Product Description:

Bosch Rexroth Indramat manufactures the VT-VRPA1-527-20/V0/PO-IS as part of the VT-VRPA Electric Amplifiers series. This Eurocard-format module is an electric proportional amplifier that installs in a 19-inch rack and conditions analog command signals for hydraulic solenoid valves. By controlling the valve coil current with closed-loop electronics, the card lets a control system adjust flow or pressure dynamically, a common requirement in presses, injection molding machines, and position-controlled cylinders used throughout industrial automation.

Stable operation begins with a board supply of 24 VDC, and internal circuitry limits the input burden through a command input resistance of 100 kΩ; this high impedance minimizes loading on upstream controllers. Under normal duty, the amplifier consumes only 37 W, while the supply current can rise to 1.7 A when both power stages and reference supplies are fully engaged. The power stage can deliver up to 2.7 A of regulated coil current, enabling accurate valve positioning even on high-force actuators. Physical dimensions of 160 mm by 100 mm fit the IEC 60297-3 form factor, and a mass of 0.36 kg keeps cabinet weight low. Auxiliary ±10 V potentiometer outputs rated for 10 mA allow convenient local setpoint generation during setup.

Field wiring is handled through a DIN 41612-F32 edge connector that carries power, signal, and feedback lines in a single plug. The output stage is rated for a coil load of 40 VA, so valve coils within that apparent-power range can be driven without additional boosters. For position feedback devices, the card supplies a stabilized reference of ±15 VDC, eliminating the need for an external sensor supply. Front-panel trim allows offset correction within a range of ±5 %, simplifying zero-shift compensation after installation. A dedicated 100 mA error output supports status lamps or interlock relays.