The Case for Custom Industrial Control Panels

Control panels are usually bought on price, and a standard enclosure with standard components is almost always the cheaper line item. The costs that follow are real but harder to see on a purchase order, so they rarely enter the decision.

Where standard panels cost money later

• Access. A panel built to a standard size often leaves no working clearance in front of components. Every future fault takes longer to find and every modification is harder to make.
• Cable entry. When the enclosure does not match the direction cables arrive from, the installation ends up with cables crossing the enclosure, gland plates drilled on site and ingress protection compromised on day one.
• Environment. A panel adequate for a clean workshop is not adequate beside a crusher. Dust ingress on contactors and drives is a slow, invisible failure that shows up as intermittent tripping months later.
• Heat. Drives and soft starters dissipate real power. A standard enclosure with no ventilation or cooling provision will run hot in Saudi ambient conditions, and drive life falls with temperature.
• Expansion. Plants grow. A panel with no spare space and no spare ways means the next motor added requires a second panel, a second isolator and a second cable run.

What a custom panel lets you specify

Building the enclosure to the application rather than fitting the application into an enclosure allows several decisions to be made deliberately:

• Internal layout with real working clearance and logical grouping by circuit
• Enclosure dimensions matched to the wall, frame or room the panel has to occupy
• Cable entry from the correct direction, with gland plates made rather than drilled on site
• Protection level appropriate to the actual environment, including sealing for dusty plants
• Ventilation, filtration or cooling sized against the heat the components will produce
• Spare ways, spare space and spare capacity for the plant's next expansion
• Labelling and ferruling that makes the panel readable by someone who did not build it

Upgrading an existing panel

Replacing a whole panel is not always the right answer. Common upgrades that extend the life of an existing board include converting direct-on-line starters to soft starters or variable frequency drives, adding protection and metering, replacing obsolete contactors and relays, resealing and cleaning contaminated enclosures, and rebuilding one section of a motor control centre while the rest stays in service.

The test that matters

Whether a panel is new or modified, the question at handover is whether it has been functionally tested — not just wired to the drawing. Point-to-point continuity, insulation, and a functional check of every start, stop, interlock and trip is the difference between a panel that works and a panel that has been built.

A note on documentation

A panel without an as-built drawing is a panel that will be diagnosed by tracing wires. Whoever builds the panel should hand over a marked-up drawing reflecting what was actually installed, including any change agreed during manufacture. That document is worth more than most of the components inside the enclosure the first time the plant has a fault at night.