Servo amplifiers & controllers
TDM analog and digital units, KDS / KDV / KDA / KDF amplifiers, DDS and DKC drive controllers. Power-stage diagnostics, gate-driver work, and control-board repair.
Independent Repair Shop. Not Bosch Rexroth.
Independent third-party repair of Indramat servo drives spanning the full product history: TDM analog and digital controllers, TVD and TVR power supplies, KDS and DDS amplifiers, ECODRIVE, and the current Bosch Rexroth IndraDrive lines. SERCOS interface drives included. Backed by a 19,000+ unit in-house inventory. NC Servo is not affiliated with Bosch Rexroth or the original Indramat. Working on this kind of hardware since 1975.
Brand Heritage
The drives in the field today carry whatever label they were stamped with when the unit was built. Same hardware lineage, different branding generation. We work on units from each one.
Drive Repair
Indramat drives are pure electronics work. Each unit gets opened on the electronics bench, the failed components get identified and replaced, then the drive runs on a load before it ships back.
TDM analog and digital units, KDS / KDV / KDA / KDF amplifiers, DDS and DKC drive controllers. Power-stage diagnostics, gate-driver work, and control-board repair.
TVD, TVR, and TVM Indramat power supply families. Bus capacitor replacement, rectifier work, and output regulation checks under load.
ECODRIVE Cs and DKC families, plus current IndraDrive HCS, HMV, HMS, and HCQ on the same bench as the legacy hardware.
Indramat Families
We are a small repair shop, not a Bosch Rexroth distributor. The families below are simply the ones that come through the door often enough to be familiar. If your unit is not listed, send the part number anyway.
Common Faults
A description of the symptom or fault code helps the diagnosis, but a part number is often enough. The categories below cover the kinds of trouble that show up on Indramat hardware.
| Power stage | Blown power transistors, gate-driver failure, DC bus overvoltage trips, or short-circuit faults on TDM, KDS, and DDS power stages. |
|---|---|
| Power supply (TVD / TVR / TVM) | Aged bus capacitors, rectifier failures, output regulation problems, or no-output conditions on the supplies. |
| Feedback and SERCOS | Resolver-interface faults, encoder signal issues, feedback channel failures, or SERCOS communication errors on digital units. |
| Physical condition | Heat damage on cards, contamination on connectors, corroded mounting hardware, or evidence of prior repair attempts. |
Repair Path
Most jobs run through the same four steps. Lead time varies because some Indramat repairs need parts pulled off a donor unit, so we only commit to timing once a tech has the drive in front of them.
Phone or email with the Indramat part number, fault code if there is one, and a quick note on what the drive was doing.
Once the unit arrives, a tech opens it, inspects boards and the power stage, and runs it on the electronics bench to confirm the fault.
We call back with the cost and a rough turnaround. Nothing happens without your sign-off.
Failed components are replaced from inventory or off donors, the drive is run under load, and the unit ships back.
Bench Verification
Repaired Indramat drives are checked on the electronics bench. Power-stage outputs are loaded, control signals are verified, feedback channels get exercised, and SERCOS-equipped units are communication-checked before shipment.
Inventory & Parts Pool
NC Servo's in-house inventory holds over 19,000 drives and valves accumulated since 1975, including a healthy share of Indramat units from each branding generation. That pool is where the shop pulls aftermarket parts and donor components for older TDM, TVD, DDS, and ECODRIVE families.
Repair Scope
NC Servo handles the drive hardware: boards, power stages, capacitors, gate drivers, feedback interfaces. The drive comes back working in most cases; putting it back on the machine stays with your team or your integrator.
Other Indramat Coverage
Indramat drives often share a machine with hydraulic hardware on the Bosch or Rexroth side. The pages below cover the related lines and the broader drive hub.
The full range of servo drive and amplifier repair NC Servo handles, across the brands that come through the shop.
Current Bosch Rexroth production hardware and the IndraDrive family that replaced the Indramat name.
4WE, 4WS, DBEM, and 4WRPH series. Often paired with Indramat drives on the same machine.
Cross-brand servo-drive option used on retrofit projects when Indramat hardware is being phased out.
Give us a call with the part number, a photo of the nameplate, or a fault code from the drive display. 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.
FAQ
A few things customers ask before sending a unit in. Anything not covered, give us a call at 734-326-6666.
No. NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by Bosch Rexroth AG, Mannesmann Rexroth, or the original Indramat. All Indramat trademarks are the property of their respective owners.
Indramat TDM analog and digital servo controllers, TVD/TVR/TVM power supplies, KDS/KDV/KDA/KDF amplifier families, DDS, DKC, DKS, ECODRIVE, and the current Bosch Rexroth IndraDrive lines (HCS, HMV, HMS, HCQ). Send a part number to confirm coverage on anything not listed.
Yes. SERCOS interface drives go on the electronics bench like any other digital Indramat unit. The hardware repair gets the drive working again, and in most cases the unit ships back with its parameters intact.
Most failures are hardware, and the drive 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.
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 unit ships in, and we can give a current estimate after a tech has looked at it.
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 Indramat or cross-brand alternative.
One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for power surges, environmental damage, and software-driven faults.
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