Product Description:

The VT-2000-S46/1 is a plug-in proportional amplifier card built by Bosch Rexroth Indramat for the VT 2000 Proportional Amplifiers series. Installed in a valve control rack, the board conditions low-level command voltages and drives a single proportional solenoid so hydraulic flow or pressure can be adjusted by a PLC or analog controller. By regulating current to the valve coil, it converts an electrical reference into a repeatable hydraulic output for precise motion or force control in industrial automation systems.

The Eurocard measures 100 × 160 mm and connects to a 32-pin DIN 41612 Form D backplane connector, allowing quick removal without rewiring. The electronics operate from a nominal supply of 24 VDC, but the circuit remains functional down to 22 V and tolerates line peaks up to 35 V. Power draw stays below 25 VA, with current consumption under 1 A, so the card places a limited thermal load on the control cabinet. Internal reference regulators provide ±9 V rails and a ±25 mA output for the command and feedback stages while maintaining stable operating points. With a solenoid resistance of 19.5 Ω, the card can deliver the rated field energy without exceeding its thermal limits.

Monitoring features allow the commanded and actual coil currents to be compared. The drive limits peak solenoid excitation to 800 mA, and the test socket presents a proportional signal of 800 mV when that current level is reached. A time-delay fuse rated at 2.5 A T protects the board against sustained overloads. The second high-impedance input is buffered at 100 kΩ, preventing excessive loading of external signal sources. Command input scaling assigns 9 V to 100 percent valve stroke, while the separate 6 V monitor scale supports accurate calibration during setup. The regulated supply rails also help minimize output drift when the incoming supply voltage changes within the permitted range.