Waluyo, Waluyo and WIDURA, Andre and SURYADI, Yudithia Agustiawan (2019) Implementation of Curtain Blind Rolling Automation using PLC. Electrotehnică, Electronică, Automatică (EEA), 67 (4). pp. 35-40. ISSN 1582-5175 online ISSN: 2392-828X

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Abstract

Illuminance in a room comes not only from lighting lamps, but also from natural daylighting. However, if it is excessive, it may cause a glare. Thus, it is necessary to optimize the day lighting automatically. This paper presents the design and testing results of vertical curtain automation utilizing PLC TM221 and ladder diagram software. The program performed an analogue logic operation. The 4-20 mA current analogue signal of light sensor transmitter output was converted to 2-10 V using 50 Ω resistor, in the provision of the PLC analogue input, in recording of 0- 2000 lux. In the design of ladder diagram, the sensor, as the PLC input, was the reference value for the programming of SoMachine software. It was necessary to adjust the upper and the lower limits of the curtain on the limit switch, connected to the curtain motor. Hereafter, it was conducted the tests of lux values. The initial step, in the automatic open and close curtain program making, was to determine the visual comfort specified reference value of 230 lux in the classroom. As the reading sensor under or same as 350 lux, the curtain would go up. Otherwise, it would go down. As the curtain rose, it would continue to rise up to 230 lux, it would remain motionless, and it would be locked on the sensor reading between 220 lux and 238 lux. Otherwise, it would continue to go up to 230 lux, to the upper limit set by the limit switch. As the sensor reading of 239 lux and above, it would turn off as the sensor reading under or same as 350 lux. Otherwise, the curtain would go down, and it would read whether the sensor reading under or same as 201 lux. As the curtain went down, it would continue up to 230 lux, it would be quiescent, and it would be locked on the sensor reading between 220 and 238 lux. Otherwise, the curtain would go down continuously to get 230 lux, up to the lower limit set. As the sensor read same as or under 201 lux, it would turn off the 350 lux (or less) sensor reading and the curtain would go down to the lower limit. The obtained results of the design, the curtain could open and close automatically. The automatic motion of the curtain was based on the illuminance in the room. The opening of the curtain was to keep the illuminance of 230 lux in the room and it would be held to the value between 220 lux and 238 lux. The locked curtain was done so that it was not too sensitive to any change in the sensor signal. Keywords: curtain, daylighting, illuminance, ladder diagram, PLC

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