Product Description:

The VT-VRPA1-151-12/V0/0 is an amplifier card produced by Bosch Rexroth Indramat within the VT-VRPA Electric Amplifiers series. Configured for proportional hydraulic control, the Eurocard board mounts in a 100 × 160 mm rack slot and interfaces with valves such as the 2FRE10 and 2FRE16 to translate electronic command signals into regulated drive current. By adding closed-loop precision to pressure or flow circuits, the card allows machine controllers to adjust actuator performance without manual recalibration.

Logic power is accepted at 24 VDC, a level that simplifies connection to common machine power buses. An internal square-wave generator operates at 2.5 kHz, providing the pulse-width modulation frequency used to shape the solenoid current. The differential current input presents 100 Ω of resistance, limiting the burden on upstream controllers that transmit hydraulic setpoints. The output stage can deliver up to 2.2 A to the valve coil and automatically compensate for variations in the load presented by the 10 Ω solenoid. All analog sections are referenced to supply rails maintained within ±9 V, supporting repeatable gain and minimal offset drift as temperature changes.

The actual-value output reaches -6 V, while the command channel accepts signals up to +6 V. These signal limits provide the voltage levels required for bidirectional hydraulic control. The amplifier supports external indicators or transducers that draw no more than ±25 mA, preserving the calibrated voltage levels. The Eurocard assembly has a front plate height of 128.4 mm and uses a 32-pin Form D blade connector for its electrical connections. A 2.5 A time-lag fuse protects the circuitry against sustained overcurrent conditions without opening during brief current surges. The assembled module weighs 0.15 kg, which reduces the load placed on the rack and makes the card easier to position during installation.