Indramat / Bosch Rexroth
Indramat & Bosch Rexroth Drive Repair (Ecodrive DKC, DDS, HDS, TDM) — Mail-In
Component-level repair for Indramat / Bosch Rexroth drives: Ecodrive DKC, DDS, HDS, TDM, and KDS families still running presses, packaging lines, and machine tools long past EOL. Free evaluation, typical repairs $600–$1,200.
Coverage: Ecodrive DKC01/02/03 · DDS02/03 · HDS · TDM · KDS — long-EOL specialists
✓Fixed — or it's free
Unrepairable units are refunded; evaluations cost $0
✓24-month warranty
Every repair covered, parts and labor
✓3–5 business days bench time
Rush (1–2 day) and emergency service available
✓Program preserved
Your application and settings stay in the unit
Symptoms this repair fixes
- ✓Drive fault codes on the H1 display
- ✓Dead drive
- ✓Trips at enable or under load
- ✓Resolver/encoder interface faults traced to the drive
Honest limits
- ✕Motor-side and mechanical faults (identified at evaluation)
What you get
- ▸Free bench evaluation and firm quote
- ▸Power-stage and gate-driver repair
- ▸Control supply repair and full recap
- ▸Firmware module handled correctly (your FW module returns with your unit)
- ▸24-month warranty
Your program is safe
Ecodrive firmware and parameters ride on the plug-in firmware module — we keep your module with your unit through the whole process.
Common part numbers we see
Part-number pages for this service
How Indramat / Rexroth Drive units actually fail
Most units we receive fail in one of a handful of well-understood ways. Here is what each fault looks like from the machine, what is happening electronically, and what we do about it at the bench.
Aged capacitors throughout
- What you see
- Undervoltage alarms, intermittent faults, or a drive that has become steadily less reliable.
- Why it happens
- Drives of this generation are old enough that the entire electrolytic population is at or beyond design life, not just the obvious bus capacitors.
- What we do
- Capacitors are replaced as a set rather than individually, since on a drive of this age they all share the same service history, and behaviour is verified under load.
Power stage failure
- What you see
- Overcurrent alarms or an immediate trip on enable.
- Why it happens
- Power device failure, usually precipitated by a motor or cable fault at the machine.
- What we do
- Power devices are tested cold and replaced, gate drive verified, and the drive run under load.
Firmware module and connector faults
- What you see
- A drive that will not initialise, or faults that change when the unit is disturbed.
- Why it happens
- These drives use plug-in modules and connectors that, after decades in service, suffer from contact degradation and mechanical fatigue.
- What we do
- Modules and connectors are inspected, cleaned or repaired, and reliable initialisation confirmed repeatedly.
Drives of this vintage are frequently no longer available new in any form, which makes repair less a cost decision than the only route to keeping the machine in production. It also means we are candid during evaluation: if a unit is genuinely beyond economic repair we will tell you, and you pay nothing.
What happens on the bench
The same sequence on every 6-stage repair, so nothing gets skipped because a fault looked obvious.
- 1
Safe intake and bus discharge
Drives arrive holding charge in the DC bus capacitors. The unit is discharged and verified at zero before anything is opened — this is a genuine hazard on any drive with a large capacitor bank, not a formality.
- 2
Power stage integrity check
The IGBT or power module is checked device by device for shorted and open junctions before power is ever applied. Energising a drive with a shorted power module simply destroys more of it, so this is done cold, first, every time.
- 3
DC bus and pre-charge inspection
Bus capacitors are assessed for capacitance loss and elevated ESR, and the soft-charge circuit — inrush resistor and its bypass relay or contactor — is checked. A drive that reports undervoltage or trips on power-up very often has a failed pre-charge path rather than a failed power stage.
- 4
Gate drive and feedback circuitry
Gate driver stages and their isolation are tested, because a partially degraded driver produces asymmetric switching that reads as an intermittent overcurrent fault under load and as a perfectly healthy drive at idle. Encoder and feedback interfaces are checked for the damage a shorted motor cable pushes back into the drive.
- 5
Thermal path and cooling
Fans, heatsink airflow and thermal interfaces are serviced. A large share of "failed" drives are thermal alarms caused by a seized fan or a heatsink packed with production dust.
- 6
Powered test under load
The repaired drive is brought up through a controlled power-on and run against a load so the power stage, current regulation and thermal behaviour are proven in operation — not merely confirmed to power up without alarming.
Check these before you ship
Some of these will tell you the unit is fine and the fault is elsewhere. We would rather you find that out now than pay to ship a good unit.
- □Megger the motor and its cable before condemning the drive. A shorted winding or a cable chafed against the machine frame will destroy a replacement drive exactly as fast as it destroyed the first one.
- □Record the alarm code and what the machine was doing when it tripped — during acceleration, at speed, on a hard stop, or only when warm. That distinction separates a power-stage fault from a thermal or feedback fault.
- □Check whether the cooling fan still spins freely and whether the heatsink is clogged. If the only fault is a thermal trip, cleaning and a fan may fix it on your bench.
- □Confirm incoming line voltage and phase balance. Repeated drive failures on one axis are often a supply or wiring problem the drive is simply reporting.
- □Note your parameter set if you have it recorded. Drive parameters normally live in the CNC or the drive's protected storage and our physical repairs do not touch them, but a record is worth having.
Repair or replace?
Servo and spindle drives are where repair economics are most favourable: the hardware is expensive, frequently obsolete, and often tied to a specific machine and parameter set. New replacements for older platforms are commonly quoted at multi-week lead times when they are available at all, and a like-for-like replacement still has to be parameterised and commissioned against the machine. Because a drive failure usually stops the machine outright, the number that matters is rarely the invoice — it is how many production days pass before the axis turns again.
What to ship
- ▸The drive with its firmware module left installed
- ▸Fault code shown + machine details
Full packing guidance: mail-in instructions.
Ship your unit to
USPS
Control Board Lab
PO Box 120241
Arlington, TX 76012
UPS / FedEx
Control Board Lab
1009 Oakwood Ln # 120241
Arlington, TX 76012
Write your RMA number on the outside of the box and include it on a note inside. Units over 50 lb (large VFDs, spindle drives, industrial PCs in enclosures) ship by freight — contact us before ordering and we will arrange dock-to-dock shipping.
Frequently asked questions
Rexroth says my Indramat drive is beyond end-of-life. Is repair safe?
These drives were built to industrial standards that repair exceptionally well — power stages, supplies, and capacitors are all serviceable with quality components. Repair is how most of the installed base has stayed running since OEM support ended.
Start with a free evaluation
Ship it in, get a firm quote, approve before any work — pay nothing if it can't be repaired.
The Fixed-or-Free Guarantee: if we can't repair it, you don't pay for the repair.
Call (817) 799-7332 · 📱 Text us a photo of your unit · Email repairs@controlboardlab.com