Experimental Apparatus for the Study of Faults in Asynchronous Motors
A kit on wheels for the study of the faults that most often stop a three-phase squirrel-cage asynchronous motor with brake. It has two units, a diagnosis panel for the student and a control
panel for the teacher, plus the motor and its braking system. The teacher sets a fault. The student finds it by measurement and safety testing.
Description
The ET521 puts a squirrel-cage asynchronous motor, a brake and two panel units on one frame with wheels. From the lockable control panel the teacher switches faults into the motor
windings and into the brake circuit without tools, and the student cannot see which one is active. The student starts the motor from the diagnosis panel, which brings out every
measurement point, and locates the fault by voltage, current, continuity and insulation measurements. The apparatus plugs into the 400 V three-phase mains with a Hypra plug on a
5 m cable. An isolating transformer and a 30 mA residual current device protect the student during every measurement.
Features
kit on wheels with two units, a squirrel-cage asynchronous motor and a braking system
diagnosis panel for the student, lockable control panel for the teacher
simulation of the most frequent faults: damaged winding, open winding, short circuit, winding shorted to earth
fault on the brake circuit
faults set by the teacher without tools and hidden from the student
diagnosis by measurements and safety tests
measurements possible in dusty conditions
Specifications
Power supply400 V, 3 phases, 50 Hz
Mains connectionthree-phase Hypra plug on a 5 m mains cable
Motorthree-phase squirrel-cage asynchronous motor with brake
Units2, student diagnosis panel and teacher control panel
Fault typesdamaged winding, open winding, short circuit between windings, winding to earth, brake supply interrupted
Protectionisolating transformer, residual current device 30 mA
Frame with wheels650 × 700 × 1150 mm
Weight135 kg
400V
135kg
Learning objectives / experiments
structure and connection of a three-phase asynchronous motor with brake
simulation of the common faults of an induction motor with brake
damaged winding
open winding
short circuit
winding shorted to earth
a fault-finding method that goes from the symptom to a measurement and then to the faulty component
measurement of winding resistance, continuity and insulation resistance
safety tests before a motor is energised
diagnosis of a fault on the brake circuit
Scope of delivery
1 frame with wheels
1 student diagnosis unit
1 teacher control unit
1 three-phase squirrel-cage asynchronous motor with braking system
1 mains cable, 5 m, with three-phase Hypra plug
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.
