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Brand Diagnostics

Allen-Bradley PLC Repair

Component-level diagnostics and repairs for Rockwell Automation controllers.

Allen-Bradley Technical Service

Allen-Bradley (Rockwell Automation) PLCs are common in automotive, packaging, and process industries. When a CPU, communication bridge, or I/O module experiences an electrical fault, it can impact production. Usha Engineering Services provides repair services for Allen-Bradley controllers, helping to restore them to service.

Supported Hardware Series & Models:

ControlLogix (5550, 5560, 5570, 5580 CPUs)

CompactLogix (1769, 1789, 5069 Series)

MicroLogix (1000, 1100, 1200, 1400, 1500)

SLC 500 (5/01, 5/02, 5/03, 5/04, 5/05)

PLC-5 Legacy Processors

Our Premium 6-Step Component-Level Repair Process

How we restore electronic components to manufacturer specifications

Incoming Visual & Thermal Inspection

Every unit is registered and subjected to high-definition visual inspection and thermal scanning. We identify blown trace lines, scorched resistors, swollen capacitors, and signs of liquid ingress before applying any power.

In-Circuit Analog Signature Analysis

Using advanced Tracker/Signature Analyzers (such as Huntron Trackers), we test passive components (resistors, diodes, capacitors, inductors) and active ICs while in-circuit. This safe, power-off testing compares component electrical signatures against known-good standards.

Semiconductor Power-Stage Diagnostics

For VFDs and servo drives, we test the high-power rectifier and IGBT inverter stages. We check the gate-drive circuit paths, desaturation protections, and replace gate optocouplers to prevent catastrophic future failures.

Microscopic Solder & SMT Reflow

Using ISO-certified temperature-controlled desoldering stations, our IPC-trained technicians replace damaged components. We execute precision micro-soldering under stereo-zoom microscopes for multi-layer PCBs.

Controlled Bench & Load testing

After repair, units are powered on via variable-voltage current-limiting power supplies. We run full closed-loop tests under real load conditions—testing communication links, analog/digital feedback loops, and thermal efficiency.

Final QC Certification & Protective Coating

The repaired PCB is cleaned in an ultrasonic chemical bath to remove flux residues. We apply a high-grade conformal coating to protect against moisture, dust, and corrosive industrial oils before releasing the unit with our warranty.

ISO 9001:2015 Certified

Why Choose Usha Engineering?

26+ Years of B2B Expertise

Established in 2000, we possess over a quarter-century of hands-on industrial electronic repair experience. We are an ISO 9001:2015 Quality Management System certified company.

Up to 70% Cost Savings

Repairing high-end industrial controllers and drives with Usha Engineering is significantly more cost-effective than purchasing expensive new OEM replacement units, which also require configuration.

Advanced Component-Level Lab

Our Panchkula HQ facility features state-of-the-art diagnostic equipment including logical analyzers, digital oscilloscopes, curve tracers, thermal imagers, and dedicated load test benches.

Pan-India Logistics & Quick Turnaround

We accept units shipped via secure courier from anywhere in India, offering express 48-hour turnarounds for critical breakdowns to minimize factory downtime.

Industries We Serve

Steel & Metallurgy

VFDs and PLCs controlling blast furnace loaders, rolling mills, heavy crane lifts, and cooling fans.

Textile & Spinning Mills

High-speed servo drives, HMI panels, and control cards on spinning frames, carding machines, and weaving looms.

Paper & Packaging

Multi-drive tension control systems, synchronous motors, and PLC controllers on web presses and slitting lines.

Pharmaceutical & Chemical

HMIs, PCBs, and control modules in pill press machines, packaging lanes, centrifuge drives, and mixing vessels.

CNC & Automotive Machining

Precision spindle drives, servo controllers, and logic units in 3-axis and 5-axis CNC machining centers.

Warranty Protection

3-Month Service Warranty

We stand behind our work. All board-level repairs performed by Usha Engineering Services are covered by a comprehensive 6-month warranty on replaced components and workmanship. We use only original, high-grade semiconductor parts sourced from certified global distributors.

Need Help Immediately?

Submit a diagnostics ticket or speak directly with an engineer to get a free estimate and arrange unit pickup.

Frequently Asked Questions

Clear answers regarding repair procedures, pricing, and warranties

Can you repair SLC 500 processors?

Yes, we continue to repair SLC 5/03, 5/04, and 5/05 processors, helping clients maintain these legacy systems.

Do you repair ControlLogix 1756 I/O chassis modules?

Yes, we repair digital, analog, and network modules like the 1756-ENBT and 1756-IB16.

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