The scenario
A sliding gate uses a 400 V three-phase motor. Reversing contactors KM1/KM2 are interlocked to prevent simultaneous forward and reverse, while a 24 V control circuit with safety edge stops operation if the edge is pressed.
What is in this drawing
Read the decisions behind it.
01
Use reversing contactors with electrical interlock to swap L1 and L3 for motor reversal.
02
Derive 24 V control voltage from a transformer to isolate pushbuttons and safety edge from the 400 V supply.
03
Place safety edge and STOP pushbuttons in series with both direction commands.
When designing or reviewing an electric gate panel with a three-phase motor, reversing contactors, and safety edge interlocking.
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