Bosch Rexroth VT-HACD Series Modules: VT-HACD-1-14/V0/1-0-0 R900745354 Control Board –

Technical Dossier

Product Details And Specifications

Bosch Rexroth VT-HACD Series: Comprehensive Module Range and Technical Overview

The Bosch Rexroth VT-HACD series (Hydraulic Axis Control Drive) represents a dedicated family of analog and digital axis control cards engineered for closed-loop electrohydraulic motion control. These modules are embedded in mission-critical installations across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, offshore platforms, steel rolling mills, and large-scale chemical processing plants. The VT-HACD platform interfaces directly with Rexroth proportional valves and servo valves, providing position, velocity, and force control via integrated PID algorithms. Its long production lifecycle and widespread OEM adoption mean that VT-HACD modules remain active in installed bases that span multiple decades of industrial infrastructure.

The Evolution of VT-HACD Architecture

The VT-HACD series emerged from Rexroth's earlier VT-SR and VT-VHS analog amplifier card families, transitioning toward integrated axis control functionality on a single eurocard-format PCB. Early variants operated on pure analog signal chains with external setpoint inputs (±10 V), manual potentiometer-based gain adjustment, and discrete enable/disable logic. Mid-generation revisions introduced onboard EEPROM parameter storage, digital status outputs, and improved EMC shielding to meet IEC 61000 industrial immunity standards.

Later hardware revisions (V0, V1 suffix designations) incorporated revised op-amp topologies for improved thermal stability and reduced offset drift, critical for hydraulic systems requiring sub-millimeter positional repeatability. The R9007xxxxx material number system (Rexroth's internal BOM reference) allows precise identification of PCB revision and component population variant. Compatibility between hardware revisions is generally maintained at the connector and parameter level, but firmware-dependent variants must be matched to the corresponding amplifier electronics (VT-VSPA, VT-HACD-DFE) when used in digital fieldbus configurations. For systems migrating from VT-HACD to current-generation Rexroth BODAS or IndraControl platforms, signal conditioning adapters and parameter migration tools are required.

VT-HACD Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Bosch Rexroth VT-HACD series. Each entry reflects a distinct hardware configuration or revision level.

Axis Control Cards – Single Axis:

• VT-HACD-1-14/V0/1-0-0 R900745354: Single-axis hydraulic control card, ±10 V command input, integrated PID, 14-pin eurocard format, hardware revision V0.
• VT-HACD-1-14/V1/1-0-0 R900745355: Single-axis control card, V1 PCB revision with improved EMC filtering and revised gain network.
• VT-HACD-1-1X/V0/1-0-0 R900724685: Single-axis variant with extended input voltage range, compatible with ±10 V and 0–10 V setpoint sources.
• VT-HACD-1-1X/V1/1-0-0 R900724686: Updated V1 revision of the extended-range single-axis card.
• VT-HACD-1-14/V0/0-0-0 R900703421: Base configuration single-axis card without enable output relay, for legacy panel integration.

Axis Control Cards – Dual Axis:

• VT-HACD-2-14/V0/1-0-0 R900745360: Dual-axis hydraulic control card, independent PID loops per axis, shared power supply rail.
• VT-HACD-2-14/V1/1-0-0 R900745361: V1 revision dual-axis card with revised output stage for improved valve current linearity.
• VT-HACD-2-1X/V0/1-0-0 R900724690: Dual-axis extended-range variant, supports mixed valve configurations per axis.

Axis Control Cards – With Digital Interface (DFE Option):

• VT-HACD-1-14/DFE/V0/1-0-0 R900778210: Single-axis card with integrated PROFIBUS-DP digital fieldbus interface for parameter upload/download.
• VT-HACD-2-14/DFE/V0/1-0-0 R900778215: Dual-axis card with PROFIBUS-DP interface, enables remote diagnostics and setpoint transmission.
• VT-HACD-1-14/DFE/V1/1-0-0 R900778211: V1 revision single-axis DFE card with updated fieldbus stack firmware.

Associated Amplifier and Power Supply Modules:

• VT-VSPA2-1-1X/V0/T1 R900785786: Proportional valve amplifier card, direct companion module for VT-HACD axis cards in multi-axis racks.
• VT-VSPA2-2-1X/V0/T1 R900785787: Dual-channel proportional amplifier, used in tandem with VT-HACD-2 series cards.
• VT-NE31-1X/V0/0-0 R900785900: Rack power supply module for VT series eurocard systems, 24 VDC input, regulated ±15 V output.
• VT-SWMO-1-1X/V0/0-0 R900724700: Ramp and mode selection module, used alongside VT-HACD cards for velocity profile shaping.

Sourcing Hard-to-Find & Obsolete VT-HACD Parts

The VT-HACD series has entered the mature-to-end-of-life phase of its product lifecycle. Bosch Rexroth has progressively discontinued active production of individual card variants, with replacement recommended toward the current VT-HACD-DFE and IndraControl XM platforms. However, the installed base of VT-HACD hardware in long-lifecycle industrial plants (refineries, power stations, and continuous process facilities with 20–40 year equipment horizons) creates sustained demand for original spare parts and tested replacement units.

DriveKNMS maintains a dedicated inventory program for obsolete and hard-to-source Rexroth VT-HACD modules. Our sourcing network covers original new-old-stock (NOS) units, factory-refurbished cards, and tested-used modules with full functional verification. For facilities requiring long-term maintenance agreements or multi-year spare parts kits for VT-HACD-equipped hydraulic systems, DriveKNMS provides structured procurement support including cross-reference to compatible successor modules where direct replacements are unavailable.

Quality Control for the VT-HACD Range

VT-HACD axis control cards present specific test challenges due to their analog signal chain architecture, multi-layer PCB construction, and sensitivity to component aging in electrolytic capacitors and precision resistor networks. DriveKNMS applies a structured test protocol to all VT-HACD units prior to dispatch:

• Visual and mechanical inspection: PCB trace integrity, connector pin condition, potentiometer mechanical function, and component identification against known-good reference boards.
• Power-on functional test: Applied to a calibrated test rack replicating the original VT series backplane, verifying regulated supply rails (±15 V, +5 V) and absence of fault outputs at startup.
• PID loop verification: Closed-loop step response test using a simulated valve load, confirming proportional, integral, and derivative gain response within Rexroth factory specification bands.
• Setpoint linearity test: ±10 V input sweep with output current measurement at 10% increments, verifying linearity error within ±0.5% full scale.
• Enable/disable logic test: Verification of enable input response time and output relay switching under load.
• Thermal soak: 2-hour operation at 45°C ambient to screen for latent thermal-related failures in aging components.

All test results are documented and available upon request for critical spare part orders.