Overview

The Rexroth VT-VSPA1-1-12 is a state-of-the-art proportional valve amplifier card designed for controlling single-solenoid proportional valves without electrical position feedback. This advanced module processes command signals from a central controller and converts them into precise current levels for the solenoid.

It features internal monitoring circuits that enhance stability and repeatability—crucial factors for maintaining high-quality production cycles in open-loop hydraulic control. Integrating this amplifier enables smoother motion, reduced mechanical wear, and significantly shorter setup times for complex hydraulic profiles. Its robust design and industrial-grade electronics ensure long-term reliability in demanding automation environments.

Technical Data

This amplifier card supports essential control functions including adjustable ramp times, differential input options, and a command-memory function. It also incorporates a precision power output stage to deliver stable solenoid current for accurate pressure or flow control.

Typical Applications

The VT-VSPA1-1-12 is widely employed in automated systems that require smooth, precise proportional control:

• Press brakes – accurate control of ram speed and movement during bending cycles.

• Automated testing/simulation rigs – generation of repeatable pressure or force profiles for reliability testing.

• Single-acting cylinder control – proportional speed control in conveyor tensioning systems or machine tool feeders.

Thus, this amplifier offers an effective, cost-efficient solution for open-loop hydraulic control where full closed-loop accuracy is unnecessary.

❓ Frequently Asked Questions (FAQ)

Q1. What is the primary difference between the VT-VSPA1-1-12 and a closed-loop amplifier?

A1. The VT-VSPA1-1-12 is an open-loop amplifier for valves without electrical position feedback. It controls solenoid current but does not measure actual spool position—reducing cost and system complexity.

Q2. Can this amplifier accept both voltage and current command signals?

A2. Yes. It supports both ±10 V and 4–20 mA command inputs. The input mode is typically selected using jumpers or onboard configuration elements.

Q3. Why is the ramp function important in hydraulic applications?

A3. Ramp control governs how quickly the solenoid current—and therefore flow or pressure—changes. This ensures smooth acceleration and deceleration, prevents hydraulic shock, and extends mechanical component life