Key facts
- What it is
- Control-side modernisation only, mechanics untouched
- Typical trigger
- Obsolete relay panel or unavailable drive spares
- Scope
- PLC conversion, drive replacement, console, safety chain
- Machines
- Grinders and other production machinery
- Difference from retrofit
- Narrower scope — no cycle redesign
When an upgrade is the right answer
Not every machine needs a full retrofit. Sometimes the machine still does what you need and does it accurately — it is the panel that has become the liability. A contactor you cannot source, a drive the manufacturer discontinued, a relay board nobody has a drawing for.
A control upgrade replaces that layer and stops there. It is a smaller job, a shorter shutdown and a smaller number than a retrofit, and for a machine whose cycle is already right it is usually the correct call.
What the upgrade covers
- Relay logic to PLC conversion. The existing sequence is traced from the machine and the drawings, rewritten as structured Delta PLC logic, and proved against the machine's actual behaviour before the old panel is scrapped.
- VFD and servo drive replacement. Obsolete drives swapped for current Delta hardware, parameterised and tuned on the machine rather than left at factory defaults.
- New operator console. Push-buttons, selector switches and an HMI laid out for the person who actually runs the machine.
- Safety interlocks and E-stop chain. Guard switches, limit interlocks and a properly wired emergency stop circuit — frequently the part that was quietly bypassed years ago.
Upgrade or retrofit?
The honest answer usually comes out of the survey rather than the phone call. Broadly: if you want the machine to keep doing exactly what it does now but with parts you can buy, that is an upgrade. If you want the machine to hold size better, run an automatic cycle it never had, or take a servo infeed it was not built with, that is a retrofit.
We quote whichever one the machine actually needs, not whichever one is larger.