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- Key Technical Specifications
| Parameter | Specification |
| Part Number (MNR) | R911276719 |
| Line Input Voltage | 3 x AC 200 to 480 V (±10%), 50/60 Hz |
| DC Bus Voltage | 700 V DC nominal |
| Continuous Output Current | 100 A |
| Peak Output Current | 100 A |
| Control Voltage Input | 24 V DC (±20%), external supply |
| Command Interface | Configurable via plugin module (SERCOS, Profibus, or Analog/Parallel) |
| Supported Motors | Indramat MKD, MKE, 2AD, and ADF AC servo motors |
| Feedback System | Resolver, EnDat, or optical encoder options via feedback card |
| Enclosure Protection | IP20 (panel mount inside protective control enclosure) |
| Cooling Method | Internal heatsink with forced-air fan cooling |
| Operating Temperature | 0 to +45°C (+32 to +113°F) at full rated capacity |
- Product Introduction
The Rexroth Indramat DKC02.3-100-7-FW (R911276719) is a 100 A high-performance digital AC servo drive controller within the EcoDrive03 family. Operating directly from 200 to 480 V AC three-phase mains, it provides precise velocity, torque, and position loop control for Indramat MKD, MKE, and 2AD dynamic AC motors without requiring external matching transformers.
Designed for modular industrial automation, the DKC02.3 architecture separates the power hardware from the function firmware, allowing custom fieldbus integration via command communication cards. Control engineers specify the R911276719 drive in CNC machine tools, packaging machinery, print/converting lines, and robotic handling cells requiring high power density and reliable multi-axis synchronization.
- Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
| H1 Display shows “F219” or “F220” (Overcurrent) | Motor phase short, grounded motor winding, or shorted IGBT power module | ✅ High | Isolate motor cables (A1, A2, A3) and measure phase-to-phase and phase-to-ground resistance | Check motor insulation with a Megger. If motor and cabling check out normal, internal drive power bridge is blown. Replace unit. |
| H1 Display remains completely dark | Missing 24 V DC control voltage or blown internal power supply board | ✅ High | Measure 24 V DC across control terminals X13 pins 1 and 2 | Verify external 24 V DC auxiliary power supply. If 24 V DC is present at terminal X13, internal power supply card is defective. |
| H1 Display shows “F281” (E-Stop Active) | Open safety circuit chain or dropped 24 V DC signal on E-Stop inputs | ❌ Low | Measure 24 V DC input signal across emergency stop terminals on X13 / X14 | Trace external safety relays and E-Stop button contact block before condemning the drive. |
| H1 Display shows “F860” or “F870” (Position Bus / Comms Error) | Optical fiber damage (SERCOS) or loose fieldbus interface card connection | ✅ High | Inspect fiber optic cables for bend radius breaks or test card seating in option slot | Re-seat communications card. Clean fiber optic ends with alcohol swabs; verify optical attenuation levels across the SERCOS loop. |
DKC02.3-100-7-FW (R911276719)
- Frequently Asked Questions (FAQ)
Q: Does the R911276719 drive include the firmware (FW) pre-installed?
A: The “FW” designation in the model code indicates that the hardware supports pluggable firmware cards (FWA-ECO33*). Drive memory and firmware parameters are stored on a removable firmware module (GSM/software card). When replacing an existing unit, you must swap your original software card into the replacement drive to retain your exact parameter set and motor configurations.
Q: Can I replace a DKC01 series or lower-amperage DKC drive with this DKC02.3-100-7 unit?
A: You can upgrade to a higher current rating (100 A), provided panel dimensions, thermal dissipation space, and braking resistor capacities are respected. However, jumping between DKC01 and DKC02 models requires verifying your master interface (e.g., analog/encoder emulation vs. SERCOS fiber optic bus).
Q: What power safety precautions must be taken before removing this drive?
A: Disconnect 3-phase AC line power and wait a minimum of 5 minutes for the internal DC bus capacitors to discharge. Always measure voltage across DC bus terminals (+ DC and – DC) with a meter to verify potential is below 50 V DC before touching terminal screws or cabling. High voltage on the bus can cause fatal electrical shock.
Q: What is the purpose of the 7-segment H1 diagnostic display on the front face?
A: The H1 display provides real-time drive status (e.g., “bb” for ready, “AF” for drive enable active) and immediate 4-digit diagnostic fault codes (e.g., F218, F860). Using these codes alongside the Indramat EcoDrive troubleshooting manual allows field technicians to isolate external line faults from internal drive hardware failures in seconds.
Q: How are these surplus Indramat DKC drives tested prior to shipping?
A: Every unit passes a complete 5-step SOP quality inspection. We clean and inspect all thermal surfaces, run a 500 V Megger insulation test, insert a master test firmware module, mount the drive on an active test bench connected to an MKD servo motor, and perform a full 24-hour high-torque dynamic load test before ESD-bagging and boxing.
