Product Description:

The VT 2000 S 41 is a proportional amplifier card produced by Bosch Rexroth Indramat for the VT 2000 Proportional Amplifiers series. Mounted in a valve control rack, the board converts low-level command voltages into controlled solenoid current so hydraulic actuators can be driven with repeatable force and position. This arrangement lets a PLC send a simple analog reference while the card handles the current regulation required by proportional valves. Because the output current is regulated rather than applied directly from the command source, the valve receives a stable actuation signal even when coil temperature or supply conditions vary. That behavior supports consistent response in positioning, clamping, and pressure-control circuits.

Normal operation uses a regulated bus of 24 VDC, but the circuitry tolerates supply variation from 22 V to 35 V without losing accuracy. Internal demand stays below <1 A, keeping power draw modest and total dissipation under 25 VA. The input channel interprets the voltage reference on a linear scale of +6 V = 100 %, which provides a direct relationship between command level and valve demand. Loop behavior can be checked at a test pin that reads 1 mV = 1 mA. The closed-loop driver can deliver up to 800 mA to a connected solenoid with 19.5 Ω resistance, allowing full valve stroke while maintaining responsive control.

The card uses a Eurocard footprint of 100 x 160 mm and plugs into a backplane through a 32-pin male, DIN 41612 form D connector. Overall weight is only 0.1 kg, which keeps the module easy to handle during installation, and the front-panel height of 128.4 mm leaves clear access to potentiometers and LEDs. Local electronics share an internal ±9 V reference rail for sensors, and the power path is protected by a 2.5 A T fuse that absorbs slow overcurrent events while allowing brief inrush when the rack is energized. The compact format suits densely populated hydraulic control panels where multiple control cards must be installed side by side without blocking access to adjacent modules.