Product Description:

The VT-VSPA2-1-11/ T5 is a plug-in proportional amplifier card manufactured by Bosch Rexroth Indramat within the VT-VSPA Proportional Amplifiers series. The board interfaces between a controller’s analog command signals and a proportional hydraulic valve, shaping the output current so that the spool position tracks the commanded value. By incorporating adjustable ramps and protective circuitry, it enables stable pressure or flow regulation in presses, die-casting units, and injection systems where electronic modulation of hydraulic power is required for repeatable operation.

The card operates from a regulated supply of 24 VDC, and its electronics draw less than 2 A, allowing use with compact power supplies. Each of the two output channels is limited to 2.5 A, which protects the valve coils against thermal overload. Signal integrity is preserved by a differential input impedance greater than 50 kΩ, so standard PLC voltage outputs are not excessively loaded. The card provides five ramp-time presets that allow the rise and fall times to be adjusted for smooth actuator motion. Even under maximum load, overall consumption remains below 50 VA, minimizing heat within the control cabinet.

Supply supervision disables the drive functions when the input drops below 18 V or exceeds 35 V, preventing erratic valve behavior during brownouts or wiring faults. A command path with a resistance greater than 100 kΩ accepts high-impedance feedback devices without introducing drift, while a fixed 100 Ω current input load supports current-mode control. The module provides a ±10 V reference output with an accuracy of ±2% and a maximum current of 25 mA for external sensors. A ready contact supplies more than 16 V at 50 mA to indicate operational status. Additional protection is provided by an onboard 2 A fuse, and an accessible 10 kΩ terminal supports custom ramp extension.