Product Description:

The VT-11029-12 servo amplifier is manufactured by Bosch Rexroth Indramat within the VT Servo Amplifiers series. The module converts low-level control signals into regulated current for proportional valve coils, making it a link between electronic controllers and hydraulic actuators in automated machinery. Supplied from a 24 V cabinet source, it produces a pulse-width-modulated output so the valve position follows command inputs. Its compact format permits dense packing in control enclosures where multiple axes or pressure loops must be managed without separate power stages.

The supply range extends from 21 V to 35 V, with a nominal operating level of 24 VDC. Under dynamic demand, the board draws up to 0.85 A while maintaining a constant bias current of 200 mA that holds the valve near its null position. Drive current can rise to 700 mA when full spool displacement is required, provided the connected coil has a resistance of 19.5 Ω at 20 °C. Current is applied as a chopper signal at a nominal frequency of 100 Hz ±15%, and total power consumption does not exceed 20 VA. The enclosure has an IP20 protection rating, which guards against contact with hazardous internal parts and entry by larger solid objects. All input and output wiring connects to six screw terminals arranged along the front edge for accessible cabinet wiring.

The housing clips onto a TH 35/7.5 DIN rail, occupies 25 mm of horizontal space, and extends 85.5 mm behind the panel door. Its overall height is 79 mm, allowing the module to fit beneath many standard wiring ducts. Despite its steel carrier and populated circuit board, the unit weighs only 0.13 kg, which reduces the load placed on light-gauge mounting plates. Heat generated by internal switching remains moderate because the bias and peak currents are limited, so no additional airflow or heat-sink hardware is required.