Product Description:

The VT 3000 S 35-R5 is an analog amplifier module produced by Bosch Rexroth Indramat for the VT 3000 Analog Amplifiers series. Installed in hydraulic control racks, the card converts command signals into proportional drive currents so directional or pressure valves can follow reference inputs in automated machines and test stands. Its analog design makes it suitable for hydraulic systems that rely on rack-mounted control electronics and stable current regulation for proportional valve actuation.

The module is powered from a control bus that provides 24 VDC ±10%, which allows normal operation even when the cabinet supply varies within the permitted range. A differential input of 10 V is accepted, and a separate control channel can be driven with an input of ±9 V, allowing bipolar command signals. Converter stages on the board supply a minimum output current of 20 mA and can increase linearly to a maximum of 800 mA, providing a broad operating range for proportional valve coils. With a total power requirement of 30 W, the amplifier remains within the limits of typical 24 V control circuits. Short-circuit protection is supported by an onboard 2.5 A fuse, and the input circuit is arranged to avoid excessive loading of weak signal sources.

The output stage can drive loads up to 19.5 Ω without saturation, making the module suitable for many Bosch Rexroth proportional solenoids. Long-term stability is supported by a temperature drift of only 0.5 ‰/K, so calibration remains consistent across typical machine-room temperature changes. The mechanics follow DIN rail spacing rules, with the faceplate occupying 8 divisions, including 7 divisions on the component side and 1 division on the conductor side for wiring clearance. The board weighs 0.15 kg, which helps it fit easily into modular racks, and the protective fuse can be replaced from the front panel without removing the card.