Product Description:

The VT 1600 S 3X-E1 is a plug-in servo amplifier card produced by Bosch Rexroth Indramat within the VT 1600 Servo Amplifiers series. Designed for closed-loop proportional valve control, the card conditions input commands and supplies a modulated current to a valve coil, forming an intermediate stage between a motion controller and hydraulic actuation. By fitting directly into a Eurocard rack, it streamlines installation in industrial automation cabinets where compact signal conditioning and precise hydraulic positioning are required. This arrangement allows the higher-level control system to send command signals while the card manages the electrical drive needed for stable valve response.

The card follows the 3U Eurocard format, giving a front height of 128 mm and an overall face width of 8 HP. Its printed circuit area measures 100 × 160 mm, providing enough surface for power components without exceeding typical rack slot depth. The electrical interface expects a stabilized bus supply of ±24 VDC, allowing the onboard electronics to remain centered around zero for bidirectional valve control. For dynamic spool positioning, the amplifier injects a carrier at 340 Hz, and the frequency is matched to proportional valve iron characteristics to minimize hysteresis. Because the card uses that frequency instead of pure DC, positional chatter is avoided while maintaining linear flow.

Output current modulation tops at 3 mApp, a value that preserves valve coil temperature while still producing full stroke. Command relay circuitry is built with a winding resistance of 2000 Ω, and the device is specified for a switching period of 1 ms, so logic signals can toggle the output quickly during closed-loop corrections. The short switching period helps the card respond rapidly to changing control signals during operation. Despite its multiple functions, the amplifier weighs only 0.15 kg, reducing mass on hinged front panels during handling and installation.