Power Supply Module Rexroth R911312757 HMV01.1R-W0120-A-07-NNNN

The REXROTH R911312757 HMV01.1R-W0120-A-07-NNNN is a regenerative power supply unit for the Rexroth IndraDrive modular drive platform. It is designed to supply DC bus power to connected drive modules in high-performance industrial automation systems. This unit is used where multiple servo axes need a stable, centralized DC link and where regenerated braking energy should be handled efficiently within the drive system.

The complete identification should always be written as REXROTH R911312757 HMV01.1R-W0120-A-07-NNNN. The order number R911312757 is the purchasing and spare part reference, while HMV01.1R-W0120-A-07-NNNN is the technical type code. For maintenance, replacement, and international procurement, both numbers should be checked together. Similar HMV01 units can have different power ratings, supply modes, cooling arrangements, and system compatibility.

This model is listed as a 120 kW class regenerative supply unit with 3 AC 380–480 V input, 181 A continuous input current, 750 V DC output voltage, DC 700 V bus class, 50–60 Hz nominal mains frequency, 24 V external control voltage, and IP20 protection. Rexroth’s own store page lists the weight as 36.5 kg, while several industrial spare part databases list unpacked weight around 33 kg; for logistics, it is safer to calculate using the official 36.5 kg value and then add packaging weight.

The main function of the HMV01.1R-W0120-A-07-NNNN is to convert three-phase mains power into a controlled DC bus for the connected drive system. In a modular servo architecture, the supply unit works as the energy source for multiple drive modules. Instead of installing an individual power supply for each axis, the machine builder can use one central HMV supply unit to feed several inverter modules through a shared DC link. This approach is common in machines with coordinated multi-axis motion, such as CNC machining centers, printing presses, converting machines, packaging systems, forming equipment, automated handling lines, and large production machines.

The R in the type code indicates a regenerative supply design. This is an important distinction from non-regenerative supply units. In many servo systems, braking or deceleration phases generate electrical energy. A regenerative supply unit can support energy feedback handling as part of the drive system design, depending on the connected components and installation configuration. This makes the unit suitable for applications with frequent acceleration and deceleration cycles, vertical axes, high-inertia loads, or process machines where braking energy management is a technical requirement.

For machine maintenance teams, the R911312757 is often treated as a critical spare part because a failed supply unit can stop the entire drive group. If the HMV01 supply section fails, all connected axes may become unavailable even when the individual drive modules and motors are still in working condition. Typical symptoms in the drive cabinet may include DC bus faults, mains supply alarms, undervoltage or overvoltage messages, blown input protection, unstable drive startup, or repeated system shutdown during acceleration or braking. However, these symptoms should be diagnosed by qualified technicians, because they may also be caused by external wiring, mains supply problems, DC bus wiring, braking components, cooling issues, or connected inverter modules.

A key advantage of the REXROTH HMV01.1R-W0120-A-07-NNNN is its suitability for large modular drive systems. The 120 kW power class gives it enough capacity for demanding installations, while the DC bus architecture allows connected modules to operate as part of one coordinated system. This design helps reduce cabinet complexity compared with separate standalone drive supplies, especially when the machine contains multiple servo axes with shared energy requirements.

The unit is intended for control cabinet installation and should be mounted according to the corresponding Rexroth IndraDrive project planning and installation documentation. Because this is a high-power supply unit, correct installation is not optional. Mains input protection, grounding, conductor cross-section, tightening torque, DC bus connection, control voltage wiring, cooling airflow, cabinet temperature, and protective separation must all be checked before commissioning. Poor installation can reduce service life, create electrical risk, or cause intermittent machine faults.

Cooling is particularly important for this model. High-power supply units generate heat during operation, and cabinet ventilation must be designed around the full drive group, not only the supply module. The installation must allow sufficient airflow and must avoid blocked intake or exhaust areas. If the blower or air path is compromised, the unit may derate, alarm, or suffer premature component failure. For this reason, replacement work should include inspection of fans, filters, cabinet ventilation, dust buildup, and ambient temperature.

From a procurement perspective, the safest description is:

REXROTH R911312757 HMV01.1R-W0120-A-07-NNNN Regenerative Power Supply Unit

This wording includes the brand, order number, complete model, and product type. It is suitable for quotations, spare part databases, warehouse labels, online product pages, and customer communication. For export sales, the product weight should be treated conservatively. Although some spare part pages list 33 kg unpacked weight, Rexroth’s product page lists 36.5 kg, so the packed shipping weight may be significantly higher after adding carton, foam, wooden case, pallet, and moisture protection.

The REXROTH R911312757 HMV01.1R-W0120-A-07-NNNN should be handled only by trained personnel familiar with high-voltage servo drive systems. Even after the mains supply is switched off, the DC bus can retain dangerous voltage for a period of time. Before removal or installation, technicians should isolate the machine, wait for the specified discharge time, measure the DC bus voltage, and follow electrical safety procedures. Direct replacement without checking the surrounding system can be risky, because a damaged inverter module, shorted DC bus, incorrect mains wiring, or failed cooling system can damage the replacement unit again.

This unit is suitable for customers who need to repair or maintain machines using Rexroth IndraDrive M drive architecture. It can be supplied as new, refurbished, or tested used stock depending on availability. When buying a replacement, the buyer should request clear photos of the nameplate, connector area, housing condition, terminal condition, and front panel. For refurbished units, functional testing and warranty terms should be confirmed before shipment.

Overall, the REXROTH R911312757 HMV01.1R-W0120-A-07-NNNN is a high-power regenerative supply unit for industrial multi-axis servo systems. Its role is central to the stability of the drive cabinet because it provides the DC bus power for connected drive modules. The 120 kW class rating, 3 AC 380–480 V mains input, 750 V DC output, IP20 cabinet design, and regenerative supply function make it suitable for demanding automation equipment where reliable power conversion and energy handling are required. For accurate replacement, always verify the full order number R911312757, the complete type code HMV01.1R-W0120-A-07-NNNN, and the original machine configuration before installation.