Product Core Brief
- Model: HMD01.1N-W0020-A-07-NNNN, OEM part number R911295322
- Brand: REXROTH (Bosch Rexroth ctrlX DRIVE / IndraDrive M series)
- Series: HMD modular dual-axis servo inverter family
- Core Function: Convert shared 700 V DC bus power to independent three-phase AC outputs to run two synchronous servo motors with synchronized closed-loop torque, velocity, and position control.
- Product Type: Vertical DIN rail dual-axis power stage module with internal cooling blower, empty expansion slot configuration
- Key Specs: 20 A peak per axis | 700 V nominal DC bus | 4 kW total continuous power | Single-cable MS2N motor support | Condition: Refurbished Load-Tested Surplus
- Suffix breakdown: 01.1 = hardware revision 1.1; N = no integrated internal mains rectifier; W0020 = 20 A peak current rating per axis; A = base hardware variant; 07 = 700 V DC bus voltage class; NNNN = no safety, fieldbus, encoder expansion options populated
Product Introduction
The REXROTH .1N- pairs with HMV regenerative feed-in power supplies to deliver coordinated motion for dual-axis gantries, packaging transfer stations, and substrate handling equipment. It accepts motion setpoints from upper-level PLC or motion CPU over standard digital fieldbus networks.This unit differs from single-axis HMS variants by housing two fully independent power stages inside one DIN footprint, cutting cabinet rack space consumption by nearly 40%. Field data records its typical MTBF at 42,000 operating hours under 24/7 cyclic dual-axis loading at 40 °C cabinet ambient.
Key Technical Specifications
| Parameter | Value |
|---|---|
| DC intermediate bus operating range | 254 V DC to 750 V DC, nominal 700 V DC |
| Peak output current per axis | 20 A RMS short-duration overload (0.5 s max duty) |
| Total continuous rated power | 4 kW dual-axis combined output |
| Three-phase AC motor output | 0–500 V line-line, 0–1000 Hz frequency range |
| Auxiliary control logic supply | 24 V DC (19.2–28.8 V), 0.7 A steady standby draw |
| Cooling system | Internal axial blower forced convection, continuous runtime monitoring |
| Supported motor types | MS2N single-cable synchronous servo, standard multi-wire MKD/MSK servos |
| Encoder interface capacity | Dual independent encoder inputs per module (one per axis) |
| PWM switching frequency | 8 kHz fixed modulation |
| Mechanical mounting | Standard 35 mm vertical DIN rail rack mount |
| Enclosure protection rating | IP20, cabinet-only installation |
| Unit overall weight | 5.27 kg |
| Continuous operating ambient temp | 0 °C to +40 °C full rated power; linear derate above +40 °C up to 55 °C |
| Storage / transport temperature | -20 °C to +70 °C, non-condensing 5–95% RH |
| Integrated protection circuits | DC bus OVP/UVP, phase short-circuit, overcurrent, thermal shutdown, encoder cable break detection |
| Compliance certifications | CE, UL, EN61000 industrial EMC filtering, SEMI S2 cleanroom equipment qualified |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-reference serial number against Rexroth OEM R911295322 vital product databases; inspect blower fan blades for cracking, DC bus terminal lugs for corrosion, and front connector housings for bent pins. Photograph dual-axis motor terminal block pin layout for field installation reference.
- Live Functional Test: Mount module to DIN rail test bench paired with dual MS2N servo motor simulators; run 24 hour synchronized cyclic acceleration/deceleration load profiles. Use a Fluke 115 signal logger to track dual-axis current balance and blower runtime stability.
- Electrical Parameter Test: 500 V Megger insulation test between power stage IGBTs and chassis ground (pass threshold >10 MΩ); verify three-phase output current imbalance stays below 2% mismatch at full 20 A peak load per axis.
- Firmware & Interface Verification: Read and record factory ctrlX DRIVE firmware revision via commissioning PC; confirm dual encoder input handshake and cross-axis synchronization retention after 12 hour power-off cycle.
- Final QC & Packaging: Replace aged DC bus electrolytic capacitors and worn blower assemblies during refurbishment cycles; cap unused motor and DC bus terminal ports with OEM plastic insulating plugs, seal unit in anti-static PE bag, apply dated QC Pass label listing PWM linearity, dual-axis sync stability, and thermal shutdown trigger test metrics before foam-lined carton packing.
Replacement Pitfall Guide
❗ Expansion Option Mismatch: NNNN suffix units have no populated safety or PROFIBUS expansion hardware. Swapping for a BBET suffix variant requires cabinet safety circuit and fieldbus wiring full rework; factory empty-slot defaults will disable machine STO safe torque off logic.❗ DC Bus Polarity Misconnection Risk: Reversed positive/negative DC bus terminals trigger immediate catastrophic IGBT short-circuit failure. Mark bus bar polarity with permanent tags before disconnection to eliminate reverse wiring risk during reinstallation.❗ Single/Dual Axis Cable Incompatibility: MS2N single-cable motor wiring uses combined power/encoder lines; running unshielded single-cable harnesses parallel to DC bus copper bars creates high torque ripple and position drift. Separate motor looms from DC bus hardware by minimum 50 mm inside cabinet trays.❗ Power Supply Headroom Mismatch: The paired HMV regenerative feed-in unit must provide 20% continuous current headroom to support dual simultaneous 20 A peak deceleration events. Underrated rectifiers trigger DC bus undervoltage faults during fast gantry axis moves.❗ 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
- HMS01.1N- → .1N- : Needs Adaptation — add second motor power cable harness, reconfigure motion program for dual-axis synchronous interpolation
- MS2N07-D1BHN-CMSG2NNNNN-NN → .1N- : Direct — native single-cable encoder and 20 A peak axis output matches motor electrical ratings
- HMV01.1R-W0018-A-07-FNN1 → .1N- : Direct — shared 700 V DC bus voltage class natively compatible without bus voltage scaling adjustment
- PPC-R22.1N-N-Q1-NN-NN-FW → .1N- : Needs Adaptation — install separate PROFIBUS expansion card in motion CPU rack for dual-axis setpoint communication
