Product Description:

The VT-VSPA1-1-11E/V0/0 is a plug-in proportional amplifier card from Bosch Rexroth Indramat that belongs to the VT-VSPA Proportional Amplifiers series. Installed in a 19-inch rack, it scales and limits analog command currents so hydraulic solenoid valves can be driven with consistent force even when line voltage fluctuates. Its circuitry provides onboard voltage regulation, status signaling, and fuse protection, making the card a self-contained interface between a PLC’s low-power control outputs and the higher-current demands of proportional valve coils.

The board footprint is 100 × 160 mm, so it occupies a single Eurocard slot and leaves room for airflow inside the enclosure. Electrical access is provided through a 32-pin male connector that follows the DIN 41612 Form D pattern; this standardized interface supports consistent backplane wiring. Nominal operation requires a supply of +24 VDC, while undervoltage shutdown occurs below +22 V, and the hardware tolerates transient voltages up to +35 V. A front-panel fuse rated at 2.5 A T isolates the card from cabinet faults. Total power demand remains within a ceiling of 50 VA even when both output channels deliver maximum current. These limits assist with power allocation and help reduce thermal loading in compact hydraulic power units.

Each command input presents a 100 Ω load, allowing direct connection to current-mode controllers without excessive burden voltage. Internally, the card provides a stabilized output of ±9 V ±1% for reference and sensor circuits, and it can source or sink up to ±25 mA to keep transducers within their linear range. A ready relay closes when the supply voltage is within tolerance and can sink 50 mA into external logic when the receiving device has an impedance greater than 10 kΩ. Peak board current consumption does not exceed 1.8 A. The assembly weighs only 0.1 kg, so it adds minimal mass to densely packed servo-hydraulic panels.