Independent Repair Shop. Not ABB.

Third-Party Repair of ABB ACS Drives & VFDs

Independent third-party repair of ABB hardware: ACS355 compact AC drives, ACS580 general-purpose drives, ACS880 industrial drives, ABB servo drives, and ABB motion controllers. Component-level work on power supplies, IGBT modules, control boards, and communication interfaces. Backed by a 19,000+ unit in-house inventory we pull aftermarket and donor parts from. NC Servo is not affiliated with ABB. Working on this kind of hardware since 1975.

Get a Repair Quote All Drive Services

Three ACS tiers covered ACS355 compact, ACS580 general-purpose, and ACS880 industrial drives all on the bench.

VFDs + servo drives AC drive power-stage work alongside servo-drive feedback-channel diagnostics.

One-year warranty Standard on parts and workmanship for ABB drive repairs and rebuilt units.

ACS Family Tiers

The ACS family, by tier

ABB's ACS-series AC drives are organized in tiers. Each one shows up here with its own typical failure pattern. The tiers below are the ones that come through most often.

ACS355

Compact AC drive Smaller-frame general-machinery drive. We see capacitor aging, blown input rectifier diodes, and control-board faults on long-running units.

ACS580

General-purpose AC drive Mid-tier industrial AC drive. Common bench items: IGBT module replacement, gate-driver work, and DC-bus capacitor replacement after long service.

ACS880

Industrial AC drive Higher-power industrial drive with modular construction. Power-stage rebuild, fiber-optic interface checks, and control-board diagnostics on the electronics bench.

Servo & MC

Servo drives and motion controllers ABB dedicated servo drives and motion controllers. Closed-loop feedback verification, I/O module replacement, and communication-interface board work.

Service Coverage

What NC Servo does with an ABB drive

Each ABB drive is opened, inspected, and rebuilt at the component level. Failed parts are replaced from inventory or pulled off donor units, then the drive runs under load on the electronics bench before it ships back.

Power supplies and DC bus

Capacitor replacement, supply-rail rebuild, and rectifier diagnostics on ACS-series and servo-drive power sections.

IGBT modules and gate drivers

Failed IGBT modules replaced, gate-driver circuits verified, and protection circuits checked end-to-end before the drive is brought up under load.

Control and communication boards

Control board, I/O module, and communication interface (fieldbus / fiber) board diagnostics, with component-level repair on the signal path.

ABB Coverage

ABB models through the door

We are a small repair shop, not an ABB distributor. The families below are simply the ones that come through often enough to be familiar. If your part number is not on this list, send it anyway. We work on what we can.

ACS355 Compact AC drives for smaller-frame machinery. Common bench items: input diodes, control board, and DC-bus capacitors.

ACS580 General-purpose AC drives. Common bench items: IGBT module replacement and DC-bus capacitor service.

ACS880 Industrial AC drives with modular construction. Common bench items: power-stage rebuild and fiber-optic interface checks.

Servo & motion controllers ABB servo drives and motion controllers. Feedback-channel verification, I/O module repair, and communication-interface boards.

Common Faults

What usually shows up on an ABB repair

A description of the symptom or fault code helps the diagnosis, but a model number is often enough. The categories below cover the kinds of trouble that come in across ABB AC drives, servo drives, and motion controllers.

DC-bus and supply	Failed bus capacitors after long service, blown input rectifier diodes, and failed gate-driver supply rails on ACS-series drives.
IGBT power stage	Blown IGBT modules, failed gate-driver circuits, and protection-trip faults on ACS580 and ACS880 frames.
Control and signal path	Control-board failures, failed voltage regulators, signal-conditioning drift, and bad I/O on motion controllers and servo drives.
Communication and feedback	Fieldbus interface faults, fiber-optic link issues on ACS880 modular frames, and feedback-channel faults on servo drives.

Repair Path

From model number to ship-back

Most ABB jobs follow the same four steps. Lead time varies because some repairs need parts pulled off a donor unit, so we only commit to timing once a tech has the drive on the bench.

Get in touch

Phone or email with the ABB model number, frame size, kW or HP rating, and a quick note on the symptom or fault code.

Bench review

Once the drive arrives, a tech opens it, inspects the power stage and control boards, and runs it under load on the electronics bench to confirm what failed.

Cost & approval

We call back with the cost and a rough turnaround. Nothing happens without your sign-off.

Repair, test, ship

Failed components are replaced from inventory or off donors, the drive is verified under load, and the unit ships back.

