Product Description:

The VT-VSPA2-1-10e/T5 is a plug-in proportional amplifier card produced by Bosch Rexroth Indramat for the VT-VSPA Proportional Amplifiers series. Installed in a 19-inch rack, the card converts low-level command signals from a PLC into controlled currents that drive proportional hydraulic valves used in presses, test rigs, or motion axes. Its electronic circuits condition reference, ramp, and feedback inputs so that spool position follows the setpoint with reproducible accuracy.

The board area measures 100 × 160 mm, a Eurocard format that fits standard DIN housings and allows tight cabinet layouts. All electrical interfaces are routed through a single 48-pin DIN 41612 Form F connector, simplifying backplane wiring in multi-axis manifolds. Supply power is nominally 24 VDC; an onboard regulator stabilizes this line and supports a maximum stage draw of 2.5 A to energize the valve coils. With a demand of only < 50 VA, the amplifier imposes a limited load on control power supplies. The command channel presents 100 Ω of current input load and a differential input resistance greater than 50 kΩ for voltage mode, minimizing the burden on upstream analog modules. A separate 10 kΩ ramp input shapes acceleration without changing the core setpoint.

The operating voltage has a lower limit of 18 V and an upper limit of 35 V, allowing the logic to remain functional during brownouts while protecting components against overvoltage surges. A field-replaceable 2 A fuse disconnects the card if the external supply exceeds the safe current level. Internal monitoring drives a ready output that can source up to 50 mA for status lamps or interlocks, while the regulated reference output provides 25 mA for potentiometer chains. The amplifier has a mass of only 0.17 kg, so vibration forces transmitted from hydraulic manifolds remain low. Its low mass also allows card insertion without substantial support hardware.