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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Bosch Rexroth Indramat |
| Material Number | R911295322 |
| Type Code | HMD01.1N-W0020-A-07-NNNN |
| Product Family | HMD Double-Axis Drive Controllers |
| Product Type | DC-fed double-axis inverter |
| Number of Motor Outputs | 2 |
| Nominal DC Bus Voltage | 700 V DC |
| Effective Peak Current | 20 A |
| Continuous Current | 10 A; verify switching-frequency and duty-cycle conditions |
| Output Type | Two independent variable-frequency AC outputs |
| Maximum Output Voltage | Approximately 530 V AC; verify exact system documentation |
| Output Frequency | Verify motor and application configuration |
| Cooling | Internal air cooling with integrated blower |
| Protection Rating | IP20 |
| Supply Architecture | DC bus supplied from compatible Rexroth supply or converter |
| External Auxiliary Supply | 24 V DC connection available; verify wiring requirement |
| Overvoltage Limiter | Activated above approximately 33 V; verify the applicable circuit reference |
| Operating Temperature | 0–40 °C without derating |
| Relative Humidity | Up to 95% |
| Maximum Altitude | 1,000 m without derating |
| Mounting | Cabinet mounting |
| Design Version | 1 |
| Line Version | 1 |
| Additional Features | None identified in the type code |
| Compatibility | IndraDrive M and C systems |
Bosch Rexroth identifies this product as the HMD01.1N-W0020-A-07-NNNN inverter, material number R911295322. HMD01 double-axis inverters receive DC-bus power and generate two independently controlled AC output voltages for two motors.
The published product data specifies a 700 V DC nominal bus, 20 A effective peak current, 10 A continuous current, internal blower cooling, IP20 protection, 0–40 °C operation, and cabinet mounting.
Product Introduction
Bosch Rexroth HMD01.1N-W0020-A-07-NNNN, material number R911295322, is a DC-fed HMD double-axis inverter for controlling two independent AC servo or synchronous motor axes. It uses a 700 V DC bus and provides a 20 A peak-current class with internal blower cooling.
This inverter fits compatible IndraDrive M and C systems used in packaging, handling, machine tools, and coordinated motion applications. Verify the matching supply unit, motor feedback, firmware, parameter set, DC-bus voltage, and both motor output assignments before commissioning.
HMD01.1N-W0020-A-07-NNNN
HMD01.1N-W0020-A-07-NNNN
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No drive response | Missing DC bus, control supply, or communication connection | ✅ High | Measure the DC bus only under approved procedures and check the 24 V auxiliary supply if used | Verify the supply unit and control wiring before replacing the inverter |
| DC-bus undervoltage alarm | Supply-unit fault, open bus connection, or insufficient line input | ✅ High | Read the drive diagnostic and measure the bus at the approved test points | Diagnose the supply module and bus links first |
| One motor axis works, the other does not | Axis-specific motor cable, encoder, parameter, or power-stage fault | ✅ High | Swap only approved diagnostic components and compare axis-specific error data | Test the affected axis independently; do not replace the complete unit prematurely |
| Both axes fail simultaneously | Shared DC bus, control power, communication, or inverter fault | ✅ High | Check common supply, enable signals, bus voltage, and controller diagnostics | Investigate shared infrastructure before condemning both outputs |
| Overcurrent on startup | Shorted motor cable, incorrect motor data, seized mechanics, or wrong axis assignment | ✅ High | Isolate each motor cable and test phase-to-phase and phase-to-ground resistance according to OEM limits | Check motor, cable, and load before replacing the HMD01.1N |
| Motor will not enable | Drive inhibit, safety interlock, missing enable command, or parameter lock | ✅ High | Check controller enable, safety status, axis state, and diagnostic memory | Clear the inhibit cause and verify the axis configuration |
| Encoder error | Incorrect feedback type, damaged cable, or incompatible motor | ✅ High | Inspect feedback connectors and compare the configured encoder with the motor nameplate | Confirm the approved feedback interface before substitution |
| Drive overheats | Blower failure, blocked airflow, high cabinet temperature, or excessive duty cycle | ✅ High | Confirm blower operation and measure temperature around the inverter | Restore airflow and check the load profile before replacing the drive |
| SERCOS or system communication fault | Fiber break, incorrect ring order, node configuration, or firmware mismatch | ✅ High | Inspect fiber transmit/receive paths and review controller ring diagnostics | Correct the communication ring before replacing the inverter |
| Axis oscillates or hunts | Incorrect tuning, motor data, feedback signal, or mechanical resonance | ✅ Possible | Trend commanded and actual position at low speed and review tuning parameters | Recommission the axis before replacing the power unit |
| Replacement trips immediately | Wrong type code, incompatible supply, parameter mismatch, or firmware issue | ✅ High | Compare every type-code field and restore a validated parameter backup | Do not use a visually similar HMD or HMS unit without compatibility approval |
| DC bus remains charged after shutdown | Normal capacitor discharge delay or discharge-circuit fault | ✅ High | Follow the OEM discharge-time procedure and verify voltage with a properly rated meter | Do not touch the bus until measured voltage is at the safe limit |
Critical warning: This inverter operates on a high-voltage DC bus. Apply lockout/tagout, wait the manufacturer-specified discharge period, and verify the bus with a properly rated meter before handling terminals. If the fault remains, provide the exact diagnostic code, supply-unit model, motor models, firmware, bus measurement, axis assignment, and cabinet photographs.
Frequently Asked Questions (FAQ)
What is Bosch Rexroth HMD01.1N-W0020-A-07-NNNN?
It is a Bosch Rexroth Indramat HMD double-axis inverter, material number R911295322. It receives DC-bus power and controls two independently operated AC motor outputs.
What does the 20 A rating mean?
The 20 A value is the effective peak-current classification. Published distributor data lists 10 A continuous current, but the usable continuous rating depends on switching frequency, ambient temperature, motor duty cycle, and cabinet cooling.
Which Bosch Rexroth systems use this inverter?
The .1N-W0020-A-07-NNNN is listed for IndraDrive M and C system compatibility. Confirm the matching power supply, controller, feedback interface, firmware, and system generation before installing it.
Is this a single-axis or dual-axis drive?
It is a dual-axis inverter with two independent motor outputs. Each axis still requires its own motor data, feedback connection, parameters, enable logic, and mechanical validation.
Does it include a power supply?
No. The unit is supplied from a compatible DC bus generated by an appropriate Rexroth supply unit or converter. The type code indicates no integrated power-supply function.
Can I replace it with another unit?
Only when the complete type code and electrical ratings match. Compare bus voltage, peak and continuous current, firmware, feedback options, output configuration, temperature derating, and parameter compatibility. Do not substitute an HMS unit solely because the current rating appears similar.
Is firmware included?
Do not assume firmware is included. Confirm the firmware identity and machine parameter backup before ordering. A replacement inverter can power up correctly yet fail to initialize because the control firmware or axis configuration does not match the machine.
Is the unit new or refurbished?
The model number does not establish condition. State the actual status as New Original, New Surplus, or Refurbished (tested). For refurbished stock, document DC-bus startup, both axis outputs, encoder feedback, communication, blower operation, protection trips, insulation checks, and loaded testing with compatible motors.
