VT 2253 by Bosch Rexroth Indramat

The VT 2253 from Bosch Rexroth Indramat is a compact proportional amplifier in the VT 2000 Proportional Amplifiers series designed for demanding industrial automation tasks. Weighing only 0.1 kg, this electrical amplifier operates on a 24 VDC +40%/-5% supply, ensuring efficient power delivery with a nominal Power Consumption of < 25 VA>. Its robust design features a Ramp Time Adjustment Range of 30 ms to approx. 1 s or 5 s for precise control over solenoid activation rates. The lightweight unit measures 100 mm x 160 mm (Card Dimensions) and includes a 2.5 A time lag (Fuse Rating) to protect critical circuitry.

With dual command inputs supporting both single-ended (0 to +9 V, Command Value 1) and differential signals (0 to +10 V, Command Value 2) at an Input Resistance of 100 kOhms, the VT 2253 delivers accurate signal processing. The device offers a Biasing Current adjustable from 10 mA to 300 mA via an onboard potentiometer, and provides a controlled Solenoid Current Resistance of 800 mA ±10%/–5%. Selectable Clock Frequency settings of 100 Hz or 200 Hz ±10% optimize dynamic response and energy use. The amplifier’s Current Consumption remains under 1 A during operation, while short-circuit protection on the solenoid cable and reverse-polarity protection for the supply safeguard against electrical faults.

Operational reliability is reinforced by an Operating Range of 22 V to 35 V and a Permissible Operating Temperature Range of 0 °C to +50 °C, ensuring performance in varied environments. A clocked output stage with regulated voltage of ±9 V ±1% supports external loads up to 25 mA, maintaining stable control signals. The integrated ramp generator enables independent up and down ramp rate adjustments, enhancing valve response and preventing pressure spikes. Comprehensive thermal and electrical safeguards, including the 2.5 A time lag fuse and reverse polarity protection, deliver consistent service life in continuous industrial operation.

Designed for seamless integration with both direct and pilot-operated proportional pressure control valves, the VT 2253 excels in hydraulic and pneumatic control systems. Its compact footprint and standard card dimensions facilitate mounting in confined control cabinets and modular automation platforms. Engineers can deploy this amplifier across packaging machinery, injection molding equipment, and mobile hydraulic applications, leveraging its precise output current control and versatile command interfaces. With straightforward wiring and robust protection features, the VT 2253 streamlines system integration and enhances overall process reliability.