2026-03-18T15:39:18-05:00

OEM Authorized VFD Repair Services

technician performing vfd repair on industrial equipment

Your variable frequency drive issues expertly diagnosed.

Right down to the component level.

Then, we test them under load to be sure the repair is successful. We know that when your drives fail, there is no time for a lengthy repair process. What you need is a quick and reliable variable frequency drive repair center you can trust. With quality repairs and preventive maintenance, Quad Plus can provide VFD technical support onsite or remotely.

technician performing vfd repair on industrial equipment

OEM VFD Repair Services for All Major Manufacturers

industry trained machine repair experts

Comprehensive Variable Frequency Drive Repair Services

The only thing worse than unexpected downtime is prolonged downtime. When other shops can’t find the answers and you need the right expertise for your systems, frustrations and tensions rise.

Add to that the sticker shock of high quotes for new equipment and weeks-long lead times from other shops. It can seem impossible to find the right solution.

We offer a cost-effective alternative to replacement. You can also choose expedited services that guarantee drive repairs within 2 to 3 business days.

Siemens, ABB, WEG, Allen-Bradley/Rockwell, and Control Techniques Experience

Your equipment likely spans multiple brands and product lines. We service them all! Our expertise and certifications include these Siemens, ABB, WEG, and Control Technique drive product families.

Siemens

  • 6SE Masterdrives
  • 6RA Simoreg / DC Master
  • 6SE Micromaster / MM4
  • 6SL Sinamics
  • 3rW Softstarts
  • 6RA DC Sinamics

We are an authorized Siemens Regional Repair Center.

ABB

  • ACS-880 VFD
  • ACS-800 VFD
  • ACS-550 VFD
  • DCS-800 VFD
  • DCS-550 VFD

We are a Drive Authorized Service Contractor (DASC).

Allen-Bradley/Rockwell

  • Kinetix 5500 Servo Drives
  • PowerFlex 400 AC Drives
  • PowerFlex 700 / 700H AC Drives
  • Bulletin 1389 Power Supplies and Servo Amplifiers

We service and support Allen-Bradley/Rockwell Automation drive and motion control products.

NIDEC/Control Techniques

  • Mentor MP
  • Unidrive SP
  • Unidrive M700 series

We are a NIDEC/Control Techniques authorized repair center.

WEG

  • CFW11
  • CFW11M
  • CFW500
  • SSW07
  • SSW900

We are a WEG Authorized Drive Repair Company.

Benefits of Choosing Professional VFD Repair Services

Expert Technicians

Quad Plus has the tools and expertise to accurately diagnose system issues. Our team troubleshoots variable frequency drives, controls, and circuit breakers. Our nationwide service team of factory-trained engineers and support technicians is available 365 days a year.

Access to Resources

Our resources include manuals, guides, and schematics that give us an advantage in troubleshooting and VFD service. Plus, we carry a huge inventory.

Industry Experience

Our manufacturer-trained engineers and technicians have direct experience with OEMs such as Siemens, Control Techniques, Westinghouse, GE, ABB, and Rockwell, and many also maintain relationships directly with manufacturers.

Legacy Work

Our manufacturer-trained engineers can repair and service legacy controls, drives, and parts. We even maintain devices that OEMs no longer support. Our variable frequency drive repair services reduce downtime and extend equipment lifespan.

engineer performing vfd repair on circuit boards

The Role of VFD Drive Repair in Preventing System Failures

Our experts will quickly diagnose issues with your drive system. Manufacturer-trained technicians will complete all repairs. Every drive undergoes a load stress test before returning to production. Testing follows NEMA standards to verify safe, reliable performance. Proper drive repair can extend the life of your drives by 5 to 10 years.

Technical Consulting

Immediate Answers to Your Questions

Are you experiencing issues with your control system, but concerned about changing settings? Our technical support team will discuss the issues you are facing over the phone and via email. We can review fault codes, photos, and descriptions of the situation. We can then send recommendations and documentation to resolve the issue. We will get you back up and running by pointing you in the right direction.

Remote Support

Instant Support for Your Systems

Our experts provide remote support sessions that allow us to connect to your control systems. We can gather and review information, system alarms, and fault codes. Senior engineers must complete the qualification process before we can connect to new systems. For safety reasons, we will not change any operating parameters or control sequencing. Instead, we will provide recommendations to get you up and running.

