Product Description:

The VT-SR7-1X/0/A4VS.250HS is an electronic valve-control card developed by Bosch Rexroth Indramat for the VT-SWMA modules series. It conditions analog reference signals and issues regulated coil current so that proportional or servo-hydraulic actuators track a commanded position or pressure setpoint inside automated machinery. The board follows the 100 × 160 mm Eurocard footprint, allowing direct insertion into standard rack slots used on presses, molding equipment, and test stands. Because it mounts in a standard card rack, it can be used where several hydraulic axes or pressure loops are grouped in one control cabinet.

The card is energized from a bipolar logic supply of ±24 VDC, while the command channel and feedback loop share a single-ended ±10 V range that matches common PLC analog outputs. A high input impedance of 50 kΩ minimizes loading on those controllers. Field wiring terminates on a 32-pin DIN 41612 Form D header, allowing quick removal without individual screw terminals. Internal modulation employs a dither current of 3 mA at 340 Hz; this oscillation reduces hydraulic stiction and steadies small-signal response. When powered, the card also provides an auxiliary ±15 V rail for external transducers and monitoring circuits, avoiding the need for a separate power supply.

The output stage can deliver up to ±60 mA to the valve coil, enabling accurate control of medium-sized proportional spools. A relay on the board engages at a call-up level of +24 V, operates through a 700 Ω coil, and releases within 4 ms, allowing fast safety shutdowns commanded by the machine controller. Overall card depth is 160 mm, and the exposed front panel rises 128.4 mm above the rack rail. The front-facing arrangement keeps status access and electrical connections concentrated at the rack face, which suits compact panel layouts.