Biesse Selco repair: A Case Study
Discover how our expertise in the wood industry can resolve frequent operational issues with Biesse Selco machines, enhancing efficiency and productivity in your manufacturing process.
Challenging Faults with Biesse Selco Machines: Working with Biesse Selco machines can sometimes present unique challenges, particularly when dealing with older models. Here’s a breakdown of how we successfully resolved a complex fault, showcasing our approach and expertise:
Initial Fault: The machine would home and start to go through its automatic cycle. When the machine attempted to start, the Pusher and an additional pusher were supposed to drop. However, when the pusher started to move from the raised position, the machine would fault and the control voltage (green indication LED) would turn off. Alongside this, an error appeared on the screen: “Additional pusher down when Pusher up.”
Diagnostic Process: We examined the schematic and found that the drawing descriptions (Inputs and Outputs) did not match the errors on the computer screen (HMI). We observed the machine and discovered that there are limit switches on the top of the main pusher and additional pusher (left and right side of the machine). The limit switches had no identification on them, so we followed the cables back to a junction box at the front of the machine. After locating the “remote” PLC card, we could monitor the input signals when the machine was trying to run in automatic.
Identifying the Issue: Monitoring the signals, input 8 on the IO card showed that the signal was flashing intermittently when the pusher solenoid had fired (the output signal for the solenoid is different from the input signal for the limit switch). When the signal flashed, the machine went into fault.
Testing Components: We removed the limit switch from the machine and tested it by hand. The normally open circuit was switching, displaying OL on the multimeter and then 0.2 ohms. The normally closed circuit stayed closed at 0.2 ohms regardless of the switch's operation. We knew that this needed changing.
Sourcing Replacement Parts: Due to the age of the machine, we had to source a different type of limit switch. The original was a Pizzato FA4615-2DN; we sourced a new switch from RS Components, described as LS M20 Metal roller 9026874. They had over 1000 in stock and used the same mounting points as the Pizzato.
Installation: We fitted the new limit switches to the machine after a slight modification to the mounting plate (we didn’t have any M4x40mm bolts) and drilled and tapped the existing plates with an M5 tap.
Testing and Final Setup: After fitting the limit switches (which are a nightmare), we ran the machine in anger.
Struggling with your Biesse Selco or any CNC wood cutting machinery? Don’t let machine downtime hinder your productivity. Contact APENG Electrical today for expert support:
🔧 Industrial Electrician & Technician
⚡️ Specialising in Industrial Machinery
🔄 Repair, Retrofit, and Replace
📍 Serving Yorkshire and Surrounding areas
Biesse Selco machine working after replacing the faulty electrical components.
Biesse Selco Remote IO/ Remote PLC.
Faulty Limit switch
For more technical information on the Biesse selco machine visit https://biesse.com/gb/en/machines-wood/wood-cutting/
