VT-VSPA 1-1-12
The Bosch Rexroth Indramat VT-VSPA 1-1-12 proportional amplifier from the VT-VSPA Proportional Amplifiers series delivers precision current regulation for demanding industrial automation and hydraulic valve control systems. This compact module, weighing 0.17 kg, operates on a nominal +24 V DC (Tolerance: +40% / −5%) supply and accepts input signals for dual-channel control. Featuring robust connectivity via a 32-pole male multipoint connector, DIN 41612 Design D, the VT-VSPA 1-1-12 ensures secure and standardized interfacing within Eurocard-based control cabinets. Its zero adjustment range of ±30% and ramp time settings from 20 ms to 5 s provide fine-tuned response shaping to minimize hydraulic shock.
In terms of detailed specifications, the amplifier adheres to a Euro-card, 100 mm x 160 mm, DIN 41494 form factor for seamless integration. The first control channel supports a single-ended input of 0 to +9 V referenced to M0, while the second channel provides a differential input selectable among 0–10 V, 0–20 mA, and 4–20 mA via integrated DIL switches. A 2.5 A slow-blow fuse protects the unit against overload, while peak current consumption peaks at 1.8 A and overall power consumption remains below 50 VA. The regulated voltage output of ±9 V with ±1% accuracy drives solenoids with selectable current outputs of 800 mA or 1600 mA. Additionally, the amplifier supports clock frequencies of 100 Hz or 160 Hz for high-fidelity current modulation.
Operationally, the VT-VSPA 1-1-12 functions reliably across an ambient temperature range of 0 to +50 °C, making it suitable for indoor factory environments. Ramp time adjustment between 30 ms and approximately 1 s, with an optional 5 s setting, enables smooth actuation profiles and reduces wear on hydraulic components. The module’s power supply voltage range extends from 18 V to 35 V, accommodating moderate fluctuations common in industrial DC bus systems. With a compact mass and standardized connector configuration, the amplifier delivers consistent performance under continuous duty cycles.
Designed for system integrators, the VT-VSPA 1-1-12 interfaces directly with Bosch Rexroth hydraulic valves and PLC-based control architectures. Its DIN-rail compatible Euro-card format simplifies retrofitting into existing racks or new panel builds. Ideal for applications in mobile hydraulics, manufacturing automation, and process control, this amplifier balances precision, robustness, and ease of integration. It is particularly well suited to valve control tasks in assembly lines, injection molding machines, and test stands requiring reliable proportional control.
