Product Description:

The VT-VSPA1-1-13 proportional amplifier is produced by Bosch Rexroth Indramat within the VT-VSPA Proportional Amplifiers series. Installed in control cabinets, the card conditions command signals and drives proportional solenoid valves so hydraulic flow or pressure can be set from an analog reference. It converts low-level voltages from a PLC or joystick into regulated coil current, forming the interface between electronic controls and fluid power actuators in industrial automation.

This amplifier runs from an input of 24 VDC, with an operating window bounded by 22 V at the low end and a maximum of 35 V. Under full load, the board draws up to 1.8 A or 50 VA from the supply, while the output stage can supply a peak solenoid current of 1.6 A. Because the circuit is analog, command signals are processed continuously, the ±9 V regulated rail stabilizes the internal electronics, and a 25 mA regulated output current is available for external transducers. A command monitor accepts a 6 V full-scale reference, and the current monitor provides 1 mV for every milliamp flowing to the valve, allowing the host controller to verify coil excitation without additional sensors.

The module occupies a Eurocard footprint of 100 × 160 mm, and its front plate rises 128.4 mm to match standard rack heights. Electrical terminations are made through a 32-Pin DIN 41612 Form D connector so the card can slide into VT-3000 or similar subracks without field wiring. Overcurrent protection is handled by a front-accessible 2.5 A Slow-Blow fuse that trips only after sustained faults, maintaining service continuity during brief transients. With a mass of just 0.1 kg, the board adds negligible load to cantilevered card guides and allows rapid exchange during maintenance. The compact format helps the module fit standard hydraulic control racks and card-guided enclosures used in industrial automation.