Product Description:

The VT-VSPA1-1-1X-V1 is an analog proportional amplifier card manufactured by Bosch Rexroth Indramat within the VT-VSPA Proportional Amplifiers series. Installed in a 19-inch rack, the card accepts command voltages and drives solenoid coils so hydraulic valves track the requested position or force. Its function is to provide closed-loop, current-controlled output that links electronic control systems with hydraulic power stages in industrial automation lines, presses, and mobile machinery. This arrangement lets a higher-level controller regulate hydraulic motion with smooth proportional output.

The module operates from 24 V DC nominal supply and draws up to 1.8 A, translating to a ceiling of 50 VA under worst-case loading. The input stage presents 100 Ω of current input resistance for single-ended signals, while differential inputs see at least ≥100 kΩ, minimizing loading on upstream controllers. Internally, the analog circuitry is protected by a 2.5 A time-lag fuse, and the board connects through a 32-pin DIN 41612 D header that carries power, command, and feedback lines. The connector layout keeps these circuits on one plug interface, which helps simplify panel wiring. With these limits, the amplifier remains stable between the lower 22 V and upper 35 V thresholds, helping maintain predictable valve behavior even when the plant power bus fluctuates.

For reference generation, the card supplies a stabilized ±9 V source rated for 25 mA so external potentiometers or sensors can build simple setpoint networks. Its ready output can sink or source 50 mA and is intended to drive indicator lamps or PLC inputs provided the connected load is at least 10 kΩ. These auxiliary circuits reduce the need for external power rails and simplify wiring. Because the electronics are analog, response remains continuous without digital quantization. The card can be integrated directly with proportional valve control circuits in general industrial machinery.