Electronics test bench for ABB drive component-level repair at NC Servo Technology

Bench Verification

Each ABB drive gets verified before ship

Repaired ABB drives are tested under load on the electronics bench. Power-stage performance, DC-bus behavior, I/O response, and communication interfaces are all verified against documented procedures.

DC-bus rebuild verified at rated voltage on the supply rail.
IGBT module switching and gate-driver behavior checked under representative load.
I/O response and signal-conditioning verified on motion controllers and servo drives.
Communication interface (fieldbus / fiber) link verified end-to-end where applicable.

Inventory & Parts Pool

A 19,000+ unit pool with ABB hardware in it

NC Servo's in-house inventory holds over 19,000 valves and drives accumulated since 1975, including ACS-series and ABB servo drive donors. That pool is where the shop pulls aftermarket parts and donor components for older ABB drives that the OEM no longer stocks.

Aftermarket and donor parts for ACS355, ACS580, ACS880, and servo drives.
If we have a rebuilt ABB match for your model, trade in your old drive for a discount on the rebuilt.
No match on the shelf? We can suggest a comparable ABB or cross-brand option, or repair yours.
Rebuilt drives carry the same 1-year warranty as a fresh repair.

Stocked shelves of drives and valves at NC Servo Technology

Component-level repair workspace for ABB drives and motion controllers

Repair Scope

Where the line is on an ABB repair

NC Servo works on the drive hardware itself: power stage, DC bus, control boards, I/O modules, and communication interfaces. Drive parameter setup, motion-program development, fieldbus address configuration, and getting the drive back on the machine stay with your team or your installer.

Component-level board repair: power stage, control boards, signal-conditioning electronics.
Communication interface and feedback-channel verification on motion-controller hardware.
Drive parameter configuration, fieldbus addressing, and motion programming remain on your side.
Putting the drive back on the machine follows your normal startup process.

Related pages and brands

ABB drives often share a panel or system with drives from related brands. The pages below cover related coverage and adjacent drive work.

Servo drive repair hub

The full range of servo drive and amplifier repair NC Servo handles, across the brands that come through the shop.

Allen-Bradley drives

Another major industrial drive brand the shop services. Often paired with ABB on the same control panel.

Fanuc drives

CNC servo amplifier brand the shop services. Useful when ABB drives sit alongside Fanuc CNC hardware.

Repair vs replace

When component-level repair makes sense versus buying new or rebuilt.

ABB drive faulted out?

Give us a call with the ACS or servo-drive model number, the frame size, and the fault code if the display still reads. We will check the shelf, and if we have a rebuilt match you can swap your old one for a discount. If we do not, we can suggest a comparable drive or repair the one you have.

Give Us a Call

FAQ

Common questions about ABB repair

A few things customers ask before sending a unit in. Anything not covered, give us a call at 734-326-6666.

Is NC Servo affiliated with ABB?

No. NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by ABB Ltd or any related entities. All ABB trademarks are the property of their respective owners.

Which ABB drives do you cover?

ACS355 compact AC drives, ACS580 general-purpose AC drives, ACS880 industrial AC drives, ABB servo drives, and ABB motion controllers. Send a model number and we will tell you what we have.

What is the difference between an ABB AC drive and a servo drive?

ABB's ACS-series are AC drives or variable frequency drives that control three-phase induction loads with V/f or vector control. ABB also ships dedicated servo drives that close a position or velocity loop with feedback. Both come through the bench, but the repair work is different: VFD work is mostly power-stage and DC-bus, servo-drive work adds feedback-channel diagnostics.

Can NC Servo recover programs or parameters from a failed ABB drive?

Most failures are hardware, and the unit comes back working with its program intact. Corrupted programs are rare; if one is already corrupted before the unit reaches us, that's the one thing we can't recover.

How long does an ABB drive repair take?

It varies. NC Servo is a small independent shop, and lead time depends on the drive, what is wrong with it, and whether parts have to come off a donor unit. Give us a call once the drive ships in, and we can give a current estimate after a tech has looked at it.

What if the ABB drive is beyond economic repair?

If the drive is not fixable, we will let you know and help source a replacement: a rebuilt match if we have one on the shelf, or a comparable ABB or cross-brand alternative.

What is the warranty on an ABB drive repair?

One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for line-side faults, improper installation, and out-of-spec operation. Verifying line voltage, supply protection, and load matching before powering up a repaired drive is recommended.