Unit 12 Relay Trainer

Patch the 120 V power circuit and the 24 V control circuit, then run it.

Cord
Probe: hover a jack to read its voltage.

Drag from one jack to another to patch a cord, or click one jack and then another. Cords stack like banana plugs. Double-click a cord to remove it (or click it and press Delete). Hold a pushbutton to press it; shift-click locks it in. With the main switch off, click and hold a relay to push its armature in by hand.

Sequence of operation

    Ladder diagram

    Green dotted: N.O. now closed · Red dotted: N.C. now open · amber: latest cord · red circle: open end

    About this circuit

    Try this

    Diagram reading

    Get a random ladder diagram with a 24 V control circuit (pushbuttons, relay contacts, coils) and a 120 V power circuit (relay contacts and lamps). Wire it on the board, then check it. The check runs the pushbuttons through every press-and-release sequence and compares your board with the diagram.

    Supply

    Relay coils pick up at 85 % of 24 V (20.4 V) and drop out below 55 % (13.2 V).

    Wiring list

      Readings

      Event log

        Instructor settings

        Pushbutton action