Description
Bosch Rexroth R901066987 VT-VRPD-2-2X/V0/0-0-1 Digital Valve Amplifier
Product Introduction
The Bosch Rexroth R901066987 VT-VRPD-2-2X/V0/0-0-1 is a digital valve amplifier designed for proportional directional valves with electrical position feedback. Bosch Rexroth documentation specifies this exact material number for the VT-VRPD-2 series and identifies the compatible hydraulic valves as 4WRE 6…2X and 4WRE 10…2X. The amplifier operates as a closed-loop controller, processing the command signal and valve-position feedback before driving the two proportional solenoids. This makes it a hydraulic motion-control component rather than a conventional PLC analog output card.
The Bosch Rexroth R901066987 VT-VRPD-2-2X/V0/0-0-1 uses a 24 VDC supply and supports command-value inputs through voltage or current interfaces. The documented configuration provides three voltage command inputs, including differential inputs, as well as a 4–20 mA command interface. It can store multiple parameterized command values, with the documented version supporting up to 16 callable parameter sets. A front-side RS-232 interface is used for parameterization and diagnosis with Bosch Rexroth BODAC software, while a local bus allows up to 32 valve amplifiers to be interconnected.
The Bosch Rexroth R901066987 VT-VRPD-2-2X/V0/0-0-1 includes its own valve output stage and is explicitly intended for valves with two solenoids. Maximum solenoid current is specified at 2.5 A. The card uses a Eurocard design and a 64-pin DIN 41612 Form G connector, allowing installation in specified Bosch Rexroth card holders and racks. For maintenance teams, the critical compatibility checks are the exact 4WRE valve type, component series, feedback arrangement, command-signal configuration, and BODAC parameter set.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | VT-VRPD-2-2X/V0/0-0-1 |
| Material Number | R901066987 |
| Manufacturer | Bosch Rexroth |
| Product Type | Digital proportional valve amplifier |
| Control Function | Closed-loop proportional valve control with electrical position feedback |
| Compatible Valve Types | 4WRE 6…2X, 4WRE 10…2X |
| Component Series | 2X |
| Nominal Supply | 24 VDC |
| Supply Range | 21–30 VDC |
| Maximum Current Consumption | 1.5 A |
| Fuse | 4 A time-lag |
| Voltage Command Inputs | 3 |
| Voltage Command Range | 0–10 V differential input |
| Current Command Input | 4–20 mA |
| Current Input Resistance | 100 Ω |
| Digital Inputs | 4 / 16 signal capability as documented for parameter call-up |
| Digital Input Low | 0–5 V |
| Digital Input High | 16 V to supply voltage |
| Analog Output | 0–10 V |
| Analog Output Resolution | 1.25 mV / 14 bit |
| Solenoid Outputs | 2 |
| Maximum Solenoid Current | 2.5 A |
| Solenoid Coil Resistance | 2.7 Ω cold / 4.5 Ω maximum hot value |
| Position Feedback Carrier Frequency | 5.7 kHz |
| Ramp Time | 0–300 s |
| Serial Interface | RS-232, front D-Sub |
| Local Bus | Up to 32 amplifiers / maximum 280 m line length |
| Parameterization | BODAC PC software |
| Backplane Connector | 64-pin DIN 41612, Form G |
| Mounting Format | Eurocard |
| Operating Temperature | 0 to +50°C |
| Storage Temperature | −20 to +70°C |
| Weight | Approx. 0.2 kg |
| Protection Rating | Not specified for the bare Eurocard |
| Communication Protocol | Local service/parameterization interface; not a general-purpose PLC network interface |
Technical values are based primarily on Bosch Rexroth document RE 30126 for the VT- component series.
R901066987 – VT-VRPD-2-2X/V0/0-0-1
Main Features and Engineering Considerations
Closed-loop proportional valve control
The VT- is intended for proportional valves equipped with electrical position feedback. It does more than amplify a PLC command: the electronics process the command value, compare it with the valve’s actual position, and control the proportional solenoids accordingly.
Designed for 4WRE valves
The exact ordering code specifies amplifier type 2, corresponding to the 4WRE 6…2X and 4WRE 10…2X valve families. This is one of the most important procurement checks. A visually similar VT-VRPD or VT-VPCD amplifier should not automatically be treated as interchangeable.
24 VDC control power
The supply is nominally 24 VDC, with Bosch Rexroth documentation specifying an operating range of 21–30 VDC and maximum current consumption of 1.5 A. The amplifier also specifies a 4 A time-lag fuse.
Flexible command-value interfaces
The card accepts voltage and current command signals. The documented voltage inputs operate from 0–10 V, while the current command input is 4–20 mA with 100 Ω input resistance. This allows integration with different machine-control architectures without requiring an external signal converter.
