Product Description:

The Bosch Rexroth Indramat VT-VSPA1-1-11 is a plug-in proportional amplifier card from the VT-VSPA Proportional Amplifiers series. Installed in a control rack, the board converts low-level command signals into regulated current for proportional or servo-solenoid valves used in hydraulic positioning and pressure regulation loops. Its circuitry offers gain trimming, ramp generation, and differential input isolation, allowing a PLC or motion controller to modulate valve spool position without introducing electrical noise. By conditioning signals directly on the rack backplane, the card reduces external wiring length and supports repeatable flow control in automated machinery.

The board follows the Euro-card layout, giving it standardized edge dimensions of 100 × 160 mm. Connection to the system backplane is through a DIN 41612 Form D interface, and the card carries a 32-pin male header for power, command, and feedback lines. A screened aluminum front panel protects the circuitry and provides test points while maintaining a height of 128.4 mm, so it aligns with adjacent amplifier slots. This arrangement keeps the module compatible with standard rack spacing and preserves consistent connector positioning across neighboring cards.

A time-lag fuse rated at 2.5 A T protects the conductors if a short circuit occurs. Internal power rails draw up to 1.8 A, and total consumption does not exceed 50 VA, which helps limit heat buildup in densely populated racks. The card operates from a 24 V DC supply, and onboard regulators convert that input into stabilized current for the valve coil, which can peak at 1600 mA for large proportional solenoids. With a mass of only 0.1 kg, insertion forces remain low, so the card does not place excessive stress on the backplane sockets in vibration-prone installations.