Bosch Rexroth VT-VSPD Series Proportional Valve Amplifier Cards: VT-VSPD-1-22/V0/0-0-1

Technical Dossier

Product Details And Specifications

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

The Bosch Rexroth VT-VSPD series represents a standardized family of digital proportional valve amplifier cards engineered for closed-loop electrohydraulic control in heavy industrial environments. These cards are deployed across global process industries including petrochemical refineries, nuclear power auxiliary systems, offshore platforms, steel rolling mills, and large-scale chemical processing plants. The VT-VSPD platform replaced earlier analog amplifier generations (VT-VSPA, VT-VSPH) and introduced onboard digital signal processing, enabling precise ramp control, enable logic, and fault diagnostics without external PLC intervention. Installed base spans hundreds of thousands of units across OEM hydraulic press systems, injection molding machines, and turbine governor actuators. The VT-VSPD-1-22/V0/0-0-1 is a single-axis, 24 VDC supply variant with ±10 V command input, designed for direct DIN-rail or rack mounting in Rexroth VT 3000 and VT 5000 series control cabinets.

The Evolution of VT-VSPD Architecture

Bosch Rexroth's proportional valve amplifier lineage began with fully analog boards in the VT-VSPA and VT-VSPH families, which relied on discrete op-amp circuits for ramp generation and dither injection. These were succeeded in the mid-1990s by the VT-VSPD platform, which introduced a microcontroller-based architecture with EEPROM parameter storage, replacing potentiometer-based tuning with digital parameter assignment via RS-232 or the Rexroth VT-COM interface. The VT-VSPD-1 sub-family targets single-solenoid proportional directional and pressure valves; the VT-VSPD-2 sub-family addresses dual-solenoid configurations. Suffix codes encode supply voltage range (22 = 24 VDC nominal), hardware revision (V0), and feature set (0-0-1 = standard enable, no fieldbus, single channel). Later revisions introduced PROFIBUS-DP and CANopen fieldbus options (suffix -1-0-1 and -2-0-1 respectively), enabling direct integration with Siemens S7 and Allen-Bradley ControlLogix PLCs without analog I/O cards. The current generation successor is the Rexroth VT-HACD series, which consolidates amplifier and motion controller functions on a single card with EtherCAT connectivity. However, the VT-VSPD remains the dominant installed base card in pre-2015 hydraulic systems, and direct replacement with VT-HACD requires solenoid driver reconfiguration and PLC program modification, making like-for-like VT-VSPD sparing the preferred maintenance strategy for most end users.

VT-VSPD Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Bosch Rexroth VT-VSPD series. Each entry reflects a distinct hardware configuration. Substitution between variants requires engineering review.

VT-VSPD-1-22/V0/0-0-1: Single-axis, 24 VDC, ±10 V analog input, standard enable, no fieldbus, DIN-rail mount.
VT-VSPD-1-22/V0/1-0-1: Single-axis, 24 VDC, with integrated ramp generator and extended enable logic.
VT-VSPD-1-22/V0/0-1-1: Single-axis, 24 VDC, PROFIBUS-DP fieldbus interface, single solenoid output.
VT-VSPD-1-22/V0/0-2-1: Single-axis, 24 VDC, CANopen fieldbus interface, single solenoid output.
VT-VSPD-1-22/V0/0-0-2: Single-axis, 24 VDC, dual enable inputs, enhanced fault relay output.
VT-VSPD-2-22/V0/0-0-1: Dual-axis, 24 VDC, ±10 V analog input, dual solenoid proportional directional valve control.
VT-VSPD-2-22/V0/0-1-1: Dual-axis, 24 VDC, PROFIBUS-DP, dual solenoid output with independent ramp channels.
VT-VSPD-2-22/V0/0-2-1: Dual-axis, 24 VDC, CANopen, dual solenoid output.
VT-VSPD-1-22/V0/1-1-1: Single-axis, 24 VDC, PROFIBUS-DP, extended ramp and enable logic.
VT-VSPD-1-22/V0/1-2-1: Single-axis, 24 VDC, CANopen, extended ramp and enable logic.
VT-VSPD-1-22/V1/0-0-1: Single-axis, hardware revision V1, 24 VDC, updated EEPROM parameter map.
VT-VSPD-1-22/V1/0-1-1: Single-axis, hardware revision V1, PROFIBUS-DP, updated diagnostics register.
VT-VSPD-2-22/V1/0-0-1: Dual-axis, hardware revision V1, 24 VDC, dual solenoid, updated firmware.
VT-VSPD-1-22/V0/0-0-1-10: Single-axis, 24 VDC, extended temperature range (-20°C to +70°C), for outdoor cabinet use.
VT-VSPD-1-22/V0/0-0-1-EX: Single-axis, 24 VDC, ATEX-rated variant for Zone 2 hazardous area installation.
VT-VSPD-2-22/V0/1-0-1: Dual-axis, 24 VDC, extended ramp generator, dual solenoid, no fieldbus.
VT-VSPD-1-22/V0/0-3-1: Single-axis, 24 VDC, DeviceNet fieldbus interface, single solenoid output.

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

Bosch Rexroth has progressively transitioned VT-VSPD production to end-of-life status as the VT-HACD and VT-MSPA2 platforms are promoted as modern replacements. For facilities operating pre-2015 hydraulic systems — particularly those with long planned maintenance intervals (turnarounds every 3–5 years) — maintaining a VT-VSPD spare parts buffer is operationally critical. DriveKNMS maintains a dedicated inventory of VT-VSPD series cards sourced from decommissioned OEM equipment, authorized surplus channels, and factory-sealed new-old-stock (NOS). All units are catalogued by hardware revision and firmware version to ensure compatibility with the target system's backplane and solenoid driver specifications. For obsolete suffix variants no longer listed in Rexroth's current price book, DriveKNMS provides cross-reference verification against the original system's wiring diagram and parameter sheet before shipment. Customers operating in regulated industries (nuclear, offshore, pharmaceutical) can request full traceability documentation including country of origin, inspection records, and functional test reports.

Quality Control for the VT-VSPD Range

VT-VSPD cards incorporate a multi-layer PCB with surface-mount power driver ICs, precision analog front-end circuitry, and an onboard microcontroller. The failure modes specific to this series include: solenoid driver MOSFET degradation due to inductive load switching, EEPROM parameter corruption from power transients, and RS-232 interface IC failure from ESD events during field parameterization. DriveKNMS applies a structured test protocol for all VT-VSPD units prior to dispatch: (1) Visual inspection of PCB for corrosion, burnt components, and solder joint integrity under 10× magnification. (2) Power-on functional test at 24 VDC nominal with current-limited bench supply, verifying enable relay operation and fault LED behavior. (3) Analog command sweep test: ±10 V input applied via calibrated signal generator, solenoid output current measured across full command range against Rexroth factory specification (typically 0–800 mA or 0–1600 mA depending on variant). (4) Ramp function verification: ramp-up and ramp-down times set to minimum and maximum values, output response recorded. (5) EEPROM parameter read-back via VT-COM software to confirm parameter integrity. (6) 4-hour burn-in at elevated ambient temperature (50°C) to screen early-life failures. Units that fail any stage are quarantined and not returned to serviceable stock.