Product Description:

The VT 3000 S 55-R5 analog amplifier card belongs to the VT 3000 Analog Amplifiers series produced by Bosch Rexroth Indramat. Installed on a standardized Euro-card backplane, it conditions differential command signals and drives proportional coils in industrial automation equipment. Within hydraulic or motion assemblies, the module converts low-level references into controlled current, combining bias, gain, and protective circuits so that actuators follow setpoints with predictable linearity.

Electrical service to the board is provided from a 24 VDC ±10% supply, and the electronics consume up to 30 W, keeping heat generation moderate in sealed cabinets. A blade fuse rated at 2.5 A guards the incoming line. Control connectivity uses a DIN 41612 C-type header with 32 pins; the differential input window is 10 V, and an auxiliary ±6 V channel allows external scaling. The amplifier can source a maximum of 800 mA as long as the connected coil resistance stays below 19.5 Ω. To ensure stable operation, the circuit enforces a minimum bias of 20 mA and requires at least 500 Ω at the command input so that feedback networks do not overload the front end.

The reference path handles up to ±9 V, giving ample span for coarse and fine control loops. Mechanically, the card stands 185 mm tall, extends 170 mm into the rack, and its faceplate occupies eight divisions, allowing dense packing beside companion modules. Thermal behavior is predictable; offset changes only 0.5 ‰/K, so calibration remains valid across normal enclosure temperatures. The light 0.15 kg weight makes the card easier to handle during installation and service. Its compact form also leaves room for adjacent control and interface boards in the same rack.