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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Bosch Rexroth Indramat |
| Material Number | R911295326 |
| Type Code | HMS01.1N-W0070-A-07-NNNN |
| Product Family | IndraDrive M |
| Product Series | HMS Single-Axis Inverters |
| Product Type | DC-fed single-axis inverter |
| Number of Axes | 1 |
| DC Input Voltage | 254–750 V DC |
| Nominal DC Bus Voltage | 700 V DC |
| Rated Maximum Current | 70 A |
| Output Current | 42.4 A |
| Output Voltage | 0–500 V AC |
| Maximum Output Frequency | Up to 1,600 Hz at 16 kHz switching; verify application settings |
| Rated Control Voltage | 24 V DC |
| Cooling | Internal air cooling with integrated blower |
| Internal Power Supply | Not equipped |
| Protection Rating | IP20 |
| Power Consumption | Approximately 16 W control consumption |
| Short-Circuit Current Rating | 42,000 A RMS |
| Operating Temperature | 0–40 °C without derating |
| Installation Altitude | Up to 1,000 m without derating |
| Relative Humidity | Up to 95% |
| Width | Approximately 100 mm |
| Height | Approximately 440 mm |
| Depth | Approximately 309 mm; verify mounting drawing |
| Weight | Approximately 7.94–9.4 kg, depending on catalog revision and scope |
| System Integration | IndraDrive M modular drive system |
| Motor Output | Three-phase controlled AC output |
| Firmware | Verify control-unit and firmware requirements separately |
Bosch Rexroth identifies HMS01.1N-W0070-A-07-NNNN, material number R911295326, as an HMS single-axis inverter supplied from a DC bus. It generates a regulated AC output with variable amplitude and frequency for one motor.
Published data lists a 254–750 V DC input range, 700 V DC nominal bus, 70 A maximum-current classification, 42.4 A output current, 0–500 V AC output, internal blower cooling, and IP20 protection.
Product Introduction
Bosch Rexroth HMS01.1N-W0070-A-07-NNNN, material number R911295326, is an IndraDrive M single-axis inverter power section for high-power servo and synchronous motor applications. It accepts a high-voltage DC bus and produces controlled three-phase AC output up to 500 V.
This module belongs in a compatible Rexroth modular drive system with the correct supply unit, control section, feedback interface, firmware, and motor parameters. Verify the 70 A current class, 42.4 A output rating, bus voltage, cooling clearance, and motor cable arrangement before commissioning.
HMS01.1N-W0070-A-07-NNNN
HMS01.1N-W0070-A-07-NNNN
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No response from the axis | Missing DC bus, 24 V control supply, or control-unit communication | ✅ High | Check the DC bus and 24 V control supply using the approved Rexroth test procedure | Verify the supply unit and control section before replacing the HMS01.1N |
| DC-bus undervoltage alarm | Supply-unit fault, open bus connection, or incorrect mains-side configuration | ✅ High | Read the diagnostic code and measure the bus at approved test points | Repair the supply path before condemning the inverter |
| Overcurrent on enable | Motor cable short, incorrect motor data, seized mechanics, or wrong output assignment | ✅ High | Isolate the motor cable and test phase-to-phase and phase-to-ground resistance within OEM limits | Check the motor and cable before replacing the power section |
| Axis trips during acceleration | Excessive acceleration, load inertia, current limit, or tuning issue | ✅ High | Trend actual current and compare with the configured motor and drive limits | Correct sizing, tuning, or mechanical loading before replacement |
| Encoder or feedback alarm | Incorrect feedback device, damaged cable, or incompatible control unit | ✅ High | Inspect feedback connectors and compare encoder data with the motor nameplate | Verify the control-unit and encoder combination |
| Motor will not enable | Drive inhibit, safety interlock, missing enable command, or active fault | ✅ High | Check the axis state, enable signal, safety status, and error memory | Clear the inhibit cause; do not force the enable |
| Communication fault | Control-unit mismatch, fiber/network issue, or firmware incompatibility | ✅ High | Review controller diagnostics and inspect the communication path | Confirm the complete modular-drive configuration before replacement |
| Blower alarm or overheating | Failed blower, blocked airflow, high cabinet temperature, or excessive duty cycle | ✅ High | Confirm blower operation and measure air temperature at the inverter | Restore airflow and reduce thermal loading before replacing the unit |
| Motor vibrates or hunts | Incorrect tuning, feedback noise, mechanical resonance, or wrong motor parameters | ✅ Possible | Compare commanded and actual position at low speed and inspect feedback quality | Recommission the axis before replacing the inverter |
| Replacement trips immediately | Wrong type code, incompatible bus voltage, parameter mismatch, or firmware issue | ✅ High | Compare every type-code field and restore a validated parameter backup | Do not substitute another HMS unit by current rating alone |
| Output is present but motor overheats | Motor data error, high switching loss, overload, or inadequate cooling | ✅ High | Compare motor current and temperature with the configured motor data | Correct parameterization and load conditions before replacement |
| DC bus remains energized 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 power terminals until the measured voltage is safe |
Critical warning: This module operates on a high-voltage DC bus and produces hazardous three-phase output. Apply lockout/tagout, wait the manufacturer-specified discharge time, and verify the bus voltage before handling the inverter. If the fault remains, provide the exact alarm code, supply-unit model, control-unit model, motor nameplate, firmware, bus measurement, and cabinet photographs.
Frequently Asked Questions (FAQ)
What is Bosch Rexroth HMS01.1N-W0070-A-07-NNNN?
It is a Bosch Rexroth Indramat IndraDrive M HMS single-axis inverter, material number R911295326. The module accepts a high-voltage DC bus and controls one motor with variable-voltage, variable-frequency AC output.
Is this a conventional AC-input VFD?
No. It is a modular DC-fed inverter power section. The DC bus normally comes from a compatible Rexroth supply unit or converter rather than from a direct three-phase AC input to the HMS module.
What does the 70 A rating mean?
The 70 A figure is the rated maximum-current classification. Published data lists 42.4 A output current for the operating specification. Actual continuous capability depends on switching frequency, ambient temperature, motor duty cycle, cooling, and application parameters.
Does the module include a control unit?
The type code identifies an HMS power section, not a complete standalone drive package. Confirm the required Rexroth control unit, firmware, feedback interface, communication architecture, and parameter memory before ordering.
Can I replace it with an HMS01 unit having a different current rating?
Not automatically. Compare DC-bus range, output current, motor compatibility, control-unit pairing, firmware, cooling requirements, dimensions, and parameter support. A different current class can also affect motor-cable protection and cabinet thermal calculations.
Does it include Safe Torque Off?
The complete safety function depends on the compatible Rexroth control and safety architecture. Do not assume that the power section alone provides a complete STO circuit. Verify the control-unit documentation and machine safety design before commissioning.
What should I check before installation?
Record the old module’s complete type code, control-unit model, firmware, motor model, feedback type, supply-unit model, parameter backup, bus wiring, motor cable, and cooling arrangement. Also confirm the approximately 100 mm width, 440 mm height, and required cabinet clearance.
Is the unit new or refurbished?
The part number does not establish condition. State the actual status as New Original, New Surplus, or Refurbished (tested). For refurbished stock, document DC-bus startup, control communication, blower operation, output-stage testing, fault monitoring, insulation checks, and loaded motor testing with compatible Rexroth equipment.
