VT-SR2-1X/1-100

The VT-SR2-1X/1-100 is an analog valve driver card manufactured by Bosch Rexroth Indramat for the VT-SWMA Modules series. As a rack-mountable control module, it translates voltage commands from a machine controller into proportional coil current for directional or pressure valves used in automated hydraulic systems. By conditioning the command signal and limiting the output current, the card supports stable servo-hydraulic motion without requiring additional discrete circuitry. Its compact board format allows direct integration into centralized 19-inch electronics bays that also contain related power supplies and PLC hardware. The card operates within the electrohydraulic control layer that connects digital control logic to fluid-power actuators.

At the signal interface, the module accepts a differential command value of ±10 V, matching standard PLC analog outputs. The analog processing stage is powered by an isolated controller supply of ±15 V, while the power stage draws system energy from an auxiliary bus at 24 VDC. Within these operating limits, the driver can deliver a solenoid current of up to ±100 mA, allowing direct actuation of small to medium-sized proportional valves without external boosters. All electrical terminations are routed through a 32-pin connector plug, Form D, simplifying installation and providing a common connection point for command, power, and output wiring. The connector format also supports orderly routing within compatible rack assemblies.

The module uses a printed circuit board assembly intended for installation in a card holder or 19-inch rack, so it does not require an additional enclosure within the electronics bay. The design has no position feedback channels, so separate sensors must monitor the downstream valve or cylinder when closed-loop position control is required. Those sensors can return process information to the machine controller, which can then adjust the command signal supplied to the card. With a mass of only 0.26 kg, the module places minimal load on rack guides and supports dense installation of multiple valve drivers inside a control cabinet. Its board-style configuration also preserves access to the connector and adjustment points after the card is installed in the rack.