A large share of the switchgear running in Indian plants today was specified before anyone expected a panel to publish data. It still switches reliably. What it cannot do is tell anyone what it is doing, which is why the maintenance team finds out about a problem when production stops.
Retrofit before replacement
Replacing a functioning motor control centre to gain monitoring is rarely justified. In most cases the existing assembly can stay, and a monitoring layer is built around it: current transformers and multifunction meters on the feeders that matter, remote input and output modules to pick up existing auxiliary contacts, and an edge controller that collects everything and speaks a modern protocol upstream.
What the layers do
- Field layer: meters, sensors and existing auxiliary contacts, wired into remote I/O close to the panel.
- Control layer: a PLC or edge controller that timestamps events and applies any local logic.
- Supervisory layer: SCADA screens for the control room, with alarms, trends and event history.
- Reporting layer: energy management dashboards that turn the same data into consumption and demand reporting by cost centre.
Where projects go wrong
Two mistakes recur. The first is instrumenting everything: hundreds of tags arrive, nobody defines which ones raise an alarm, and the operator learns to ignore the screen. The second is treating the network as an afterthought. Fieldbus segments, protocol conversion and cable routing inside an already crowded panel need drawing before the hardware is ordered.
We usually start with a short list of the loads whose failure actually stops production, instrument those properly, and expand once the plant trusts the data. A retrofit that covers twenty critical feeders and gets used beats one that covers two hundred and does not.
What Zenon supplies
We design and integrate SCADA systems, energy management systems, industrial IoT gateways, fieldbus relay hardware and PLC integration, on new panels and as retrofits onto existing switchgear. If you have an old motor control centre and no visibility, send photographs of the internals along with the single-line diagram and we will suggest a staged approach.