Product Description:

The VT-SSPA1-50-10/V0/0-24 plug-in proportional amplifier is produced by Bosch Rexroth Indramat within the VT-SSPA Plugin Proportional Amplifiers series. Designed for direct mounting near hydraulic valves, it converts low-level command voltages from a PLC into regulated coil current so that flow or pressure actuators respond with predictable force. By closing the loop between electronic control and hydraulic motion, the board supports presses, plastic injection machines, and other automated equipment that require repeatable positioning under variable loads.

The internal electronics operate from a 24 VDC supply, and the board tolerates a range from 18 V to 35 V so cabinet power variations do not interrupt operation. A PWM carrier frequency of 305 Hz helps maintain linear magnetic force while reducing audible noise. The drive provides a nominal coil current of 2.5 A through a power stage connected to a command input with 20 kΩ of resistance. Overcurrent events are limited by a field-replaceable 3.15 A slow-blow fuse that opens the circuit when fault energy exceeds safe limits. The output supports many NG6 and NG10 proportional solenoids. Connected coils must have at least 10 mH of inductance, while output line inductance must not exceed 100 µH.

Factory calibration provides a baseline output of 100 mA, allowing small pilot valves to respond without external adjustment. When installed in washdown areas, the sealed housing achieves an IP65 ingress protection rating after the four screw terminals and the 4 × 1.5 mm² shielded cable are secured beneath the gasketed cover. The components tolerate storage temperatures from -25 °C to 85 °C, allowing the amplifier to remain unpowered in a broad range of storage conditions. Its overall mass is 0.125 kg, so the unit adds little load to its mounting surface. The screw-terminal connections also provide direct access for power, command, and output wiring.