Product Description:

The VT 2000-52-A is a proportional amplifier module manufactured by Bosch Rexroth Indramat within the VT 2000 Proportional Amplifiers series. Installed in control cabinets, the board converts a reference signal from a PLC or analog controller into a regulated load current for the coil of a proportional hydraulic valve. This allows the valve to respond consistently to changing command levels during closed-loop hydraulic control. By shaping the magnet force with controlled gain and limits, the amplifier helps industrial presses, molding machines, and test stands achieve fine pressure and flow adjustment while isolating the electronics from valve inductance.

The amplifier is powered from a nominal 24 VDC supply, and its internal regulator keeps the circuit functional down to 22 V while tolerating surges up to 35 V without losing control accuracy. Under steady operation, the card draws less than 25 VA of power, and the total input current stays below 1 A, so cabinet wiring can remain in the low-ampere range. A front-panel fuse rated F 2.5 A T protects the supply track against short-circuit faults. The command stage can deliver a full-scale output of +6 V to external monitors, and an auxiliary input presents 100 kΩ impedance to avoid loading sensitive reference sources.

On the output side, the amplifier can supply up to 800 mA of solenoid current, matching valves with a coil resistance of 19.5 Ω and permitting fast magnet force buildup. A separate bias channel is limited to 300 mA, allowing preload of the spool position before the command signal is applied. Closed-loop control is assisted by a current feedback scale of 1 mV/mA, so a simple voltmeter can be used to verify coil drive without disturbing the circuit. Internal stabilization maintains ±9 V reference rails and holds the regulated load current within ±25 mA, which supports repeatable valve response across temperature variations.