Product Description:

The VT-VSPA1-11-1X-V0-0 is an analog proportional amplifier card produced by Bosch Rexroth Indramat for the VT-VSPA Proportional Amplifiers series. Housed as a 3U Eurocard, it is inserted into a backplane to receive 24 VDC logic power and a reference command from the machine controller. The module translates that reference into a regulated current for proportional solenoid valves, helping provide repeatable pressure, flow, or position control in automated hydraulic machinery. This arrangement supports precise modulation of hydraulic actuators in presses, handling systems, and other equipment that depends on steady analog valve control.

Physical layout follows the standard 100 x 160 mm card format, allowing direct rack mounting without custom hardware. All electrical connections arrive through a 48-pin DIN 41612 Design F header that carries supply, command, and feedback lines. Internally, a clock oscillator switches at 250 Hz to chop the power stage, a frequency high enough to minimize valve hysteresis while limiting switching losses. During operation, the card draws <2 A from the rack bus, and its input accepts 24 VDC (+40%/-20%); a replaceable 2 A fuse protects the circuitry against overcurrent events. Power absorption remains below 24 VA, helping keep cabinet heat rise modest.

Output capability centers on a peak stage current of 1.9 A, which is suitable for medium-size NG6 and NG10 valves. A stabilized reference of +10 V ±2% is available on the connector for external potentiometers, while the control channel provides a regulated 25 mA feedback loop for position sensors. Ready signaling is TTL-compatible, with the card pulling the line above 16 V when internal checks pass and below 1 V when a fault is detected. The allowable supply ceiling is 35 V, and the zero-shift adjustment range reaches +30% to help match valve symmetry. The reference and feedback circuits allow external command devices and position sensors to interface with the same card, which supports stable closed-loop valve control. The assembly weighs 0.15 kg, which keeps handling simple during removal.