 20 V at 1000 rpm
    Measuring unit U, I, P, Q, S, power factor, THD
    Frame with wheels 800 × 700 mm, total height 2000 mm
    Weight 115 kg
400V
L 800 W 700 H 2000 mm
115 kg
Learning objectives / experiments
  • starting methods of a three-phase asynchronous motor
    • direct-on-line starting
    • star-delta starting
    • electronic starter with adjustable acceleration ramp, deceleration ramp and torque
  • measurement of the starting current and of the line currents for each method
  • active, reactive and apparent power, power factor and harmonic distortion during starting and running
  • run-up of the motor speed under different loads
  • protection of the motor against overload and short circuit
Scope of delivery
  • 1 electrical cabinet with starting circuits, push-buttons and lamps
  • 1 multifunction measuring unit with digital display
  • 1 digital speed display
  • 1 asynchronous motor 300 W, 1500 rpm
  • 1 powder brake 300 W
  • 1 tachogenerator
  • 1 frame with wheels
  • 1 set of safety measuring leads
  • 1 set of instructional material

All components and accessories listed under Scope of delivery are supplied, whether or not they are visible in the illustrations.

Required for operation
  • 400 V, 50 Hz, 3 phases