Build the logic
Place switching devices, coils, contactors and sources. Wire them into working control circuits.
Relay logic simulator for the electrical trades
Build the circuit.
Prove the logic.
Wire motor-control circuits, energize them, take measurements and track down the fault. Runs in your browser on a phone or a computer.
Three-wire motor starterStandby: KM1 de-energized
Every connection has a consequence.
Run the circuit
Energize the diagram and observe how contacts, actuators and connected loads respond.
Find what failed
Use the built-in measurement and troubleshooting tools to investigate circuit behavior.
The motor won’t stay running. What failed?
Nine fault-finding challenges built around common control-circuit faults. Study the symptom, choose the fault, then read why it happens.
Motor will not stay running
The motor runs while S2 START is held, but stops as soon as START is released.
Will not stop
The motor starts normally, but pressing S1 STOP does not stop it. Only switching off Q1 or FU1 stops it.
Contactor in, motor still
Pressing S2 START: KM1 pulls in and seals, H1 RUN is lit, but the motor hums and does not turn. A few seconds later KM1 drops out and H3 TRIPPED lights.
See plans The simulator is free. Challenges come with Pro, and with Electrical Red Seal Prep.
Start with control.
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