Product Description:

The VT 2000S4X-1 board is a proportional amplifier card from Bosch Rexroth Indramat's VT 2000 Proportional Amplifiers series. In closed-loop hydraulic drive systems, the card conditions low-level command signals and supplies controlled current to a valve solenoid to modulate flow or pressure. This control method helps hydraulic actuators respond smoothly to changing demand from the machine controller. Because it mounts on standardized Eurocard rails, it can be inserted into multi-axis automation racks with consistent mechanical alignment. The part is identified as VT 2000S4X-1 for use with matching Rexroth proportional valves.

Electrical limits are based on a 24 VDC supply, and operation is permitted from 22 V to 35 V before shutdown. Nominal current draw stays below 1 A, and a protective fuse rated at 2.5 A T is fitted on the board. Internally, the card stabilizes the output rails to ±9 V and the reference driver channel to ±25 mA so connected electronics receive repeatable excitation. The bias network can deliver up to 300 mA for valve offset trimming. Command inputs follow a linear scale of +6 V for 100% stroke, while the monitoring test points use a 1 mV-to-1 mA translation for direct current verification. Input 2 presents 100 kΩ impedance to minimize loading on upstream controllers.

The hardware follows the Eurocard format with a footprint of 100 × 160 mm and interfaces through a 32-pin male, DIN 41612 form D connector, so wiring remains standardized. Power conversion losses keep total consumption below 25 VA, even when the regulated channel sources the maximum solenoid loop current of 800 mA into a coil that measures 19.5 Ω. That combination allows the amplifier to reach the intended output current without exceeding its thermal operating range. The 1 mV/mA test scale supports straightforward current checks, and calibrated ranges help maintain repeatable valve behavior across temperature swings and line-voltage variation.