Bosch Rexroth VT3000-3X – Analog Amplifier Card for Proportional Valves

The Bosch Rexroth VT3000-3X is an analog amplifier card designed to drive proportional valve solenoids with stable current control, smooth ramps, and adjustable dither. From my experience, it’s a practical choice when you want reliable, repeatable motion or pressure control without the complexity of a full-blown PLC-based motion system. It sits in a Eurocard rack, accepts standard analog command signals (voltage or current), and provides a clean current output to Rexroth proportional valves used on hydraulic manifolds, power units, and test stands.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: Typically 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Stable current control for proportional valves: Provides a regulated solenoid current to keep valve behavior consistent, even with supply fluctuations.
• Standard analog command inputs: Typically accepts 0…±10 V or 0/4…20 mA, making retrofits straightforward.
• Adjustable ramp and dither: You can tune response speed and reduce stick-slip; helpful on precision motion or low-flow applications.
• Eurocard format: 100 × 160 mm card fits standard 19-inch racks with DIN 41612 connectors for tidy panel builds.
• Robust industrial design: In many cases, runs reliably in shop-floor environments where PLC slot I/O isn’t practical.
• Service-friendly test points: You might notice convenient points for measuring command and current—handy during commissioning.

Technical Specifications

Where it typically fits

Commonly used with Rexroth proportional directional and pressure valves on hydraulic presses, injection molding machines, steel processing lines, and compact HPU skids. One thing I appreciate is how quickly it commissions—set the input mode, dial in ramp and dither, and you usually get a smooth, predictable response without chasing parameters for hours.

Related or Supporting Products

• Rexroth VT 3002-1X card holder / 19″ rack: The standard rack/backplane for VT-series amplifier cards (DIN 41612 connectors).
• Rexroth VT 5010-3X: Newer-generation amplifier with extended adjustment range; useful when finer signal conditioning is needed.
• Rexroth VT-MSPA1 / VT-VSPA1 series: Compact valve drivers for single-solenoid applications where panel space is limited.
• Rexroth proportional valves (e.g., 4WRA / 4WRZ series): Widely paired with VT3000-3X for directional and pressure control without LVDT feedback.
• 24 V DC industrial power supply (e.g., 10–20 A): Ensures clean supply headroom for multiple amplifier cards and solenoid loads.

Installation & Maintenance

• Cabinet & rack: Mount in a 19″ enclosure with the proper VT 3002 rack. Provide ventilation; keep ambient within 0…+50 °C.
• Wiring: Use shielded twisted pairs for analog commands. Ground shields at one point only to avoid ground loops. Size solenoid leads for expected current.
• Power quality: 24 V DC with low ripple. In most cases, adding a dedicated 24 V supply and proper grounding reduces noise and drift.
• Setup: Select input type (V or mA), then adjust gain, ramp up/down, and dither. Verify with a multimeter at test points before putting the machine under load.
• Safety: De-energize the system before inserting/removing cards. Confirm the solenoid’s rated current to prevent overheating.
• Routine maintenance: Quarterly check of terminal tightness, dust cleaning, and a quick function test. Analog hardware means no firmware updates; keep a record of knob settings for traceability.
• Troubleshooting tip: If the valve “sticks” at low flows, a slight increase in dither frequency or amplitude often helps—within valve manufacturer limits.

Quality & Certifications

• Compliance: CE compliant; RoHS alignment for electronic assemblies (it appears that most VT-series cards meet current directives).
• Quality system: Manufactured under ISO 9001 quality management.
• Warranty: 365 days from shipment (replacement or repair, subject to evaluation).

If you’re modernizing a hydraulic manifold or need a straightforward way to drive a Rexroth proportional valve, the VT3000-3X strikes a good balance between simplicity and control. It typically drops into existing Eurocard racks, so changeover is quick and low-risk.