Universal Grinder Control Panel
A CEJCO case study for universal grinder control panels.
Addressing the Client’s Need
A universal grinder control panel became a necessity due to challenges posed by long supplier lead times and high costs. In this case, a voltage change from 480V to 208V created delays and additional expenses, leaving limited time to find a solution. CEJCO Controls Division recognized the opportunity to provide a replacement control panel that was not only faster but also significantly improved.
A CEJCO Redesign
After reviewing the design requirements, it became apparent that existing solutions lacked flexibility and adaptability. The typical approach involved a current switch with a potentiometer to adjust the trip point manually. This method required the panel to be taken offline repeatedly for adjustments and testing—a process that was time-consuming and inefficient. CEJCO set out to design a more adaptable and universal solution that could support a wide range of voltage and horsepower combinations seamlessly.
The CEJCO Solution
A grinder control panel’s primary function is to detect jams, perform clearing cycles, and return to service automatically. If a jam cannot be resolved, the system should enter a fault state and halt operations. CEJCO’s solution incorporated a current transducer to convert motor current to a 4–20mA signal, which is displayed digitally on the HMI.
Key features of this solution include:
- Digital Adjustments: Setpoints are stored and adjusted via the PLC and HMI, eliminating the need for hardware changes.
- Wide Application Range: The current transducer, with a range of 0–50A, supports applications from fractional horsepower to 30HP.
- Scalability: Operators can scale the signal to accommodate larger motors without reprogramming the system.
- Minimal Hardware Changes: Adjusting for different voltages or horsepower requires changes only to the main disconnect, MSP, and contactors, keeping the system highly versatile.
HMI Screenshots
Benefits of a Flexible Design
At CEJCO Controls Division, each project is approached with a holistic perspective, identifying opportunities for improvement that enhance functionality at minimal additional cost. This approach results in equipment designs that are more flexible, adaptable to a broader range of applications, and easier to implement, leading to reduced lead times and lower engineering expenses.
Delivering Success
CEJCO Controls Division once again demonstrated its ability to respond quickly, delivering a superior solution at a lower cost. This universal grinder control panel sets a new standard in adaptability and efficiency, reflecting the commitment to excellence that defines CEJCO’s work.
