Bosch Rexroth R900779644

The Bosch Rexroth VT-MRPA1 Valve Amplifier is designed for precise control of direct operated proportional pressure relief valves and proportional flow control valves with electrical position feedback. This analog, modular amplifier is engineered to provide reliable performance in demanding industrial applications. It features a command value input of +10 V (differential input), a ramp generator with separately adjustable ramp times for up and down, and a zero point potentiometer for accurate adjustments.

The amplifier includes an amplitude attenuator, enable input, and reverse polarity protection for the voltage supply. It also has a power supply unit with a DC/DC converter that operates without a raised zero point, ensuring stable performance. The device is equipped with cable break detection in the position transducer branch and LED indicators for operational status, including ready for operation (green) and enable (yellow).

For ease of use, the VT-MRPA1 features measuring sockets for command value, actual value, and ramp times. The modular design allows for easy installation on top hat rails according to EN 60715, with electrical connections established via screw terminals. The amplifier operates at 24 V direct voltage and includes a making current limiter to prevent high current peaks during startup.

The internal command value signal is derived from the external command value signal and the zero point offset, ensuring precise control of the solenoid current and valve...