Product Description:

Bosch Rexroth Indramat’s VT-SSPA1-150-1X/V0/0-24 is a plug-in proportional amplifier from the VT-SSPA Plugin Proportional Amplifiers series. The card mounts directly onto valve manifolds or inside control cabinets and converts a 24-volt supply into regulated current for solenoid actuation. By translating low-level command signals into controlled coil current, the module enables accurate spool positioning in hydraulic proportional valves used throughout industrial automation and mobile machinery. Its compact form simplifies wiring in demanding plant environments. The single-channel design supports directional or pressure control functions where installation space is limited.

The amplifier operates on a nominal supply of 24 VDC, with an allowable range from 18 to 35 V to accommodate battery or rectified sources. At the rated command, it delivers a coil current of 0.8 A, while the input stage presents 20 kΩ of resistance to minimize the load on upstream analog controllers. Connections for power, command, and feedback are made through four screw terminals. A 1.5 A slow-blow fuse is recommended to protect the supply line. The enclosure carries an IP65 rating, allowing sealed installation in areas exposed to oil spray or dust.

A preset bias current of 100 mA keeps the valve near the threshold of motion, reducing the dead band before the control loop reaches a clock frequency of 150 Hz at maximum current. Stable operation requires a coil inductance of at least 15 mH and cable inductance no greater than 100 µH. The amplifier pairs best with solenoids that have a resistance of 19.5 Ω at 20 °C. Field wiring enters through a PG11 cable gland that provides strain relief and maintains the enclosure seal. Despite its die-cast shell, the module weighs only 0.125 kg, reducing the mechanical load on compact valve manifolds and mounting surfaces.