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Help CenterRexroth VT-HNC100-1-23/W-08-S-0 – Electrohydraulic Axis Controller for Precise Position/Force Control
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The Rexroth VT-HNC100-1-23/W-08-S-0 is a compact single-axis controller designed for closed-loop control of hydraulic actuators with servo or proportional valves. It’s typically used where repeatable position, velocity, or pressure/force control is critical—think presses, injection molding retrofits, test benches, or metal forming lines. From my experience, the HNC100 series stands out for stable control behavior and straightforward commissioning via service interface.
Key FeaturesClosed-loop position/pressure control – Tailored for hydraulic axes; supports position, velocity, and pressure/force loops depending on sensor configuration.
Servo/proportional valve drive – ±10 V command output for servo valves and, in many cases, current-controlled outputs for proportional valves (variant-dependent).
Flexible sensor inputs – Typically accepts analog feedback (e.g., LVDT/strain gauge via suitable conditioning) and encoder formats such as incremental or SSI on specific options.
Service-friendly setup – RS232 service port for parameterization and diagnostics; commissioning usually takes less time than a PLC+analog combo for similar tasks.
Eurocard form factor – Fits standard 19" subracks; quick swap-out keeps downtime short in maintenance-heavy environments.
Fieldbus options – Many HNC100 variants support integration via common buses (e.g., PROFIBUS-DP or CANopen); the exact bus depends on the order code.
Robust control algorithms – Tuning tools and proven Rexroth control libraries help achieve stable performance even with varying hydraulic loads.
| Brand / Model | Rexroth VT-HNC100-1-23/W-08-S-0 |
| Function | Single-axis electrohydraulic controller for position, velocity, and pressure/force control |
| Power Requirements | 24 VDC (typ.), low-power electronics; check nameplate/variant for exact rating |
| Form Factor | Eurocard for 19" subrack (3U), DIN 41612 backplane connector |
| Operating Temperature | Typically 0…50 °C (non-condensing), cabinet-mounted |
| Signal I/O | ±10 V analog outputs for valve control; analog/digital feedback channels; encoder support (variant-dependent, e.g., incremental/SSI) |
| Communication | RS232 service interface; optional fieldbus (order-code dependent, e.g., PROFIBUS-DP or CANopen) |
| Installation Method | 19" subrack insertion; wiring via rack backplane and front terminals (depending on subrack) |
You might notice that this controller shows up anywhere precise hydraulic motion matters. Typical applications include:
Hydraulic presses and forming equipment (repeatable position and pressure ramps)
Plastic machinery retrofits (position control on injection or clamping axes)
Test stands and materials testing (force control with fine resolution)
Sawing, cutting, and metal processing lines (synchronized position/velocity)
General-purpose retrofits where a standalone axis controller is faster to deploy than a custom PLC loop
Lower engineering time – Dedicated control functions mean less custom code and faster tuning compared to starting from scratch in a PLC.
Stable control – Rexroth’s hydraulic control know-how typically yields smooth motion and fewer oscillations under varying load.
Easy integration – Eurocard format slots into existing Rexroth VT subracks; fieldbus options keep the architecture open.
Lifecycle support – Widely used in installed bases; spare parts and documentation are generally straightforward to source.
Cost control – In many cases, a single HNC card replaces extra analog modules, motion firmware, and custom PID blocks.
Cabinet & subrack – Install in a ventilated 19" control cabinet; use a compatible Rexroth VT-series subrack with proper grounding and shielding practices.
Wiring – Keep sensor and valve control lines separated from power wiring; use shielded cables for encoders and analog signals, grounded at one end to avoid loops.
Power & safety – 24 VDC supply (typ.); include proper fusing and an emergency stop concept that safely de-energizes the hydraulic actuation.
Tuning – Commission via the RS232 service tool; set sensor scaling, valve parameters, and PID values step-by-step. One thing I appreciate is how the loop reacts predictably when you change gains.
Routine maintenance – Periodically verify sensor calibration, clean connectors, check firmware/parameter backups, and inspect cabinet temperature and fan filters.
CE compliant electronics for industrial control (typical for this Rexroth series)
RoHS conformity in most configurations
UL/CSA recognition may apply to the assembly or components, depending on the subrack and regional variant
Manufacturer warranty: usually 12 months from shipment for standard industrial electronics
For a clean installation, pair the VT-HNC100-1-23/W-08-S-0 with a Rexroth 19" VT-series subrack and a regulated 24 VDC supply module. It also works well with Rexroth proportional valves (e.g., 4WRLE/4WRKE families) when you need fine control. If you’re unsure about sensor compatibility (SSI vs. incremental vs. analog), share your existing transducer part numbers and I’ll match the order code to your setup. A customer in a press line retrofit told me the biggest win was reusing the existing SSI linear scale without changing the mechanics—saved a weekend of downtime.
Disclaimer: Specific I/O and fieldbus options vary by order code. If you have the device label or a photo of the front plate, I can confirm interfaces and power rating within minutes.
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