VT-2000-51a Bosch Rexroth Indramat
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The Bosch Rexroth Indramat VT-2000-51a is a proportional amplifier from the VT 2000 Proportional Amplifiers series, designed with a 32-pin male DIN 41612 Form D connector and a card size of 100 by 160 millimeters. It operates at 24 VDC with a current consumption of less than 1 amp and has a maximum solenoid current of 800 milliamps. The amplifier features a fuse rating of 2.5 amps time-lag and supports an operating temperature range from 0 to 50 degrees Celsius.
Internal Product Review
The VT-2000-51a is a proportional amplifier engineered for stable hydraulic control with 24 VDC operation and a 32-pin DIN 41612 Form D connector. A max solenoid current of 800 mA and regulated current of ±25 mA support accurate valve actuation and consistent response in demanding control circuits. Strong electrical compatibility and dependable signal regulation make this unit a very capable choice for proportional control applications.
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Product Description:
The VT-2000-51a is a plug-in proportional amplifier card manufactured by Bosch Rexroth Indramat as part of the VT 2000 Proportional Amplifiers series. The board fits into standard industrial control racks, allowing it to connect directly to compatible rack wiring and power circuits. It supplies controlled current to a hydraulic valve solenoid so the valve responds to analog command voltages from a PLC or motion controller. This current control allows the connected proportional valve to adjust hydraulic flow or pressure in response to changes in the command signal.
The card operates at 24 VDC and maintains proper function when the supply remains between 22 V and 35 V. Input channel 2 has a resistance of 100 kΩ, minimizing the electrical load placed on upstream signal sources. The internal bias network can add up to 300 mA of offset current to establish the required valve operating point. The drive stage provides a maximum solenoid current of 800 mA for full spool displacement. During regulation, the amplifier maintains the output current within ±25 mA and the output voltage within ±9 V, supporting precise valve positioning. Board current consumption is less than 1 A, which helps limit the load placed on the cabinet power supply. Solenoids connected to the card should have a resistance of 19.5 Ω at 20 °C to match the electrical characteristics of the driver.
Total power consumption is limited to less than 25 VA, and a replaceable 2.5 A time-lag fuse mounted on the card front provides electrical protection. The printed circuit board measures 100 × 160 mm and connects through a 32-pin male DIN 41612 Form D connector, allowing the card to be removed without disturbing individual field wires. The permitted ambient operating temperature ranges from 0 °C to 50 °C, and forced cooling is not required within this range. The regulated outputs remain stable as the supply approaches the lower operating limit of 22 V. The card shuts down if the supply exceeds the upper limit of 35 V, helping protect the connected solenoid coil from overheating.
