Product Description:

The VT-VRPA1-150-1X/V0/0 is an electric amplifier card produced by Bosch Rexroth Indramat within the VT-VRPA Electric Amplifiers series. It plugs into a standardized Euro card rack and serves as the interface between a motion controller and proportional solenoid hardware used in automated hydraulic circuits. By modulating current according to an external command signal, the card enables precise actuation of valves and cylinders in assembly lines, presses, and test stands. This arrangement helps hydraulic motion respond more smoothly to changing setpoints and load conditions during operation.

The command socket accepts a full-scale input of +6 V, while the actual value socket swings to -6 V for closed-loop feedback. Internally, an oscillator running at 2.5 kHz ±10% converts the voltage reference into a pulse-width-modulated drive that passes through a time-lag network before reaching the output stage. Protection for downstream wiring is provided by a 2.5 A T fuse situated on the board edge. The power section draws from a regulated supply of 24 V DC, and the analog stage uses internal reference rails to keep signal processing stable. The controlled output current is matched to the connected solenoid so valve response remains consistent during normal load changes, and the delayed signal path helps limit abrupt current transitions.

I/O connectivity follows the DIN EN 60603-2 Form D backplane pattern and is presented on a 32-pin blade connection, allowing rapid exchange without re-terminating field cables. The voltage input stage exhibits an impedance of 100 Ω, preventing controller overloading, while the monitor output can source or sink ±25 mA for external meters or recorders. Additional measurement points include a 1 kΩ W/x socket for dynamic tests. The card layout respects Euro card dimensions so it mates with standard DIN rail subracks, and its fuse and connector placement keep access clear when neighboring modules are installed.