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The objective of this study is to build a low voltage three phase 24/41-volt programmable logic controller (PLC) lab. experiment training set for vocational education institution with limited budged. The training set is very cheap, durable and save from electric shock hazard due to no other and no higher voltage used for running it. The 12 I-O PLC unit using ATMEGA 16 processor, programmed by LD micro ladder diagram software on the laptop connected to the PLC module. The loads are: two units three phase motor modified from washing machine motor with specific designed, three phase electronic magnetic contactor, three modified motorcycle bulb lamp and one buzzer. The training set equipped with two version protection; electronic phase failure for the three phase source and electronic fuse destroyer in every unit module. The 24/41 volt three phase source will be blackout one second after one of the 8 ampere three phase fuse become off by overload condition or destroy due to a wrong connection of the individual module from phase to neutral (24 volt) become phase to phase(41volt). The evaluation result from the three internal department of PLC programmer expert and five vocational secondary school (SMK) teachers in Yogyakarta shows that the unit works well as it intended.

Home-made PLC laboratory training set for limited budget vocational education institution