Product Description:

The VT-SSPA1-508-21/V0 is a plug-in proportional amplifier card manufactured by Bosch Rexroth Indramat for the VT-SSPA Plugin Proportional Amplifiers series. Installed in a standardized rack slot, the module translates command signals from motion controllers into regulated coil current for Rexroth proportional solenoid valves. By providing linear amplification and adjustable ramp generation, it enables precise hydraulic pressure or flow control inside presses, injection machines, and material-handling axes in industrial automation, while its compact board format slides behind a front plate to reduce panel wiring.

The signal input stage presents an impedance of 20 kΩ, so the card draws minimal load from analog controllers and preserves command accuracy across long shielded runs. Internal electronics are powered by a nominal bus of 24 VDC; this level supplies the PWM driver while keeping heat dissipation low. To prevent component overstress, the design tolerates up to 35 V as an absolute supply ceiling. Stable current regulation is maintained when the valve wiring stays below a loop inductance of 100 µH, allowing predictable current changes and fast magnetic response. A molded housing with an IP65 rating shields the circuitry from dust and water jets when the front plate is correctly gasketed against the rack.

Installation is handled through two M3 × 40 mm screws, and the front plate can be indexed in 90° steps to match cabinet layouts. Reliable operation is maintained down to a supply threshold of 18 V, providing headroom for voltage dips in mobile or battery-backed systems. For remote mounting, the driver supports cable runs up to 50 m without losing current control, provided the inductance limit is observed. Coil connections are routed through a plug with 2 + PE contacts, establishing a dedicated protective ground connection for noise suppression. Despite its sealed enclosure, the unit weighs only 0.125 kg, minimizing strain on lightweight aluminum rack frames.