Product Core Brief
- Model: DKC11.1-040-7-FW
- Brand: REXROTH (Indramat ECODRIVE DKC series)
- Series: .1 standalone servo amplifier family
- Core Function: Run closed-loop current, velocity, and position control for permanent magnet servo motors via analog ±10 V setpoint or internal motion block sequencing.
- Product Type: Vertical DIN rail single-axis servo drive with internal cooling blower, base factory FW firmware
- Key Specs: 40 A continuous RMS output | 700 V nominal DC bus | 8 kHz PWM switching | 32 onboard motion blocks | Condition: Refurbished Load-Tested Surplus
- Suffix breakdown: 11.1 = hardware revision 1.1; 040 = 40 A rated output; 7 = 700 V DC bus class; FW = preloaded standard ECODRIVE motion firmware FWA-ECODRV-ASE-02VRS-MS
Product Introduction
The REXROTH .1-040-7-FW delivers high dynamic single-axis control for machine tool and substrate handling axes, pairing directly with MKD frame synchronous servo motors without a separate motion CPU for simple standalone sequences. It accepts analog speed/position commands from PLC analog output modules or executes pre-stored motion profiles autonomously.This unit differs from smaller DKC01.1 variants by offering 40 A continuous current and a larger integrated blower to sustain full rated output at 40 °C cabinet ambient. Field data records its typical MTBF at 42,000 operating hours under 24/7 cyclic press loading.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Three-phase mains input | 3×380–480 V AC, 50 / 60 Hz |
| Nominal intermediate DC bus voltage | 700 V DC |
| Continuous RMS motor output current | 40 A |
| Peak overload output current | 120 A (0.5 s maximum duty cycle) |
| PWM switching frequency | 8 kHz |
| DC bus onboard capacitance | 0.15 mF |
| Total power dissipation at full load | 180 W |
| Auxiliary control supply | 24 V DC (19.2–28.8 V range), 0.7 A steady draw |
| Cooling system | Internal axial blower forced convection |
| Position control memory capacity | 32 independent motion profile blocks |
| Command input standard | Differential ±10 V analog speed / position setpoint |
| Serial commissioning port | RS232 D-Sub for DriveTop PC software |
| Supported encoder types | Incremental TTL / EnDat absolute multiturn |
| Mechanical dimensions (H × W × D) | 360 mm × 210 mm × 65 mm |
| Net unit weight | 4.4 kg |
| Enclosure protection rating | IP20 (cabinet-only installation) |
| Continuous operating ambient temp | 0 °C to +40 °C full rated output; 2% performance derate per °C above 40 °C |
| Storage temperature range | -20 °C to +70 °C, non-condensing 5–95% RH |
| Built-in protection circuits | OCP overcurrent, OVP/UVP DC bus, over-temperature, motor short-circuit, encoder cable break detection |
| Compliance standards | CE, UL, EN61000 industrial EMC filtering |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-reference serial number against Rexroth Indramat OEM part databases; inspect blower fan blades for cracking, DC bus terminal lugs for corrosion, and front RS232 port pins for bending. Photograph terminal block pin layout for field wiring reference.
- Live Functional Test: Mount unit to DIN rail test bench paired with MKD071B servo motor simulator; run 24 hour cyclic acceleration/deceleration load profiles. Use a Fluke 115 signal logger to track analog setpoint linearity and blower runtime stability.
- Electrical Parameter Test: 500 V Megger insulation test between power stage and chassis ground (pass threshold >10 MΩ); verify three-phase output current balance remains under 2% mismatch at full 40 A load.
- Firmware Verification: Read and record loaded FWA-ECODRV-ASE-02VRS-MS firmware revision via DriveTop; confirm all 32 internal motion blocks store and recall position values after 12 hour power-off retention test.
- Final QC & Packaging: Replace aged DC bus electrolytic capacitors and worn blower assemblies during refurbishment cycles; cap unused RS232 and motor power ports with OEM plastic plugs, seal unit in anti-static PE bag, apply dated QC Pass label listing PWM linearity and thermal shutdown trigger test metrics before foam-lined carton packing.
Replacement Pitfall Guide
❗ Firmware Mismatch Risk: Older DriveTop V3 software cannot read expanded 32-motion-block register data. Install V4 or newer commissioning software before swapping the unit, or internal position sequencing will lock up during production cycles.❗ Terminal Jumper Misconfiguration: Factory default jumpers enable incremental encoder feedback. Units paired with EnDat absolute motors require manual jumper repositioning; unadjusted jumpers trigger constant encoder fault alarms on power-up.❗ Power Cable Cross-Talk Incompatibility: Unshielded motor power cables run parallel to analog setpoint wiring create torque ripple and axis position drift. Separate high-current power looms from low-level analog signal cables by a minimum 50 mm inside cabinet trays.❗ DC Bus Supply Mismatch: Shared rectifier HMV units must provide 20% continuous current headroom to support the drive’s 40 A peak demand. Underrated feed-in power supplies trigger DC bus undervoltage faults during fast axis deceleration.❗ ESD Power Stage Damage: Unshielded encoder input ASICs carry low electrostatic tolerance. Always rest the unit on a grounded anti-static mat during terminal block rewiring, especially in low-humidity cleanroom environments.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- DKC01.1-040-7-FW → .1-040-7-FW : Needs Adaptation — reconfigure encoder jumpers, upload expanded motion block parameter library to match machine sequence logic
- MKD071B-061-KP0-KN → .1-040-7-FW : Direct — native EnDat encoder input and 40 A continuous output matches motor electrical ratings
- VT-VPCD hydraulic axis controller → .1-040-7-FW : Direct — ±10 V analog position setpoint signal is natively accepted without signal conditioning hardware
- PPC-R22.1N-N-Q1-NN-NN-FW → .1-040-7-FW : Needs Adaptation — adjust DAQ output scaling to match drive 10 V full stroke position range
