VT-SSPA1-525-2X/V0/0

The VT-SSPA1-525-2X/V0/0 is a plug-in proportional amplifier module produced by Bosch Rexroth Indramat within the VT-SSPA Plugin Proportional Amplifiers series. The board mounts in a card holder inside a hydraulic control enclosure and conditions drive signals for one proportional solenoid. By converting a low-power voltage reference into a regulated current, it allows industrial controllers to adjust hydraulic pressure or flow smoothly rather than in steps. This operation supports machinery that requires accurate and repeatable force or speed profiles.

Its power electronics operate from a nominal supply of 24 V DC, so the card can be powered directly by common control power supplies without additional conversion. The command channel accepts a differential reference of 0 to 10 V. Across this range, the internal circuit generates a linear output that reaches a rated coil current of 2.5 A. The card has one solenoid channel and is suitable for single-stage valves such as the DBETX-1X and DBE6X families. The reference path uses an analog signal, and the module operates with no position feedback. It relies on the proportional response of the hydraulic element itself. When used with valves from the 3(2)FREX-1X-25… group, this open-loop arrangement provides stable flow control while keeping the wiring simple.

The module weighs 0.23 kg, allowing it to fit in densely populated racks without overloading the card guides. Field wiring enters through a sealed cable gland, which provides strain relief and basic moisture protection for the supply, command, and solenoid leads. The module is intended for hydraulic manifolds that use proportional valves. Its low mass helps reduce vibration transfer within the mounting assembly. Accessible test points correspond directly to the commanded voltage, simplifying checks of the current loop and connected valve response. Thermal energy is dissipated through the plated copper on the card, so no additional heat sink hardware is required during normal operation.