INVERTER DRIVE REPAIRS

No Fix No Fee AC Drive Repairs

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Professional AC inverter repairs since 1978

Not to blow our own trumpet, but we’re pretty good at inverter repairs and have been carrying them out since 1978. We’ve made our AC drive repair process as simple as possible for you, whilst still providing a thorough, reliable service with a unique No Fix No Fee promise.

Supported brands

We support all the major brands and ranges commonly found in industrial environments as well as more obscure, obsolete AC inverter drives. Typical brands include:

  • ABB

    ABB drives
  • Allen Bradley

    Allen Bradley drives
  • Control Techniques Emerson

    Control Techniques drives
  • Danfoss

    Danfoss drives
  • Lenze

    Lenze drives
  • Mitsubishi

    Mitsubishi drives
  • Schneider

    Schneider drives
  • Yaskawa & Omron

    Yaskawa drives

ABB Drive Repairs

ABB are the biggest variable speed drive manufacturer in the world. We provide ABB drive repairs for all types of ABB drive including inverters from legacy brands like Brown, Boveri & Cie. We support the entire ACS family including the ranges listed below as well as lesser known ranges.

  • ACS-100
  • ACS-200
  • ACS-300
  • ACS-400
  • ACS-500
  • ACS-600
  • ACS-800
ABB AC drive

Allen Bradley

Allen Bradley are part of Rockwell Automation, a huge name in industrial automation who are based in the USA. Variable speed drives are just one of the items manufactured by Allen Bradley that we repair. Here you can find support for all popular Allen Bradley drive families including PowerFlex and Bulletin.

  • PowerFlex 4
  • PowerFlex 70
  • PowerFlex 700H
  • PowerFlex 4M
  • PowerFlex 400
  • PowerFlex 700S
  • PowerFlex 40
  • PowerFlex 700
  • PowerFlex 753
Allen Bradley AC drive

Control Techniques Repairs from an Official Integration Partner

For over 10 years we have been a trusted partner of Control Techniques. As a certified Integration Partner we are authorised to provide the support you need including Control Techniques drive repairs, supply of new parts and upgrades. From the earliest AC drives to the most recent releases such as the Unidrive M.

  • Unidrive
  • Unidrive SP
  • Commander CD
  • Commander CDII
  • Commander CDE
  • Commander GP
  • Commander SE
  • Commander SK
  • Unidrive M
Control Techniques AC drive

Danfoss Drive Repairs from an Official Distributor

Danfoss are a leading global supplier of variable speed drives. Did you know we are an official Danfoss distributor and provide authorised support for all your current and obsolete Danfoss drives? We can help whatever issue you are having with your Danfoss drives from all series and ranges including:

  • VLT3000
  • VLT5000
  • VLT6000
  • VLT2800
  • VLT AutomationDrive FC-301
  • VLT AutomationDrive FC-302
  • VLT Micro Drive
  • VLT Aqua Drive FC-200
  • VLT HVAC FC-102
Danfoss VSD

Repairs for Lenze Inverter Drives

Lenze are another popular brand who are well known for their automation products. Some of their most popular parts are their drives including AC inverter drives, DC drives and servos. Here you can see some of the variable frequency drive ranges we repair including current and obsolete Lenze drive ranges such as:

  • 9300 Vector
  • SMD
  • 8100 Vector
  • 8200 Motec
  • 8200 Vector
  • 8600
Lenze AC drive

Mitsubishi FREQROL Repairs

Mitsubishi’s best known drive family is the FREQROL which comes in a vast array of series. Variable speed drives manufactured by Mitsubishi are installed all over the world from Asia to America. If we listed all the Mitsubishi drives we repair, the list would be longer than this page! So we’ve listed just a few below:

  • FREQROL A200
  • FREQROL A500
  • FREQROL F700
  • FREQROL E700
  • FREQROL K400
  • FREQROL S500
  • FREQROL Z200
Mitsubishi AC drive

Schneider

Schneider Electric are a huge global brand that has many other renowned brands under their umbrella including Telemecanique, Square D and Modicon. We support all current Schneider AC drives as well as legacy speed controllers from brands like Telemecanique.

