Product Description:

The VT-VRPA1-527-10/V0/PV-RTP is an electric amplifier card from the VT-VRPA Electric Amplifiers series produced by Bosch Rexroth Indramat. It drives proportional pressure valves in closed-loop hydraulic circuits by converting a control voltage from the machine PLC into a regulated coil current for a DREB6X valve. Within an automation line, it modulates hydraulic pressure so actuators follow the commanded setpoint without drift. The module fits a Eurocard rack, occupies a 32-way slot, and integrates feedback processing that corrects pressure deviations in real time.

The amplifier operates from a 24 VDC nominal supply and draws up to 35 W, so panel power budgeting must accommodate both logic and solenoid energy. A valve solenoid current of 2.7 A is delivered through the onboard driver stage; this value matches the electrical rating of the DREB6X coil and supports the available pressure-control range. Closed-loop regulation relies on a carrier frequency of 7.8 kHz, which is high enough to minimize hydraulic dithering while remaining within the coil’s inductive limits. The command channel expects a source impedance of 1 kΩ, which prevents excessive loading on upstream analog outputs and supports a linear 0 to ±10 V input span. Additional telemetry is handled by a 10.2 Veff feedback signal that the card conditions internally. With 25 W available for the solenoid, the thermal design supports continuous operation without exceeding coil temperature limits.

Physical integration is supported by a DIN 41612-F32 backplane connector that carries supply, command, and feedback lines. The card occupies a 100 mm wide Eurocard and presents a front plate width of 7 TE, so slot allocation in a control rack is straightforward. Output can be trimmed with a +10 V potentiometer reference sourced at 10 mA, allowing an external setpoint dial without an extra power supply. Overall rack loading remains moderate because the electronics draw only 1.5 A at full demand, leaving capacity for additional motion, I/O, or safety modules.