The REXROTH VT11131-12 is a high-performance analogue amplifier module designed by Bosch Rexroth for the precise control of proportional pressure control valves. This Eurocard-format module converts standardized input signals into a pulse-width modulated (PWM) current, ensuring accurate and repeatable hydraulic performance in industrial machinery.
Product Overview
The VT11131-12 is engineered to drive proportional valves without electrical position feedback. It functions as a current regulator, compensating for fluctuations in supply voltage and changes in solenoid coil resistance due to temperature shifts. By utilizing a high-frequency dither signal, the module reduces the breakaway forces and hysteresis of the hydraulic valve, providing smooth and linear control of hydraulic pressure or flow.
Technical Datasheet & Parameters
| Parameter | Specification |
| Model Number | VT11131-12 |
| Manufacturer | Bosch Rexroth |
| Operating Voltage | 24V DC (+20% / -10%) |
| Power Consumption | Max 50 VA |
| Command Value (Input) | 0 to +10V or 0 to +20mA (Configurable) |
| Output Current | 0 to 800mA or 0 to 1.6A (Model Dependent) |
| Dither Frequency | 100 Hz to 200 Hz (Adjustable) |
| Ramp Time | 0.03s to 5s (Adjustable via Potentiometer) |
| Format | Eurocard 100 x 160 mm |
| Connection Type | 32-pin Plug-in Connector (DIN 41612) |
Country of Origin
The REXROTH VT11131-12 is designed and manufactured in Germany.
Application Fields
- Plastic Injection Molding: Precise clamping and injection pressure control.
- Hydraulic Presses: Managing the force profiles during metal forming and stamping.
- Machine Tools: Controlling tool feed rates and hydraulic clamping pressures.
- Foundry Machinery: Driving proportional valves in high-heat, high-cycle environments.
- Civil Engineering: Operating large hydraulic actuators for dam gates or bridge mechanisms.
Technical Description
Technically, the VT11131-12 features a differential input stage that accepts various command value signals. It incorporates an internal ramp generator that can be adjusted to limit the rate of change of the output signal, preventing hydraulic shocks. The output stage operates as a switching power amplifier (PWM), which minimizes heat dissipation within the module. Integrated protection circuits guard against short circuits in the solenoid cable and provide an “OK” status signal via a front-panel LED when the system is operating within defined parameters.
Usage Instructions
- Mounting: Slide the Eurocard module into a 19-inch rack or a single-card holder. Ensure the 32-pin connector is properly aligned before seating.
- Power Supply: Connect a stabilized 24V DC power source. Ensure the polarity is correct to avoid triggering the internal protective fuse.
- Signal Calibration: Use the front-panel “Zero” potentiometer to calibrate the valve’s cracking point and the “Gain” potentiometer to set the maximum hydraulic output relative to the 10V/20mA input.
- Ramp Adjustment: Turn the ramp potentiometers (clockwise to increase) to smooth out the valve transition and reduce mechanical vibration in the hydraulic lines.
- Wiring: Use shielded cables for the command value input to minimize the impact of electromagnetic interference (EMI) from nearby motors or power lines.
For technical documentation and stock availability of the VT11131-12 and other Rexroth amplifiers, please visit our online parts resource.
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