Automatic Control System Design of the Threshing Station Model, Case Study in PT. Perkebunan Nusantara V-PKS Sei Galuh

Abstract

This paper presents a design for the automatic control system of the  threshing  station  model  using  PLC  Zelio  smart  relay. Threshing station is a station where a process of separation palm kernel from the bunch by way of slamming into a rotating drum. The  threshing  station  model  is  a  shape  which  resembles  of  the threshing  station  palm oil  mill  of  PT. Perkebunan Nusantara V- PKS Sei Galuh, it has been scaled 1:8. PLC (Programmable Logic Controller)  is  a  microprocessor  based  on  instrument  that  can  be programmed to control the machining process automatically. This system  design  has  2  inputs  and  3  outputs.  The  inputs  are  push button to  turn  on and turn off  of the  works system  and a  rotary encoder sensor to detect rotating screw conveyor. The outputs are 3  units  of  DC  motors.  The  programming  language  is  used  the ladder diagram by using the Software  Zelio Soft 2.  This system includes  design  of  ladder  diagram  program,  design  of  control system  on  auto  feeder and design of rotary  encoder sensor. The result  of  this  design  is  revealed  that  auto  feeder  runs automatically turn on for 60 seconds and turn off for 30 seconds, continuously.  The  sensor  works  with  voltage  is  4.4  Volt  at  the moment un-stunted and 0.1 Volt when the stunted.