Parameter sets and ramp generation
The controller can store callable parameter sets and provides ramp-time adjustment from 0 to 300 seconds. Four digital inputs are used for binary command-value call-up. This is useful where a hydraulic machine needs predefined motion profiles rather than one continuously variable command.
Diagnostics and configuration
The front-side RS-232 interface is intended for PC-based configuration and diagnosis through BODAC. Bosch Rexroth also documents a local bus capable of interconnecting up to 32 valve amplifiers.
Built-in valve output stage
The final “-1” in the ordering code indicates the version with valve output stage. Bosch Rexroth explicitly warns that this configuration is suitable only for valves with two solenoids.
Application Scenarios
Hydraulic Presses
The VT- can be used to control proportional hydraulic motion where valve position feedback is required for controlled actuator movement.
Automated Hydraulic Machinery
The amplifier is suited to machinery requiring repeatable proportional valve positioning, configurable ramps, and multiple predefined command values.
Test and Control Equipment
Its closed-loop feedback architecture and diagnostic interface make it appropriate for hydraulic test benches where command and actual valve position need to be monitored and controlled.
Industrial Motion Systems
The 4WRE valve compatibility makes this amplifier relevant to industrial hydraulic systems using proportional directional control valves in the 4WRE 6 and 4WRE 10 families.
Engineer’s Guide: Field Pitfalls
Pitfall 1 — Treating it as a standard analog output module
It is not simply a 4–20 mA or 0–10 V output card. The VT-VRPD performs valve-specific closed-loop control and directly drives proportional solenoids.
Pitfall 2 — Ignoring the valve feedback
The amplifier is designed for valves with electrical position feedback. Verify the feedback transducer wiring and carrier-frequency arrangement before replacing the amplifier.
Pitfall 3 — Using the wrong valve family
The documented configuration is for 4WRE 6…2X and 4WRE 10…2X. Check the complete valve nameplate, not just the nominal valve size.
Pitfall 4 — Losing the original BODAC parameters
A replacement amplifier may power up correctly but still produce incorrect hydraulic motion if its parameterization does not match the machine. Preserve the original configuration before replacement whenever possible.
Pitfall 5 — Confusing the 24 V supply with the solenoid voltage
The 24 VDC rating is the amplifier’s supply. The internal valve output stage controls the proportional solenoids and has its own current specification.
Pitfall 6 — Forgetting the “-1” ordering-code suffix
The final “1” denotes the version with a valve output stage. Bosch Rexroth specifically states that this configuration is intended for valves with two solenoids.
Pitfall 7 — Assuming modern communication compatibility
The documented service interface is RS-232, with a local bus for amplifier interconnection. It should not be treated as an Ethernet, PROFIBUS, or standard PLC communication module.
Frequently Asked Questions
What is Bosch Rexroth R901066987?
is the material number for VT–2X/V0/0-0-1, a digital valve amplifier for proportional directional valves with electrical position feedback.
Which valves are compatible?
The Bosch Rexroth documentation specifies 4WRE 6…2X and 4WRE 10…2X proportional directional valves.
What is the supply voltage?
The nominal supply is 24 VDC, with a documented operating range of 21–30 VDC.
What command signals are supported?
The amplifier supports voltage command inputs in the 0–10 V range and a 4–20 mA command input.
What is the maximum solenoid current?
The documented maximum solenoid current is 2.5 A.
Does it communicate with a PLC?
The card has an RS-232 interface for parameterization and diagnosis and a local bus for interconnecting multiple amplifiers. It is not a conventional PLC communication module.
What software is used for configuration?
Bosch Rexroth specifies BODAC for parameterization and diagnosis.
What is the mounting format?
It is a Eurocard-format electronic assembly using a 64-pin DIN 41612 Form G connector. Bosch Rexroth specifies several compatible card holders, including the VT 12302 and VT 3002-2X/64G.
Procurement Note
For a replacement order, specify the complete identifier:
Bosch RexroVT-/V0/0-0-1
Do not shorten the specification to “VT-” during procurement. The complete ordering code identifies the valve family, component series, standard version, display configuration, and presence of the valve output stage.
For a used or refurbished unit, request photographs of the actual front label, PCB, connector, and revision markings. The most important technical checks are the 4WRE 6/10 valve compatibility, two-solenoid output stage, electrical position feedback, BODAC parameterization, 24 VDC supply, and 64-pin DIN 41612 connection.
The Bosch Rexroth documentation also identifies the required BODAC software and compatible card holders, which is useful when the existing machine’s rack hardware is being retained.
