Spiral Freezer Controls Modernization

A mechanically functional freezer with an aging control system.

The customer had an existing industrial spiral freezer that remained mechanically functional. The refrigeration and mechanical systems were performing their intended functions.

The control system, however, was aging and needed improved visibility, documentation, alarms and instrumentation — which raised a familiar modernization question: does a functioning machine need an entirely new control system simply because portions of its technology are aging?

The existing PLC could keep serving the machine.

In this case, the answer was no. The existing PLC could continue serving the machine.

Rather than unnecessarily replacing functioning controls, Meray designed the modernization around retaining the existing PLC while improving the system surrounding it — a clear example of evaluate-first.

The freezer, its refrigeration, and its working PLC.

Meray retained the components that were still doing their job and focused engineering effort where it was actually needed.

• ·Existing spiral freezer mechanical equipment
• ·Existing refrigeration functionality
• ·Existing PLC
• ·Existing usable field devices and controls

The operator interface, connectivity and documentation.

Meray reviewed the existing PLC logic, mapped the existing inputs and outputs, and modernized the surrounding controls environment.

• ·Modernized operator interface / screen
• ·Connectivity improvements
• ·Improved remote / network accessibility where appropriate
• ·Review of existing PLC logic
• ·Identification and mapping of existing inputs and outputs
• ·Reconstructed and updated electrical and controls documentation

Alarms, visibility and additional instrumentation.

Where the machine lacked visibility, Meray added it — extending what operators and maintenance could see without disturbing the parts that already worked.

• ·Additional alarm programming
• ·Improved alarm visibility
• ·Integration of additional sensors

Verified against the machine's real operation.

Meray tested the updated controls and verified machine operation before completing the modernization.

• ·Testing of the updated controls
• ·Verification of machine operation

The same freezer, with a modernized controls environment.

The existing spiral freezer remained in service with its functioning mechanical and refrigeration systems, while Meray improved the controls environment, operator visibility, alarms, instrumentation and documentation around the existing PLC.

Modernization can preserve usable capital equipment and avoid unnecessary full-machine replacement.