Product Description:

The VT-VRPA1-527-10/V0/RTP is an analog electric amplifier card from Bosch Rexroth Indramat’s VT-VRPA Electric Amplifiers series. Installed in hydraulic control racks, the card modulates pilot and main stage solenoids so proportional valves can track a voltage command with stable force. By converting a differential input signal into controlled solenoid current, it provides closed-loop positioning or pressure regulation within larger industrial automation systems. The module is intended for rack-based hydraulic systems where compact analog control hardware is used alongside valve electronics.

The card is powered from a single 24 V DC supply and accepts a differential setpoint of ±10 V. A high input resistance of 100 kΩ minimizes loading on upstream motion controllers, while its internal potentiometer is fixed at 10 kΩ for offset trimming. Maximum solenoid current reaches 2.7 A, and allowable solenoid power is limited to 40 VA so the valve coil stays within thermal limits. Continuous output is capped at 1.5 A, with an independent fault path that sources 100 mA when an error is detected. Transducer supply rails of ±15 V support external position or pressure feedback devices, and the main feedback loop requires at least 10 kΩ of load to maintain accuracy. A secondary pilot feedback circuit uses 20 kΩ resistance so stage overlap can be calibrated. Zero adjustment is possible across ±5% of full scale to eliminate residual offsets after installation.

The printed-circuit assembly follows Eurocard dimensions of 160 mm in length and 100 mm in width, allowing direct insertion into standardized sub-racks. Electrical interfacing is through a 32-pin rear edge connector identified as DIN 41612-F32, which carries power, command, feedback, and fault signals without discrete wiring. The Eurocard format supports orderly placement with other rack modules in the same enclosure. The rear edge connection keeps power and signal paths on the backplane instead of relying on separate front-wired terminals. This layout reduces the number of individual wire terminations at the card face and keeps the rack arrangement compact.