Bosch Rexroth VT-5006 Amplifier Modules: VT5006S12, VT5006S12R5

Technical Dossier

Product Details And Specifications

Bosch Rexroth VT-5006 Series: Comprehensive Module Range and Technical Overview

The Bosch Rexroth VT-5006 is a single-axis proportional valve amplifier card designed for use with Rexroth 4/3 and 4/2 directional proportional valves. It has been deployed across heavy industrial sectors including petrochemical refining, nuclear power auxiliary systems, offshore hydraulic control platforms, and steel mill press lines. The card operates within the Rexroth VT analog amplifier ecosystem, providing closed-loop current control for proportional solenoids. Its DIN rail-compatible form factor and standardized 24 VDC supply voltage made it a default specification in hydraulic motion control panels throughout the 1990s and 2000s. Installed base remains high in facilities with long equipment lifecycles, making spare part availability a critical operational concern.

The Evolution of VT-5006 Architecture

The VT-5006 belongs to Rexroth's first-generation analog proportional amplifier family, which preceded the VT-HACD and VT-VSPA2 digital amplifier platforms. Early variants (VT5006S1x) used discrete analog circuitry with manual potentiometer adjustment for zero offset, gain, ramp time, and dither frequency. The S12 designation indicates the 12 V solenoid current output variant, while R5 denotes a revision level with improved EMC filtering and revised PCB layout for reduced thermal drift.

Compatibility constraints are significant: VT-5006 cards are not interchangeable with VT-5010 or VT-5035 series without valve-side parameter re-commissioning. The card communicates via analog ±10 V command signal and does not support fieldbus protocols (PROFIBUS, CANopen, EtherCAT), which defines its integration boundary in modern PLC architectures. Facilities migrating to Rexroth Sytronix or IndraMotion platforms must treat VT-5006 as a terminal-generation component requiring lifecycle management rather than upgrade path integration.

VT-5006 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented VT-5006 series production range. Each unit is a single-axis proportional amplifier card unless otherwise noted.

VT5006S12: Single-axis amplifier, 12 V solenoid output, ±10 V command input, DIN rail mount
VT5006S12R5: Revision 5 of VT5006S12; improved EMC filter, reduced thermal drift on gain stage
VT5006S24: 24 V solenoid output variant; used with higher-resistance solenoid coils
VT5006S24R3: Revision 3 of VT5006S24; updated ramp generator circuit
VT5006S12R3: Intermediate revision; transitional PCB between R1 and R5 production runs
VT5006S12R1: Original production release of the S12 variant; earliest field-deployed version
VT5006-1X/V0/0-0-0: Catalog ordering code format; base configuration, no enable input, standard ramp
VT5006-1X/V0/1-0-0: Enable input active; used in safety-interlock hydraulic circuits
VT5006-1X/V0/0-1-0: Integrated ramp generator with external ramp time adjustment
VT5006-1X/V0/0-0-1: Dither frequency externally adjustable via potentiometer
VT5006-1X/V0/1-1-0: Enable input + ramp generator combined configuration
VT5006-1X/V0/1-1-1: Full-option variant; enable, ramp, and dither all active
VT5006S12-1X: Generation index suffix indicating second production generation tooling
VT5006S24-1X: 24 V second-generation production variant
VT5006S12R5-1X: R5 revision with 1X generation tooling; latest known production configuration

Sourcing Hard-to-Find & Obsolete VT-5006 Parts

Bosch Rexroth has transitioned the VT-5006 series to end-of-life status. OEM new stock is no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory of tested surplus and refurbished VT-5006 amplifier cards sourced from decommissioned hydraulic control panels, OEM overstock, and controlled disassembly of retired industrial equipment.

For facilities operating legacy Rexroth proportional hydraulic systems, DriveKNMS provides: verified cross-reference matching between ordering code variants, functional equivalence assessment between revision levels (R1 through R5), and documented test records for each unit shipped. Lead times for low-volume requirements (1–5 units) are typically 3–7 business days from stock confirmation. For volume requirements supporting planned maintenance shutdowns, advance reservation is available upon purchase order submission.

Quality Control for the VT-5006 Range

Each VT-5006 unit processed by DriveKNMS undergoes a structured test protocol specific to analog proportional amplifier cards:

Power supply verification: 24 VDC input rail checked for correct regulation and inrush current behavior.
Solenoid output current calibration: Output current measured at 0%, 50%, and 100% command signal against factory specification (typically 0–800 mA for S12 variant).
Zero offset and gain potentiometer function: All accessible trim pots verified for full range of travel and stable output response.
Ramp generator timing: Ramp-up and ramp-down times measured against specification window using calibrated signal generator input.
Dither superimposition: Dither amplitude and frequency verified at solenoid output terminals.
Enable input logic: Where fitted, enable input tested for correct inhibit and release behavior.
Thermal soak: Cards operated at rated load for minimum 30 minutes; output stability monitored for drift exceeding ±2% of full scale.
Insulation resistance: Output terminals to chassis ground checked at 500 VDC.

Test data is retained per unit serial number and available upon request for quality audit purposes.