Product Description:

The VT-VSPA1-1-1X-ES43A8-1707 is a proportional amplifier card produced by Bosch Rexroth Indramat for the VT-VSPA Proportional Amplifiers series. Installed inside a standardized Eurocard rack, the module converts voltage references from a motion controller into regulated coil current for hydraulic solenoid valves, giving machinery a dependable way to modulate pressure or flow without external ramp generators. By integrating adjustable ramps and current feedback on the board, it streamlines valve actuation tasks in presses, molding machines, and general-purpose automation lines. This arrangement helps hydraulic actuators respond smoothly during speed changes instead of reacting with abrupt valve movements.

The card is powered from a system supply of 24 V DC, which the onboard regulator converts to ±9 V for its analog circuitry. A command socket accepts a full-scale reference of +6 V, and the input channel limits of +9 V and +10 V let the controller match the command span to the process variable. Separate channel scaling lets the module adapt to different analog output ranges without extra signal-conditioning hardware. Channel 1 reaches full output at +9 V, while channel 2 presents a 100 Ω input impedance to minimize loading on upstream electronics. Actual current flowing through the valve is monitored with an accuracy of 1 mV/mA, enabling tight closed-loop control up to a maximum solenoid current of 1.6 A. During normal operation, the amplifier draws no more than 1.8 A from the cabinet supply, and a 2.5 A T fuse limits fault energy if a short circuit occurs.

The board plugs into a 32-Pin DIN 41612 D connector and follows the Eurocard footprint of 100 × 160 mm, allowing direct installation in populated racks without special mounting hardware. This compact format is useful when multiple amplifier cards share the same control cabinet. Overall power consumption is capped at 50 VA, so heat rise stays manageable even when ambient cabinet temperature approaches +50 °C. Ramp generators on the card can be set anywhere from 30 ms up to 5 s, allowing valve response to be tuned without changes to the controller program.