Product Description:

The VT-VSPA1-1-1X-S043A-1609 proportional amplifier card is produced by Bosch Rexroth Indramat for the VT-VSPA Proportional Amplifiers series. Installed in hydraulic control racks, the board converts low-level voltage commands into stabilized solenoid currents so directional or pressure valves track reference signals with repeatable accuracy in real time. By providing this intermediate current regulation, the card allows machine controllers to control actuator position or force without directly managing the non-linear behavior of valve coils. This arrangement helps hydraulic motion remain smooth when load conditions and command levels change during operation.

The card operates from a nominal supply of 24 V DC, with under-voltage protection that keeps functions active down to 22 V and over-voltage tolerance up to 35 V. During dynamic control cycles, the electronics draw no more than 1.8 A, corresponding to a maximum power demand of 50 VA. A 2.5 A slow-blow fuse on the feed line protects the circuit against sustained overloads. Input 1 reaches full modulation when the command source supplies 9 V, and the onboard potentiometer output of ±9 V can power external trim potentiometers at a load of 25 mA without an added supply.

The actual value scale is 1 mV = 1 mA, while the command socket interprets a span of 6 V = 100% for proportional control, which supports straightforward matching between PLC analog outputs and valve current. The board follows the Eurocard format and measures 100 × 160 mm, with a front plate height of 128.4 mm for direct insertion into standard card cages. Field wiring is completed through a 32-pole male multipoint connector built to the DIN 41612 Design D pattern, which helps keep terminal assignment consistent in rack installations. The assembly weighs only 0.1 kg, which keeps mechanical load low on the edge connector during service in vibrating hydraulic cabinets.