Product Description:

The VT-MSPA1-50-1X-V001 is a pulse-width modulated solenoid amplifier that belongs to the VT-MSPA Drives series from Bosch Rexroth Indramat. The module converts a low-voltage DC supply into a current-controlled pulse output for proportional hydraulic valves, allowing repeatable positioning of spools and actuators in automated machinery. Mounted close to the valve stack, it bridges control electronics and fluid power elements so that PLC analog commands are translated into stable magnetic force on the associated solenoids. Because the output is current-controlled, the amplifier can compensate for normal coil variation more effectively than a simple voltage-fed driver. It is suited to proportional functions such as pressure, flow, or directional control where repeatable coil actuation is important.

The amplifier is optimized for a nominal supply of 24 VDC, yet it tolerates input excursions down to 21 V and up to 35 V without losing regulation. Under full load it draws a maximum of 2 A, and its internal power demand is limited to 50 VA, which simplifies cabinet fusing and power budgeting. For proportional actuators, the output stage can deliver up to 2.5 A of solenoid current and is matched to a coil resistance of 2 Ω at 20 °C so magnetic force remains linear. A factory-set carrier frequency of 360 Hz ±15% minimizes valve chatter while keeping core losses low. Stable PWM control also helps the connected valve hold intermediate spool positions during changing operating conditions. The electronics remain functional at ambient temperatures up to 50 °C, supporting use in typical industrial enclosures.

Physical integration is aided by the IP20 open-frame housing that clips onto a DIN 50022 NS 35/7.5 rail. The card measures 85.5 mm deep, 25 mm wide, and 79 mm high, and wiring is completed through six screw terminals positioned on the front edge. At only 0.13 kg, the unit adds little mass to manifold assemblies, and its slim profile leaves airflow paths unobstructed. Front-facing terminal access also helps keep wiring reachable in narrow control spaces where multiple valve amplifiers must be installed side by side. The open-frame format is intended for protected cabinet mounting rather than exposed field installation.