Onsite Field Support

Expert Diagnosis & Repairs

Our technicians can also be dispatched to your location to provide onsite VFD technical support. Before dispatch, our engineers assess whether the drive can be repaired onsite or must be sent to our shop. We also offer retrofit options depending on your needs and budget. Our goal is always to provide quick solutions to reduce downtime.

Related Videos

When You Need Solutions, Count on Quad Plus

vfd repair specialist servicing industrial drive system

The Importance of Regular VFD Repair for System Reliability

Waiting For Drive Repairs is Too Costly

What can you do when the manufacturer says it will be weeks for a VFD repair? Who can you call when you need answers instead of more questions? Who will understand how your unique system works? Every minute of downtime is costing you money, and there’s no time for inexperience or long lead times.

A Partner Invested in Your Outcomes

You need access to professional VFD technicians who understand your industrial systems. Our team handles nearly any type of drive failure. We never charge unreasonable prices for an immediate repair. Together, we can solve the cause of your unexpected downtime so you can get back to work fast.

Your Problems, Solved

Quad Plus provides expert onsite services and remote support 365 days a year. Our goal is to solve your problems quickly and in the most efficient, safe, and cost-effective way. Regular variable frequency drive services reduce failures and maintain efficiency. Plus, we offer a one-year warranty on all equipment repairs and services performed by our team.

Expert VFD Repair Solutions, Available 365 Days!

Quad Plus technicians are OEM-trained and have access to an extensive library of OEM guides and schematics.We’re experienced in a variety of situations. You can count on us for all your diagnosis and repair needs. When you need onsite services and remote support, we’re available all day, every day.

More than just VFD repair and service experts, Quad Plus supports the full system integration lifecycle. We’re your trusted partner for engineering, power services, system integration, and industrial safety.

What is the most common fault in VFD?

Before you start the process of VFD troubleshooting, it’s helpful to know about common VFD issues that can arise. Here are some of the most frequent problems you might encounter, leading to VFD repairs:

How to Recognize the Need for VFD Repairs in Your System:

  • IGBT (insulated gate bipolar transistor) module failure.
  • Thermal-related issues.
  • Bus voltage sensing faults.
  • DC bus capacitor failure.
  • Power supply failures.
  • SCR problems.
  • Field control issues.
  • Control circuitry malfunctions.
  • Internal communication errors.
technician working on vfd repair in the control panel

Quad Plus Qualifications:

  • OEM specified parts, test equipment, and fixtures on site.
  • Original design documentation and repair procedures are available.
  • Expertise in reforming bus capacitors, performing full load testing, and manufacturing original parts to exact design specifications.
  • Proficiency in ensuring accurate drive functionality and proper thermal control.
  • Capacity for low-voltage bench tests and high-voltage motor tests.

Our guide on VFD Repair vs Replacement helps you decide whether to repair or replace your equipment. It also explains why preventive maintenance is crucial to achieving optimal performance and longevity.

Yes, We Work in Your Industry

Every industry has its nuances. Different working conditions mean unique problems for drives and equipment. Our professionals understand what makes your systems unique. We can diagnose your technical issues so you can get back to work quickly.

Frequently Asked Questions

2026-03-08T14:26:38-05:00

Timely repair restores optimal motor control for efficient operation. Efficiency reduces operating costs, improves product quality, and extends equipment life. Repaired VFDs maintain precise speed and torque control, improving productivity and reliability.

2026-03-08T14:25:29-05:00

Yes. Quad Plus provides expert VFD repair services across the United States. Technicians are available for onsite visits near your location.

2026-03-08T14:24:59-05:00

VFD service includes thorough inspection, cleaning, component testing, and replacement of worn parts. Maintenance also involves checking connections, updating firmware, and verifying settings. Ensuring proper operation of cooling and protection systems is included.

2025-07-30T11:40:02-05:00

VFD repair involves diagnosing and fixing faults in drives that control motor speed and torque. It’s essential because VFDs regulate critical processes, improve energy efficiency, and protect equipment. Prompt repair prevents downtime while extending the lifespan of the drive.

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