A reject system can often be retrofitted when the existing line provides enough conveyor length, stable product handling, an accessible reject side and usable inspection outputs. A site and controls review confirms whether to add a mechanism to the current conveyor or install a short standalone reject module.
Application engineering
Can a reject system be added to an existing conveyor?
Retrofit feasibility depends on more than fitting a cylinder beside the belt. The assessment covers product spacing, line speed, conveyor construction, side guides, inspection-to-reject distance, guarding, available floor space and the controls responsible for product tracking and fault handling.
Where the existing conveyor is suitable, a pusher, air blast or diverter may be integrated with new sensors, guarding and containment. If the original equipment cannot provide a reliable reject window, a compact standalone conveyor module can create a controlled transfer and reject zone.
The control interface is defined before build: reject signal type, encoder information, line ready and fault signals, emergency-stop boundaries and the response to low air, missing bin, full bin or unconfirmed rejection. This prevents gaps between the inspection machine and line PLC.
Key application considerations
- Existing conveyor feasibility review
- Standalone reject-module option
- Inspection output and PLC integration
- New guarding and reject containment
- Verification and bin sensors
- Installation and commissioning support