Bosch Rexroth R911 AS-S911-003 Ruggedized Servo Drive Module

Product Overview

Bosch Rexroth R911 AS-S911-003 Ruggedized Servo Drive Module for Harsh Industrial Environments

The Bosch Rexroth R911 AS-S911-003 is a high-performance servo drive control module from the renowned IndraDrive series, engineered to deliver precise motion control and unwavering reliability in the most demanding industrial environments. Designed to operate continuously under conditions of elevated temperature, high humidity, airborne particulate contamination, mechanical vibration, and intense electromagnetic interference, this module represents the gold standard for ruggedized servo drive technology in heavy industry and critical infrastructure applications.

Built on Bosch Rexroth’s decades of engineering excellence in drive and control technology, the R911 AS-S911-003 integrates seamlessly into multi-axis servo systems where uptime is non-negotiable. Whether deployed on a high-speed packaging line, a precision CNC machining center, or a continuous-process petrochemical plant, this module maintains stable closed-loop control even when ambient conditions fluctuate beyond the tolerances that would compromise lesser components.

Rugged Specifications Table

Comprehensive Protection Solutions

The R911 AS-S911-003 control section is designed to operate as part of a fully integrated IndraDrive system architecture. In a typical servo cabinet installation, it works in concert with the Bosch Rexroth HCS02 or HCS03 power section, which supplies the DC bus voltage and handles regenerative braking energy. The control section communicates with the host controller — commonly a Bosch Rexroth IndraMotion MLC or MLD motion logic controller — via SERCOS III or EtherCAT, enabling deterministic real-time motion coordination across multi-axis gantry and robotic systems.

For installations requiring functional safety, the AS-S911-003 supports optional Safe Torque Off (STO) and Safe Stop 1 (SS1) safety functions in compliance with IEC 62061 and ISO 13849-1 PL d, making it compatible with safety relay modules such as the Bosch Rexroth SafeLogic or third-party safety PLCs. In control cabinets where multiple drives share a common DC bus, the module integrates with Rexroth HMV supply units and HNF mains filters to suppress conducted EMI and protect sensitive I/O modules from voltage transients.

On the field side, the R911 AS-S911-003 interfaces with a wide range of Rexroth servo motors from the MSK, MKD, and MHD series, supporting EnDat 2.2 and Hiperface absolute encoders for single-cable feedback. In legacy retrofit projects, it also accepts resolver and TTL incremental encoder signals, allowing engineers to reuse existing motor assets while upgrading the drive intelligence. Complementary components such as Rexroth R911 motor cables, encoder cables, and shield clamps are recommended to maintain signal integrity in high-vibration or high-EMI environments such as press lines and rolling mills.

When integrated into a broader automation architecture, the AS-S911-003 coexists with Siemens SIMATIC S7-300/S7-400 PLCs or Allen-Bradley ControlLogix controllers via gateway modules, enabling mixed-vendor installations common in brownfield upgrades. Terminal modules and distributed I/O racks — including Bosch Rexroth Inline I/O modules — can be daisy-chained on the same PROFIBUS or EtherCAT segment, reducing cabinet wiring complexity and improving diagnostic transparency.

Application in Critical Infrastructure

In oil and gas upstream and midstream facilities, the R911 AS-S911-003 drives pump jacks, compressor actuators, and valve positioners where continuous operation under high ambient temperature and corrosive atmospheres is mandatory. Its robust EMC design prevents nuisance trips caused by variable-frequency drive interference on shared power rails — a persistent challenge in offshore platform electrical systems.

In mining and mineral processing, the module controls conveyor belt servo drives, crusher feed systems, and flotation cell agitators. Mechanical shock and vibration from blasting operations and heavy-load starts are absorbed by the module’s reinforced PCB mounting and conformal-coated electronics, ensuring uninterrupted production throughput.

In power generation and utilities — including coal-fired, gas turbine, and hydroelectric plants — the AS-S911-003 manages turbine governor actuators and cooling tower fan drives. Its wide operating temperature range and compliance with IEC 60068 environmental testing standards make it suitable for both indoor switchgear rooms and semi-exposed outdoor enclosures.

In metallurgy and steel production, the module is deployed on rolling mill main drives, coiler tension control systems, and ladle transfer cars. The ability to handle rapid acceleration and deceleration cycles with precise torque control reduces material waste and improves product dimensional consistency.

In water and wastewater treatment plants, the R911 AS-S911-003 drives high-duty-cycle pump motors and aeration blowers. Its support for fieldbus diagnostics enables predictive maintenance scheduling, reducing unplanned downtime in facilities where continuous operation is a regulatory requirement.

Security & Quality FAQ

Q1: What does the 12-month warranty cover?
The 12-month warranty covers all manufacturing defects and functional failures under normal operating conditions from the date of shipment. If the R911 AS-S911-003 fails due to a component or firmware defect within the warranty period, we will repair or replace the unit at no charge. Physical damage caused by incorrect installation, overvoltage events, or unauthorized modification is excluded. Warranty claims are processed within 5 business days of receiving the returned unit.

Q2: How is each unit tested before shipment?
Every R911 AS-S911-003 module undergoes a multi-stage inspection protocol prior to dispatch: visual inspection for physical damage, power-on functional test verifying communication interface initialization, firmware version confirmation, and output signal integrity check. Units sourced as refurbished are additionally subjected to a 48-hour burn-in cycle under load to screen for latent component failures. A test report is available upon request.

Q3: Is this module compatible with my existing IndraDrive system?
The AS-S911-003 control section is compatible with Bosch Rexroth IndraDrive C (HCS) and IndraDrive M (HMS/HMD) power sections that accept the S911 control section form factor. Compatibility depends on the firmware version loaded on the module and the IndraWorks engineering software version used for parameterization. We recommend providing your existing drive’s type code and firmware version at the time of inquiry so our technical team can confirm compatibility before shipment.

Q4: Can you guarantee long-term supply and replacement support?
Yes. TOPNLMS maintains a dedicated inventory of IndraDrive series components, including the R911 AS-S911-003 and related power sections, control cables, and accessory modules. For customers with planned maintenance schedules or multi-site installations, we offer reserved stock agreements to guarantee availability over a 12–24 month horizon. Our technical support team provides pre-sales compatibility consultation and post-sales commissioning guidance to ensure seamless integration and minimal downtime during replacement.