Its function is to transform the line voltage to the relay logic voltage and handle the contactor coil inrush current. Contactors with AC coils draw about 5 times rated current until the magnetic ...

We can understand why the final design used a microcontroller, but we also think that [Alex’s] relay logic circuit is an eloquent way of doing things. He uses limiting switches as the feedback ...

Relay and solenoid driver circuit doubles supply voltage to conserve sustaining power when driving the device into an actuation state. ... But what happens if even doubling the V L logic rail still ...

Ladder logic is the basis of most control functions Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past ... at right). Logic gates use digital electronics to ...

A close second is “relay logic”. ... When the prototype stage was complete, the circuit was recreated on a new board that mounts all 55 Omron relays on the same PCB.

The problem begins when we independently switch off the digital-circuitry power supply before the relay-coil supply. In the circuit of Figure 1, the CPLD has to output a logic “1” (+5 V) to ...

The PuffinPLC Project is an effort to produce a Linux-based GNU Public Licensed Programmable Logic Controller (PLC). PLCs were developed in the 1960s to replace the complex electrical relay circuits ...

This power-conditioning circuit for an automotive electronic control unit replaces bulky transient absorbers with an electronic switch, Q1, and an electromechanical relay with an RC timer circuit ...