← All fault simulators
Industrial · Fault simulator

Conveyor motor trips on overload

REVIEW COPY. Every reading and explanation is a placeholder until Jordan checks it. The reviewer table at the bottom lists them all for each fault.
Customer report
The conveyor runs for a few minutes then trips on overload. We reset it and it does the same again. It's been getting worse this week.
Circuit
7.5 kW, 400 V, 3-phase motor, delta connected, nameplate full-load current 14.8 A. DOL starter: isolator, fuses, contactor K1 and thermal overload, then the motor driving the conveyor gearbox through a flexible coupling.
Your job
Find the fault with the fewest tests, working safely. The fault is different each time. Every test costs 2 points, unsafe steps cost more.
Coupled and uncoupled
Coupled means the coupling between the motor shaft and the gearbox is in place, so the motor is driving the conveyor as normal. Uncoupled means the coupling has been split, so the motor spins on its own with no load. Comparing the two tells you whether the problem is the motor or what it's driving. Uncoupling is mechanical work, so it's done isolated, locked and tagged, usually with the fitter, and the loose shaft key is removed or secured before the motor is run again.

Circuit

L1L2L3 IsolatorFusesK1Overload M3~7.5 kW 14.8 A

Safety actions

Live tests are done energised with insulated probes and the right PPE. Dead tests need the circuit isolated, locked, tagged and proved dead.

Choose a test

Meter · ready

Score

100

    Call the fault

    Reviewer table

    Pick a fault to see every reading the simulator shows for it. Chapter reference: [Jordan to add Bible chapter]

    TestConditionReadingWhat it tells you