When a roll forming machine starts showing electrical problems — random stops, overheating panels, sensor failures, VFD trips, or incorrect cut lengths — factory owners face a critical decision:

Do we repair only the faulty areas, or is it time for a complete electrical rewire?

Both approaches have their place, but choosing the wrong one can lead to:

• Ongoing downtime

• Unpredictable machine behavior

• Unsafe operation

• Scrap production

• Higher long-term costs

This guide explains the differences between partial repair and full rewiring, when each is appropriate, and why a properly executed rewire can transform the performance of older roll forming lines.

1. Cost Difference: Partial Repair vs. Full Rewire

Partial Repair — Lower Initial Cost

A partial repair usually involves fixing:

• A faulty sensor

• Damaged cable run

• Burnt relay

• Overheated contactor

• Faulty power supply

• VFD or PLC replacement

Typical cost range:
➡️ $300 – $5,000 depending on parts and labor.

Good for small, isolated issues.

Full Electrical Rewire — Higher Initial Cost, Larger Return

A full rewire includes replacing:

• All wiring and cable harnesses

• PLC and I/O modules

• VFDs/servo drives

• Safety relays and E-stop systems

• Power supplies

• All terminal blocks

• Outdated contactors/relays

• Grounding system

• Cabinet layout and labeling

Typical cost range:
➡️ $12,000 – $45,000+ depending on machine size, region, and upgrades.

A full rewire is a long-term investment, often adding 5–10 years of additional machine life.

2. Time Difference: How Long Each Option Takes

Partial Repair

• Can be completed in 1–6 hours, sometimes same-day

• Minimal disruption

• Fast return to production

Great for short-term fixes.

Full Rewire

• Usually 2–6 days depending on machine complexity

• Requires shutdown and planning

• Followed by commissioning and testing

But once complete, the machine operates like new.

3. Safety Difference: The Most Important Factor

This is where the two options are not equal.

Partial Repair = Localized Safety Fix

• Safe only in one repaired area

• Old wiring may hide other hazards

• Under-rated breakers may remain

• Outdated E-stop circuits may still exist

• Panel may not meet CE/UKCA/UL/OSHA requirements

Good when the rest of the system is still healthy.

Full Rewire = Entire Machine Brought to Modern Safety Standards

A full rewiring includes:

• Dual-channel E-stop upgrade

• Certified safety relay

• PLC safety logic

• Correct grounding

• Proper cable routing and shielding

• Overcurrent and short-circuit protection

• Updated documentation

This eliminates hidden electrical dangers that partial repairs can’t touch.

4. When a Partial Electrical Repair Is Perfectly Fine

A partial repair is appropriate when:

• The machine is under 10 years old

• Panel wiring is clean and modern

• The issue is clearly isolated

• You have accurate, up-to-date drawings

• Cables and terminals are in good condition

• The safety system is modern and compliant

Smart choice for simple failures like:

• Faulty sensor

• Damaged encoder cable

• Burnt contactor

• Loose terminal block

• Blown power supply

If the panel and wiring are otherwise healthy, fix what’s broken — not the whole machine.

5. When a Full Electrical Rewire Is Mandatory

A complete rewire is strongly recommended if you see any of the following:

🚨 1. Overheating or burning smell in the panel

A major fire hazard.

🚨 2. Random shutdowns, resets, or intermittent faults

Indicates unstable control voltage or bad wiring.

🚨 3. Brittle, cracked, or melted wiring insulation

Serious safety risk — requires full replacement.

🚨 4. Outdated PLC or VFD hardware

No spare parts available, unstable, or unsupported.

🚨 5. Machine imported with incorrect voltage or frequency

E.g. 380V/50Hz machine running on 460V/60Hz.

🚨 6. Safety circuits not compliant with CE/UKCA/OSHA

Old E-stop systems are extremely dangerous.

🚨 7. No updated electrical drawings

Indicates years of undocumented modifications.

🚨 8. Moisture, corrosion, or damage inside the cabinet

Causes shorts, noise, and premature component failure.

🚨 9. Machine performance degrading over time

Length drifting, speed unstable, sensors flickering.

🚨 10. Frequent production stoppages

When repairs become monthly — it's time.

If you see even two of these signs, a full rewire is almost always the smartest long-term decision.

6. How a Full Rewire Transforms Accuracy and Performance

A complete electrical rewire brings dramatic improvements:

✔ Improved cut length accuracy

New encoder wiring + stable 24V = consistent length.

✔ Faster machine speed

New VFD and clean power distribution = stable torque.

✔ Zero electrical noise

Proper grounding eliminates sensor and encoder interference.

✔ Reliable punching & flying shear timing

PLC and encoder sync restored.

✔ Lower scrap rate

Accuracy improves significantly.

✔ Faster troubleshooting

Clean panel layout + labeled wiring = instant diagnostics.

✔ Better operator safety

Modern safety relays, E-stops, and interlocks.

✔ Extended machine lifecycle

Old machine runs like a new one for years.

This is why many factories choose a rewire when modernizing older lines rather than buying new equipment.

Machine Matcher CTA — Request a Full Rewire or Partial Repair Quote

Machine Matcher provides:

• Full machine rewiring

• Partial electrical repairs

• PLC & VFD upgrades

• Encoder and sensor rewiring

• Complete safety system upgrades

• Panel redesign & rewiring

• Full compliance inspection

• Updated documentation

• 24/7 remote troubleshooting

• Worldwide on-site technicians

Whether you need a small repair or a complete electrical rebuild, Machine Matcher will guide you to the safest and most cost-effective solution.

Machine Matcher now offers full electrical technician services for roll forming machines — including diagnostics, rewiring, testing, encoder calibration, PLC programming, electrical audits, and preventive maintenance.
We support all machine types and all global regions.
Contact us today for immediate technical assistance or to schedule a full electrical inspection at your factory.

Looking for the right roll forming machine or expert guidance on your next project? Machine Matcher is here to help. Our global team provides 24/7 technical support, expert advice, and guidance on machine selection, setup, and maintenance—ensuring your operations run smoothly from day one.

With team members based worldwide—including the UK, USA, Middle East, and beyond—we are equipped to assist buyers across the globe. Whether you’re sourcing a single machine or upgrading an entire production line, our experts are ready to provide tailored solutions and support every step of the way.

Get in touch now and let Machine Matcher help you find the perfect roll forming machine for your business.

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Phone: +44 20 335 56554

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Phone: +1 407 559 7948

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Email: [email protected]