Product Description:

The VT-VSPD-1-24/V0/0-0-1 is a plug-in proportional amplifier card from the Bosch Rexroth Indramat VT-VSPA Proportional Amplifiers series. It installs in a 19-inch rack, where it conditions control signals and drives the current loops of proportional hydraulic valves. The card supports analog actuation in machine tools, presses, and process lines that require valve movement to follow digital setpoints with repeatable accuracy.

This card operates from a regulated supply of 24 VDC. Its input stage remains active at voltages as low as 21 V and tolerates surges up to 30 V. The maximum current draw of 1.5 A is protected by a 4 A time-lag fuse mounted on the board. The internal valve ramp generator can extend command transitions to 300 s, allowing gradual pressure or speed changes in large hydraulic circuits. The card does not have a front display or setpoint call-up function, so adjustments are performed through the RS-232 serial port. Its integrated valve output stage senses the connected load and supervises coil resistance during operation. The controller cycle maintains stable signal processing for closed-loop hydraulic control.

The Eurocard measures 100 × 160 mm and connects to the backplane through a 64-pole DIN 41612 G connector that carries power, command, and sensor lines. The RS-232 interface exchanges parameters with a host PLC within a 2 ms scan window. The power section can supply up to 2.5 A to each solenoid when the coil resistance does not exceed 19 Ω. These electrical limits help prevent saturation and excessive heat in typical NG10 and NG16 valve coils. The analog monitor port requires a minimum output load of 1 kΩ to remain within its linear operating range. Because the communication and valve-control functions are integrated on the same board, the card can process command changes while monitoring the connected hydraulic load.