Product Description:

The VT1600-S-31 is a plug-in servo amplifier card produced by Bosch Rexroth Indramat within the VT 1600 Servo Amplifiers series. Mounted in a 19-inch Eurocard rack, the module interprets analog position commands and drives proportional hydraulic valves in closed-loop motion axes. By combining PID current regulation with an injected dither signal, it supplies a controlled magnetic field so that valve spools follow reference inputs without stick-slip.

The board adheres to the Eurocard format with overall dimensions of 100 x 160 mm, and its anodized front panel occupies a height of 3U and a width of 8 HP inside the rack. Connection to the machine controller is through a DIN 41612 header that carries 32 signal and power contacts. The amplifier accepts a differential reference of ±10 V, and this range covers the full spool stroke while allowing trimming at the front panel. Internally, a 340 Hz dither carrier is injected into the output stage to linearize hydraulic response. Closed-loop control is executed by a PID algorithm that modulates solenoid current in real time, while the card’s 0.15 kg mass places minimal load on the enclosure.

With spool coils that measure 2000 Ω, the card energizes high-impedance loads, so the output stage runs in current mode. Three internal potentiometers set gain, integral time, and dither level without external tools. The injected ripple reaches 3 mApp, a magnitude selected to overcome static friction while staying below audible thresholds. Current pulses are processed on a 1 ms duty cycle, allowing the PID loop to react to rapid load changes while minimizing heat in the transistors. During normal service, the card draws under 200 mA from the back-plane supply, keeping cabinet loading modest and allowing several VT 1600 modules to share the same 24 V rail.