Rexroth VT3006S35-R1 – Analog Amplifier Card for Proportional Directional Valve Control | VT3006 Series
Engineering Background
The Bosch Rexroth VT3006 series represents a mature, field-proven analog amplifier platform engineered specifically for proportional directional control valves in demanding industrial hydraulic systems. Developed to meet the rigorous requirements of closed-loop and open-loop hydraulic motion control, the VT3006S35-R1 has accumulated decades of deployment across heavy machinery, press systems, injection molding, and marine hydraulics worldwide.
Product Positioning
The VT3006S35-R1 is the preferred drop-in amplifier card for engineers maintaining or upgrading legacy Rexroth proportional valve installations. It delivers stable, noise-immune analog signal conditioning without requiring migration to digital fieldbus architectures — making it the cost-effective choice for brownfield projects where proven reliability outweighs feature expansion.
Complete Technical Specifications
| Part Number | VT3006S35-R1 |
| Manufacturer | Bosch Rexroth AG |
| Series | VT3006 |
| Card Type | Analog Amplifier Card |
| Compatible Valves | Rexroth 4WRE / 4WRKE / 4WRPEH proportional directional valves |
| Supply Voltage | 24 VDC (±15% tolerance) |
| Output Current | Up to 2.5 A (solenoid drive) |
| Command Signal Input | ±10 VDC differential analog |
| Enable Input | 24 VDC digital enable signal |
| Ramp Function | Adjustable ramp-up / ramp-down (independent) |
| Dither Frequency | Adjustable (typ. 50–200 Hz) |
| Dither Amplitude | Adjustable via onboard potentiometer |
| Zero Offset Adjustment | Onboard potentiometer |
| Gain Adjustment | Onboard potentiometer |
| Mounting Format | DIN rail / sub-rack card format |
| Operating Temperature | 0 °C to +50 °C |
| Storage Temperature | -25 °C to +70 °C |
| Protection Class | IP20 (card-level) |
| Weight | Approx. 8.8 kg (packaged) |
| Approvals | CE marked; RoHS compliant |
Proven Application Environments
- Hydraulic Press & Forging: Precise ram velocity and force control via proportional directional valves; ramp functions prevent pressure spikes on reversal.
- Injection Molding Machines: Clamp and injection axis control requiring smooth, repeatable analog command following.
- Marine & Offshore Hydraulics: Steering gear, stabilizer fin, and hatch actuator systems where analog reliability is mandated over fieldbus dependency.
- Steel Mill & Rolling Equipment: Roll gap and tension control loops with high-cycle duty requirements.
- Mobile Machinery: Crane, excavator, and drilling rig hydraulic circuits requiring robust EMI-immune amplifier cards.
- Test Bench & Simulation Rigs: Servo-hydraulic test systems where analog command fidelity is critical for data integrity.
Engineering Advantages
- True Analog Architecture: No firmware dependencies, no fieldbus configuration — commissioning is purely hardware-based via onboard potentiometers, reducing setup time and eliminating software compatibility risks.
- Independent Ramp Control: Separate ramp-up and ramp-down adjustments allow fine-tuning of actuator acceleration and deceleration profiles without affecting steady-state gain.
- Dither Optimization: Adjustable dither frequency and amplitude minimize valve hysteresis and static friction effects, extending valve service life and improving positioning repeatability.
- Differential Command Input: ±10 VDC differential input rejects common-mode noise from long cable runs in industrial environments.
- Direct OEM Replacement: Pin-compatible with existing VT3006 installations — no wiring modifications required for like-for-like replacement.
- Proven MTBF: Rexroth VT3006 series cards are documented in service for 15+ years in continuous-duty applications.
System Architecture & Signal Flow
The VT3006S35-R1 operates as a standalone analog signal conditioner and solenoid driver within a proportional valve control loop:
- Command Input Stage: Differential ±10 VDC analog command received from PLC analog output or motion controller.
- Ramp Generator: Command signal passed through independent ramp-up/ramp-down generator to limit slew rate and protect mechanical components.
- Zero & Gain Conditioning: Onboard potentiometers trim zero offset and scale gain to match valve flow characteristic.
- Dither Superimposition: High-frequency dither signal superimposed on command to overcome valve spool static friction.
- Current Driver Stage: Conditioned signal converted to proportional solenoid drive current (up to 2.5 A) with short-circuit protection.
- Enable Logic: 24 VDC digital enable input gates solenoid output — safe de-energization on enable loss.
Sourcing & Quality Verification
Konmask.com sources the VT3006S35-R1 exclusively through verified industrial surplus channels and authorized regional distributors. Every unit undergoes the following pre-shipment verification protocol:
- Visual inspection: PCB condition, connector integrity, potentiometer function, label legibility
- Part number and date code cross-reference against Rexroth documentation
- Functional bench test: supply voltage application, enable signal verification, output current measurement
- Anti-static packaging with humidity indicator card
- Shipment with inspection report on request
Counterfeit risk mitigation: All units are sourced with traceable chain-of-custody documentation. We do not source from unverified secondary markets.
Procurement Process
- Inquiry: Submit your part number, required quantity, and delivery timeline via email or the product page inquiry form.
- Stock Confirmation: Konmask confirms availability and provides a formal quotation within 1 business day.
- Order Placement: Purchase order or online checkout accepted. Proforma invoice issued for wire transfer orders.
- Quality Check & Dispatch: Unit inspected, packed, and dispatched within 2–5 business days. DHL / FedEx / SF Express available.
- After-Sales Support: Technical commissioning support available via email. Warranty claims handled within 7 business days of receipt.
Technical FAQ
Q: Is the VT3006S35-R1 compatible with 4WRKE series valves?
A: Yes. The VT3006S35-R1 is designed for use with Rexroth 4WRE, 4WRKE, and 4WRPEH proportional directional valves. Verify solenoid coil resistance and current rating against the card’s output specification before installation.
Q: Can this card be used with a ±10 V PLC analog output?
A: Yes. The differential ±10 VDC command input is directly compatible with standard PLC analog output modules. Ensure the PLC output is differential or use a signal isolator for single-ended sources in noisy environments.
Q: What is the difference between VT3006S35-R1 and VT3006S36-R1?
A: The suffix digit (35 vs 36) denotes the output current range and valve compatibility variant. Confirm your valve’s solenoid specification against the Rexroth VT3006 datasheet (RE 30028) before ordering.
Q: Do you provide the Rexroth RE 30028 datasheet?
A: Yes. The official Rexroth RE 30028 datasheet is available upon request. Contact support@konmask.com.
Q: What warranty is provided?
A: Konmask provides a 90-day functional warranty covering verified manufacturing defects. Warranty does not cover damage from incorrect installation, overvoltage, or reverse polarity.
Q: Can you supply multiple units for a plant-wide spare parts program?
A: Yes. Volume pricing is available for orders of 3+ units. Contact us for a tailored quotation.
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