  • Telemecanique Altivar Series
  • Schneider Lexium
  • Square D Flex 58
  • Square D Omegapak
  • Square D E-Flex
  • Square D M-Flex
Telemecanique inverter drive

Yaskawa & Omron

Yaskawa are a world renowned brand known for their automation and motion control products. The brand originated in Japan but now has their products installed all over the world in applications including welding, packaging, assembly, coating, cutting, material handling and general automation. You may know some of the Yaskawa drive ranges as Omron and vice versa, this is because Yaskawa drives are often rebadged for the European market as Omron. We support both brands and all ranges such as:

  • Sysdrive
  • A1000
  • J1000
  • V1000
  • JUSPEED-F
Yaskawa AC drive

INVERTER DRIVE REPAIR PROCESS

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1

Check price & book your repair online

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Package up your part for our free collection service

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We'll collect your faulty part for free

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Your repaired part will be returned within the specified turnaround

BOOK A FREE COLLECTION NOW!

  • GOING BEYOND THE NORM
  • CHANGING CAPACITORS
  • OUR DRIVE EXPERTISE
  • TESTING YOUR DRIVES
  • GOING BEYOND THE NORM

GOING BEYOND

Cutting corners is easy. Since our warranty is all inclusive and covers the entire drive, not just the parts we change, we do a full preventative maintenance service. This involves replacing all serviceable components that degrade with age, such as capacitors and fans, to prolong the lifespan of your drive.

repairing AC drives
traceability

TRACEABILITY

Each part is given a unique job number so that we can track it every step of the way during a repair.

components

CHANGING COMPONENTS

We change all serviceable components within the drive to increase the overall lifespan and reliability.

cleaning

CLEANING

Parts are cleaned inside and out, removing contaminants from fans and the internal PCBs to increase longevity.

testing

TESTING

Each drive is tested under load for several hours before it is returned to you to make sure it is 100% functional.

  • CHANGING CAPACITORS

THE CAPACITOR

Capacitors are found in each and every drive we repair and are a major pain as they are one of the root causes of drive failure. The liquid electrolyte in each capacitor dries out over time lowering the ESR until the caps blows. Depending on the environment your drive is kept in, this process can be dramatically sped up directly affecting the lifespan of your drive which is why we replace them for new ones.

THIS IS WHAT HAPPENS WHEN YOUR CAPS GO BAD...

capacitor
blown capacitor 01

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Before the unit is even fully disassembled you can see the capacitor has blown a hole through the side.

blown capacitor 02

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As the liquid electrolyte dries out the ESR lowers until the caps blows, in this case spectacularly!

blown capacitor 03

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You can see the inside of the capacitor has blown through the full length of the drive.

blown capacitor 04

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You can see the hole it's made as the leg of the capacitor has shot straight through the steel side plate.

  • DRIVE EXPERTISE

DRIVE EXPERTISE

Experience isn't something that happens overnight. As one of the UK's longest established inverter repair providers we have repaired thousands of drives over the years. We've seen everything - from drives that would fit into the palm of your hand to massive 300kW monsters.

our engineers
training

TRAINING

Our engineers have undergone training with leading OEM's such as Siemens, Control Techniques and Danfoss.

experience

EXPERIENCE

We've been carrying out inverter drive repairs since 1978 and have experience in all kinds of inverter repair.

facilities

FACILITIES

Our 25,000 sq ft state of the art repair facility has bespoke test rigs in place for all your AC drive repairs.

quality

QUALITY

Our process is certified to ISO 9001 accreditation so that you can be 100% confident in the quality of our automation repairs.

  • TESTING DRIVES

TESTING DRIVES

Testing is an important part of the drive repair process which is why we test each drive under load for several hours. We've spent lots of time developing test rigs to be able to functionally test drives in a vast power range to ensure only functioning inverter drives leave our repair facility.

test rig
component testing

INDIVIDUAL COMPONENT TESTING

Before we reassemble a drive we individually test each component to be sure the fault is eradicated.

backup

BACK IT UP

We always back up your drive where possible so that we can reload parameters for you quickly after the drive repair.

bespoke test rigs

BESPOKE TEST RIGS

We've spent hundreds of hours building bespoke test rigs to fully functionality test many different brands and ranges.

load testing

LOAD TESTING

The last step of any inverter is to load test the drive for several hours before we return it to you.

