Product Description:

The VT-VRPA2-1-11/V0/T5 is a plug-in proportional amplifier card from Bosch Rexroth Indramat in the VT-VSPA Proportional Amplifiers series. Installed in a Eurocard rack, the unit conditions electrical command signals and drives compatible servo-hydraulic valves in closed-loop motion or pressure control systems. By generating a bi-directional command voltage and a matched current output, the card allows a PLC or analog controller to position a 4WRE 6 size directional valve with repeatable accuracy and adjustable ramping characteristics.

It accepts a nominal supply of 24 VDC through a 48-pin DIN 41612 Form F connector, and its input stage tolerates differential commands up to ±10 V while presenting an input resistance of 100 Ω. The internal oscillator runs at 5.6 kHz; this carrier frequency shapes the pulse-width-modulated power stage that can deliver up to 2.5 A to the valve solenoids. Separate terminals provide a feedback output of ±2.5 V for feedback devices and a regulated ±10 V reference that can be used by an external potentiometer. A ramp input with 10 kΩ impedance and a programmable ramp-time count of 5 allow the user to soften acceleration or deceleration without additional circuitry, helping the hydraulic axis avoid pressure shocks.

Supply supervision is built in: operation is guaranteed down to 18 V, and the logic circuitry tolerates surges up to 35 V before shutdown occurs. A front-mounted miniature fuse rated at 2 A safeguards the card and the load against short circuits on the power stage. The PCB follows the IEC Eurocard format, measuring 100 × 160 mm, so it slots into standard 3U racks beside other VT-VSPA modules. With valve compatibility limited to the 4WRE 6-2X family, the amplifier’s 10 kΩ ramp channel and regulated outputs allow stroke speed adjustment without modifying the hydraulic manifold.