Programmable Logic Controller for Hydro Pneumatic Press Control

Abstract

Hydro pneumatic presses are a better choice over hydraulic and conventional mechanical presses. These presses are built to match up to the demands of applications like automotive parts assembly, piercing, embossing, insertion, bending, drawing, etc. The control and the operation of the system is based on a programmable logic unit and a system of sensors. The PLC gets inputs from the sensors in the system. The home limit switch signal defines the ‘cycle on’ from PLC. The primary parameters measured by the PLC are speed and pressure generated. The signal from the changeover limit switch indicates the transition of the ram from high speed to high pressure generated for the pressing action. A counter is used in the PLC for counting the number of cycles.

Keywords- Hydro pneumatic, PLC, DVP, SMPS.