TOP TIPS TO KEEP YOUR DRIVES RUNNING LONGER

We understand that our customers would prefer not to need an emergency inverter repair. In the ideal world inverters, AC drives and variable speed drives would be serviced during a period of planned downtime. This is why we have shared our top tips for keeping your drives running longer:

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VACUUM DUST & DIRT

In a production environment dust and dirt can easily clog up heatsinks. This can cause the inverter to overheat and internal components to malfunction. Dust and dirt can also absorb moisture which can contribute to inverter failure. Simply running an ESD vacuum cleaner over the heatsink or blowing out the heatsink with compressed air is a good preventive maintenance measure and can add years to the life of your inverter. Don’t forget to lock fans.

vacuum dust & dirt
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CHECK OR REPLACE AIR INTAKE FILTERS ON LARGER DRIVES

To ascertain how often you should be checking your air intake filters, frequently check them when the drive is new. This should give you an indication of how often they need to be cleaned and eventually replaced. If you don’t have a dedicated system for planned maintenance simply set a reminder in your Google Calendar to get an email when it’s due.

check the air intake
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MAKE SURE THE INVERTER’S FANS ARE OPERATING CORRECTLY – FREELY ROTATING & NO NOISE

Malfunctioning fans are a major cause of inverter failure. Fans help cool the internal components found within the VSD including electrolytic capacitors. The capacitors are prone to drying out much faster when the internal temperature is too high and can lead to the drive developing intermittent faults such as tripping out after a period of time. Don’t underestimate the effects of heat on an inverter drive, many manufacturers recommend derating the output by up to 15% if the temperature is higher than just 40°C.

make sure fans operate correctly
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ENSURE THE CONTROL PANEL IS WELL VENTILATED

Keeping the control panel well ventilated is necessary to ensure sufficient air flows through the drive to keep it cool. Letting your drive overheat can cause all sorts of problems, from capacitors drying out much faster to complete failure of the VSD.

ensure the panel is well ventilated
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CHECK CONTROL & POWER TERMINALS ARE TIGHT

My Dad always said “to do it right make sure it’s tight.” This is something many people forget to include in their preventative maintenance plan. Loose connections can be attributed to many problems including extra heating and/or arcing, to the extent that connectors can actually be melted down. Other problems that can be caused due to loose control and power terminals include intermittent operation and reduced efficiency. It is recommended that the tightness of connections is checked annually.

tighten the terminals
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BACKUP YOUR DRIVE PARAMETERS

Sounds obvious but many engineers do not have backups of their inverter parameters. This means that should your drive one day fail beyond repair, you can commission a new inverter in as little time as possible. For many users, particularly those with complex applications, the parameters are worth more than the drive, so it only makes sense to keep a backup.

backup parameters
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CHECK THE RESISTANCE OF CONTACTS ON THE DRIVE’S SUPPLY CONTACTORS

Any electromechanical and switching parts are subject to wear, as the contacts become pitted they can lead to an imbalance on your supply causing problems with your AC drive’s bridge and DC bus.

check contacts
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REMOVE LCD PROGRAMMING KEYPADS WHEN NOT IN USE

Leaving an LCD programming keypad attached to a drive is a sure fire way to reduce the keypad’s lifespan. As many of the keypads stay on constantly, the LCD screen eventually dies. This is because they usually have a lifespan of a certain amount of hours and will burn out once they reach the set time. Removing the keypad when not in use will prolong the life so that when you do have a fault with your drive you don’t have to wait for a new keypad before diagnosing it.

remove the keypad
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MAKE SURE WHERE YOUR DRIVE IS INSTALLED IS CLEAN AND DRY

This is especially important for drives with an IP00 or IP20 rating. Drives with these ratings are particularly exposed to contamination from dust. Too much dust can restrict airflow which in turn reduces performance of fans or heatsinks – this can eventually lead to the failure of your drive.

Keeping a drive with a low IP rating in a moist environment is also another sure fire way to lead to inverter failure. Moisture getting into the drive can cause a range of problems, most notably corrosion to the circuit board.

cleaning
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SERVICE YOUR INVERTERS EVERY FIVE TO EIGHT YEARS

Sending your variable speed drives to Northern Industrial every five to eight years can significantly increase the lifespan. By booking a service, you can schedule when it is convenient for you to remove the inverter from operation. During a service we complete all of the above steps as well as replacing components which have a limited life like fans and capacitors.

service your drives

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Let us contact you!

BOOK A COLLECTION

Submit your details and one of our team will call you back to arrange your free repair collection