VT1600S311 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat VT1600S311 is part of the VT 1600 Servo Amplifiers series and has a card size of 100 by 160 mm. This amplifier features 32 connector pins, three PID potentiometers, and a power supply current of less than 200 mA. It also has a dither current rating of 3 mApp at 340 Hz and weighs 0.15 kg.
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Product Description:
The VT1600S311 is an analog servo amplifier card produced by Bosch Rexroth Indramat within the VT 1600 Servo Amplifiers series. The board conditions command signals and generates proportional currents for hydraulic valves, allowing closed-loop position or pressure control in industrial automation systems. Installed in a Eurocard rack, it interfaces directly with system controllers and drives solenoid-operated valves, translating low-level electrical references into coil currents for precise motion tasks. This type of card is used where hydraulic actuators need continuously variable valve control instead of simple switching.
The amplifier follows the Eurocard format with a 100 x 160 mm outline, so it matches standard 3U card frames and DIN 41612 backplanes. A rear edge connector provides 32 signal and power contacts for plug-in connection to the backplane. That connection allows the card to receive supply, command, and control signals through the rack system without separate point-to-point wiring. Internal signal conditioning is supported by a factory-set dither stage that injects 3 mApp of AC current at 340 Hz into the valve coil, which helps reduce static friction and improve spool linearity. The front panel includes 3 potentiometers for direct adjustment of the proportional, integral, and derivative gains in the PID loop. During operation, the electronics draw less than 200 mA from the rack supply, keeping the thermal load low inside compact cabinets.
Relay circuitry on the card isolates the command path, and the coil presents 2000 Ω of resistance so the triggering current remains modest and compatible with TTL driver stages. Its switching window of 1 ms supports fast enable and disable sequences when interlocks require immediate valve shutdown. The assembly mass is only 0.15 kg, which limits mechanical stress on the card guide rails. Relay isolation also helps separate low-level command handling from the switched path, reducing unwanted interaction between logic signals and valve control functions. The low mass helps the card fit standard rack hardware without adding excessive loading to the mounting structure.
