Features:
- Operates from a nominal 24 V DC control supply.
- Accepts an analog command spanning 0 to ±10 V.
- Provides the selected current drive for compatible 4WRP 10 E/W valves.
Material number 0811405120 corresponds to the VT-VRPA2-537-1X/V0/RTP execution and its documented legacy mapping. Both identifiers should appear on a replacement request.
The card translates low-power controller commands into the regulated coil current that positions a proportional hydraulic valve and therefore influences speed, direction or force in the machine axis.
Check the installed valve nameplate, current selector, command polarity and reference wiring before mounting. Initial adjustment belongs in a controlled hydraulic commissioning procedure, not in live production.
Supply review for 0811405120 includes the complete VT-VRPA2 type and legacy cross-reference.
Verified resources for Bosch Rexroth VT-VRPA2-537-1X/V0/RTP 0811405120:
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Drive a compatible proportional spool valve from an analog machine-control signal.
- Maintain a hydraulic axis using the documented WV60-RGC2 legacy mapping.
- Restore an existing 4WRP 10 E/W control channel without changing its command source.
- Use the amplifier only with the documented 4WRP 10 E/W valve arrangement.
- Confirm that material number 0811405120 matches the installed Rexroth card.
- Treat WV60-RGC2 as a legacy mapping that still requires a full nameplate comparison.
- Command polarity determines the direction of the proportional output current.
- The 3.7/50 selection must correspond to the connected valve coil requirement.
- Zero and gain checks should be completed before closed-loop operation resumes.
- The amplifier supplies controlled coil current rather than dissipating power in a simple resistor interface.
- Correct adjustment allows the valve to follow the controller command without unnecessary saturation.
- Stable 24 V DC power helps preserve repeatable hydraulic response across the operating cycle.