Product Description:

The VT-VPRAP1-540-10/V0/T-SI is an electric amplifier card supplied by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. It is intended to drive proportional solenoid valves and integrate pressure regulation functions into modular industrial control racks. By converting low-level command signals into controlled coil current, the card enables closed-loop actuation of hydraulic elements in automated presses, die-casting machines, and similar equipment. Its control role supports stable valve response in systems that require repeatable hydraulic pressure adjustment during changing operating conditions.

The unit follows a European-format card outline, allowing direct insertion into standardized 19-inch sub-racks, and its front panel occupies only 7 TE of width. A nominal supply of 24 V DC feeds a clocked current regulator output stage that draws a steady 1.7 A during typical operation. Command inputs from an external controller operate at 24 V / 0.1 A max, while a fault output line can source 100 mA max for system diagnostics. These current limits help protect upstream PLC electronics and maintain predictable load conditions. The flushing function is present, so the valve can be purged automatically whenever an override signal is applied. Internal PI action handles position control, and the regulator response is set by the factory-installed clock frequency, so no external frequency adjustment is required.

Field wiring terminates on a DIN 41612-F32 plug connector, providing a standardized backplane connection in the rack. Output filtering relies on a 4700 µF/63 V DC smoothing capacitor that helps prevent ripple from reaching the proportional coil. When commanded to full scale, the amplifier can deliver a solenoid current of 2.7 A, corresponding to a coil power of 40 W. Internal pressure tapping, identified as T1, supplies reference pressure for the flushing path, and a 10 kΩ front-panel potentiometer lets the null point be fine-tuned. PI position control parameters remain accessible to support stable closed-loop operation.