Product Description:

The VT-VSPA1-2-1X-V0-0 is an analog proportional amplifier card produced by Bosch Rexroth Indramat for the VT-VSPA Proportional Amplifiers series. Installed in a valve control rack, the module conditions low-level command signals into controlled coil currents that shift hydraulic proportional valves in industrial automation systems such as presses, molding machines, and mobile workstations. By translating electrical setpoints into precise hydraulic flow adjustments, the card enables closed-loop positioning and pressure regulation within the machine’s motion sequence. Its role is to provide stable valve actuation so hydraulic response remains predictable during changing load conditions.

The board runs from a nominal supply of 24 VDC and occupies a Eurocard footprint of 100 × 160 mm. Internally, a clock-pulse generator switches the output stage at 250 Hz so that dither is applied to the valve for friction reduction. The power section can deliver up to 1.9 A to a proportional solenoid, while the voltage reference provides a stabilized +10 V for external potentiometers. A front-panel fuse rated at 2 A protects the card against accidental overloads. Signal processing uses an actual-value scale of 1 mV/mA, and the current input has a load of 100 Ω while the differential command input presents at least 50 kΩ to reduce loading on a PLC analog channel. The regulated output circuit also supplies 25 mA for feedback devices used in the control loop.

The card accepts supply levels up to 35 V and down to 18 V, maintaining function without drift until the system reaches its maximum consumption of 24 VA. Safe operation is specified between 0 °C and 50 °C, which suits typical control-cabinet conditions in industrial equipment. This operating range suits enclosed cabinets where power supplies, I/O cards, and motion controls are mounted close together. Stable electrical input and moderate ambient temperature help the amplifier maintain repeatable valve response during continuous machine cycles.