Product Description:

The VT-VSPA1-1-1X-SO43A-1729 is a plug-in proportional amplifier board from Bosch Rexroth Indramat in the VT-VSPA Proportional Amplifiers series. Mounted in a Eurocard rack, the module links a motion controller to a hydraulic proportional valve. It converts low-power command voltages into regulated solenoid currents, enabling precise pressure or flow modulation in presses, molding machines, and handling equipment. Integrated signal conditioning and current control reduce cabinet wiring and quicken closed-loop responses.

Mechanically, the card follows the Eurocard footprint of 100 × 160 mm, so it slips into standard backplane frames without adapters. All electrical lines terminate on a 32-pole DIN 41612 D plug that provides keyed, vibration-resistant mating. Supply power passes through a 2.5 A Time-Lag fuse that absorbs brief inrush events yet protects against sustained overloads. Command Input 1 reaches full scale at 9 V; Input 2 extends to 10 V, letting the board accept either low-range or higher PLC reference levels. Differential input resistance never drops below 100 kΩ, so the source device is not loaded, and a ±9 VDC reference rail is present for external potentiometers.

The amplifier is designed for a nominal supply of 24 VDC and remains functional down to the 22 V lower limit and up to the 35 V upper limit, giving tolerance for line sag or generator ripple. Under maximum load, the electronics draw 1.8 A, translating to a peak power demand of 50 VA on the system power supply, so heat dissipation in the cabinet is moderate. A 50 mA ready transistor output signals to upstream controllers when the internal voltages are within range. Current monitoring inputs exhibit 100 Ω resistance, helping maintain stable feedback signals. Even with its steel front plate measuring 128.4 mm in height, the board weighs only 0.1 kg.