VT 1600-3X-E0-VT4749-U46 by Bosch Rexroth Indramat

The VT 1600-3X-E0-VT4749-U46 servo amplifier board is manufactured by Bosch Rexroth Indramat as a member of the VT 1600 Servo Amplifiers series. Installed in a modular valve-control rack, this card converts low-level command voltages into controlled coil currents that drive proportional hydraulic valves. This operation allows repeatable pressure or flow regulation in automated machinery that uses electrically controlled hydraulic axes. The board follows the Euro Card outline, allowing it to fit established modular control systems.

The board occupies a compact 100 × 160 mm footprint, so it fits standard backplane frames without custom mounting hardware. Its edge connectors, front plate, and mounting holes conform to the DIN 41 494 dimensional standard, ensuring compatibility with other DIN plug-in modules. A front plate height of 128 mm positions status LEDs and test points at a uniform elevation. Its width of 8 HP reserves one slot in a typical 19-inch subrack. Power is supplied through dedicated 14ac, 16ac, and 20ac pins that route a regulated ±15 VDC supply to the amplifier stages. Because the card does not include a ±15 V regulator, it relies on the cabinet's centralized supply to maintain stable voltage for signal processing and valve control.

Electrical connections are handled by a rear connector with 32 pins, separating analog inputs, reference outputs, and relay contacts to minimize crosstalk. The amplifier draws less than 200 mA from the ±15 V source, helping limit heat generation in densely populated rack assemblies. Its onboard signal relay has a coil resistance of 2000 ?, which restricts current flow when the relay is energized. Coil energization and release occur within 1 ms, supporting rapid valve enable and disable commands during high-speed control loops. Dedicated supply connections keep amplifier power separate from the primary signal paths. The standardized rear connection also permits orderly routing of command, reference, and relay circuits through the rack backplane.