Before buying a used crushing and screening plant, find out how the controls operate with the existing equipment. A PLC or panel brand alone does not describe the automation scope. Review the relationships between crushers, screens, conveyors and feeders together with the software and handover documents. This guide helps you gather information; it does not replace a technical site assessment.
List the equipment and material flow
Prepare a flow showing where each unit receives material and where it sends it. Distinguish existing crushers, screens, conveyors and feeders from units you intend to add or remove. State whether the plant is mobile, stationary or tracked. The automation scope should be based on the equipment actually present.
Ask about starting, stopping and fault sequences
Learn which steps the operator follows during normal production. Ask how other units are affected if a conveyor or crusher stops. Equipment interlocks and alarm relationships belong in the software review. The suitability of electrical and mechanical protective measures requires the relevant site checks.
Request panel and software documentation together
Gather panel photos, current electrical drawings, PLC/HMI labels, drive models and program backups. The program running in a device may differ from an editable project file. Clarify file versions, required engineering software and usage/modification rights with the seller. If no backup is available, the possible work is defined after reviewing operating sequences and field connections.
Identify the source of measured values
If motor load or material throughput is displayed, ask which sensor or measurement device supplies it. For a belt scale, describe instantaneous flow, accumulated totals and reporting separately. Dosing a truck load using a belt scale is different from installing a vehicle weighbridge. Expectations must be matched to the available hardware.
What changes when another unit is added?
An extra conveyor or crusher may require changes to the program, screens, panel outputs and field connections. List which units will remain and which functions will change. Describe the required behaviour rather than simply saying “renew the automation”; this separates software work from hardware and wiring work.
Clarify commissioning and support
Location, relocation plans and possible production downtime matter when preparing a quotation. Discuss commissioning checks, training and handover files as separate items. Remote access requires internet and suitable access infrastructure. Work requiring site measurements or physical intervention needs separate assessment.
What information can you send for review?
An equipment list, material flow, panel and device photos, existing documents and required changes provide a starting framework. Enopan carries out new automation and retrofit work on mobile, stationary and tracked crushing and screening plants. See our Crushing and Screening Automation service for software, panels and commissioning.
