Rancang Bangun Rangkaian Kontrol Bar Screen untuk Pembersihan Kanal di Area Intake 3 Di PT. Indah Kiat Pulp & Paper Perawang

The raw water intake system is an important infrastructure at PT. Indah Kiat Pulp & Paper (IKPP) Perawang, supplying water from the Siak River to support the plant's operational needs. In Intake Area 3, frequent clogging of the
bar screen occurs due to solid waste and water hyacinth, which were previously removed manually by operators. This condition required 2–3 hours for each cleaning process, posed safety risks, and increased head loss, potentially affecting pump performance. This study aims to design and develop a conventional timer based automatic bar screen control system to improve the efficiency of canal cleaning. The system uses non-PLC electromechanical components, including a Time Switch, Time Delay Relay (TDR), Magnetic Contactor, Auxiliary Relay, Thermal Overload Relay (TOR), and Limit Switch. The system is driven by a 2.2 kW three-phase AC induction motor with a 1:60 gearbox reduction ratio. Testing was conducted through laboratory cold tests and 14-day on-site commissioning with several loading scenarios. The results showed that the system was able to perform the cleaning process automatically and sequentially every 2 hours. The Limit Switch effectively controlled the rake movement, while the electrical interlock and TOR protection operated effectively to ensure circuit and motor safety. The cleaning time was reduced to 45.8 seconds per cycle, resulting in more than 99.5% improvement in time efficiency, up to 80% reduction in head loss, and a 66.7% reduction in operator requirements. Therefore, the conventional timer-based bar screen control system can improve the efficiency, safety, and reliability of the
cleaning.