Description
Bosch Rexroth HMD01.1N-W0020-A-07-NNNN | 20A Dual-Axis Inverter
Dynamic Product Introduction
The HMD01.1N-W0020-A-07-NNNN is the middle-current version of the HMD01 double-axis inverter family. It is designed to control two motor axes from a shared DC bus, rather than functioning as a standalone AC-input servo drive. That distinction matters when replacing one in an IndraDrive cabinet: the upstream power supply/converter, DC-link architecture, control section, motor feedback and parameter set all remain part of the system-level compatibility calculation.
The 20 A designation is an effective peak-current rating, while the type code’s 07 identifies a 700 VDC nominal DC bus. The unit uses an integrated blower for internal air cooling and is rated IP20, so cabinet installation is expected. Rexroth documentation identifies the HMD01 family as a double-axis drive controller with 12 A, 20 A and 36 A effective-peak-current variants; the 20 A version is therefore not interchangeable with the visually similar 12 A or 36 A models simply because the mechanical format is similar.
HMD01.1N-W0020-A-07-NNNN
Key Technical Specifications
- Manufacturer: Bosch Rexroth Indramat
- Exact Type Code: HMD01.1N-W0020-A-07-NNNN
- Material Number: R911295322
- Series: HMD01
- System: IndraDrive M
- Function: Double-axis inverter / drive controller
- Number of Motor Axes: 2
- Effective Peak Current: 20 A
- Nominal DC Bus Voltage: 700 VDC
- Documented System DC-Bus Range: Approximately 254–750 VDC
- Output: Variable three-phase AC to the connected motor axes
- Cooling: Internal air cooling with integrated blower
- Protection Rating: IP20
- Integrated Power Supply: None
- Design Version: 1
- Line Version: 1
- Additional Design: NNNN / none
- Cabinet Installation: Yes
- Approximate Weight: 5.6 kg
- Control Auxiliary Supply: 24 VDC support is documented for the family
- Overvoltage Protection: documentation describes protection/discharge circuitry for excessive voltage conditions
- Compatible Architecture: Shared DC bus with IndraDrive power-supply/converter hardware
The 5.6 kg figure and 20 A/IP20/700 VDC specifications are reported for the .1N-W0020 family; the exact physical unit should still be checked against its nameplate before publishing a dimensional or shipping specification.
Type-Code Breakdown
The complete code is useful for procurement because each section identifies a real configuration attribute:
- HMD — HMD double-axis drive controller
- 01 — line
- .1 — Design version 1
- N — No integrated power supply
- W — Internal air cooling with integrated blower
- 0020 — 20 A effective peak current
- A — IP20 protection
- 07 — 700 VDC nominal DC bus
- NNNN — No additional design feature
This decoding is directly supported by Rexroth’s type-code documentation.
Global Sourcing & Live-Test SOP
1. Inbound Verification
Before accepting an .1N-W0020-A-07-NNNN into inventory:
- Photograph the complete front and side labels.
- Confirm the full type code, not merely
orW0020. - Record the material number R911295322 where present.
- Record serial number and hardware revision.
- Inspect the integrated blower and air passages for contamination.
- Check the DC-bus and motor terminals for heat discoloration.
- Inspect connectors for bent contacts or evidence of forced insertion.
- Check the housing for cracks or impact damage.
- Verify that the unit is actually the 20 A version rather than .1N-W0012 or .1N-W0036.
2. Electrical Inspection
Because this is a high-voltage DC-bus drive module, testing should not be reduced to a continuity check.
Recommended inspection includes:
- Visual inspection of the DC-link section.
- Capacitor condition assessment where accessible and appropriate.
- Insulation testing according to the applicable Rexroth service procedure.
- Inspection of power semiconductor circuitry for visible damage.
- Verification of auxiliary 24 VDC behavior.
- Blower operation check.
- Controlled startup using an appropriate drive test setup.
Do not apply an arbitrary megohmmeter test directly across electronic terminals. Semiconductor drive electronics can be damaged by inappropriate insulation-testing procedures.
3. Drive Simulation
A proper bench test should reproduce the intended IndraDrive architecture as closely as practical:
- Compatible DC-bus supply.
- Correct control section.
- Appropriate motor or approved test load.
- Correct feedback device.
- Valid parameter set.
- Correct communication/control interface.
Check for power-section faults, DC-bus abnormalities, motor-phase faults and feedback-related diagnostics.
4. 24-Hour Heat Run
For a used or refurbished unit:
- Run both axes progressively rather than applying full load immediately.
- Monitor blower operation.
- Monitor DC-bus voltage.
- Record power-section temperature.
- Check for abnormal acoustic noise from the blower.
- Monitor fault history and diagnostic messages.
- Record firmware/control-section identification.
- Save the tested parameter configuration separately from the hardware.
Final packaging should protect the power terminals, connectors and blower inlet from impact and contamination.
Field Engineer’s Pitfall Guide
❗ Do Not Confuse the 20 A HMD With the 12 A or 36 A Versions
The family includes 12 A, 20 A and 36 A effective peak-current versions. The physical architecture is similar, but the power rating is not. Verify the complete portion of the nameplate before accepting a substitute.
❗ 700 VDC Is the Nominal DC Bus — This Is Not a 700 VAC Input Drive
The 07 in .1N–A-07-NNNN identifies a 700 VDC nominal DC bus. This module belongs in an IndraDrive DC-bus architecture and is not equivalent to a conventional 400/480 VAC standalone servo amplifier.
❗ Firmware and Control Hardware Still Matter
The HMD power section does not become application-ready merely because it powers up. The connected control section, firmware compatibility, motor data, encoder configuration and parameter set determine whether the axis can actually be commissioned. Rexroth’s broader IndraDrive architecture uses modular power and control components, so preserve the original configuration during a migration strategy.
Intent-Driven FAQ
What is Bosch Rexroth .1N–A-07-NNNN?
It is an double-axis inverter for the Bosch Rexroth IndraDrive M platform. It controls two motor axes from a shared DC bus and has a 20 A effective peak-current rating.
What is the material number?
The .1N- family is associated with R911295322. When buying a replacement, verify both the material number and the complete type code because related HMD configurations use different current ratings and suffixes.
What does mean?
identifies the 20 A effective peak-current version. It should not be interpreted as a continuous 20 A output rating without reference to the applicable motor, duty cycle, thermal conditions and Rexroth sizing documentation.
What does A-07-NNNN mean?
A identifies IP20 protection, 07 identifies a 700 VDC nominal DC bus, and NNNN indicates no additional design feature in the documented type-code structure.
Does this unit have its own AC power supply?
No. The N immediately after .1 identifies the configuration as having no integrated power supply. The HMD operates as part of the larger IndraDrive power architecture.
Can I replace an .1N- with an .1N-W0036?
Not as a blind substitution. The W0036 version has a different effective peak-current rating. Check the motor sizing, control configuration, cabinet design, thermal requirements and system documentation before changing the power section.
s the .1N- obsolete?
Public industrial suppliers continue to list the exact configuration, but that does not establish current OEM production status. For a critical machine, verify current Bosch Rexroth lifecycle/support status and retain the original parameter and firmware records rather than assuming a later HMD variant is a drop-in replacement.
Procurement Description
Bosch Rexrotramat .1N-, Material No. R911295322, double-axis inverter for IndraDrive M systems. 20 A effective peak current, 700 VDC nominal DC bus, IP20, internal air cooling with integrated blower, no integrated power supply, two-axis architecture. Verify control section, firmware, motor/encoder configuration and parameter set before commissioning.
