REXROTH VT-HNC100-1-23/W-08-C-0 (R900959000) – Digital Hydraulic Axis Controller for Precise Electrohydraulic Motion

The REXROTH VT‑HNC100 series is widely used when a standard PLC isn’t quite enough for smooth hydraulic motion. This specific variant, VT‑HNC100‑1‑23/W‑08‑C‑0 (material no. R900959000), is a compact digital axis controller designed for closed-loop position, pressure, and force control on electrohydraulic axes. From my experience, it’s typically paired with proportional or servo valves and makes it simpler to achieve consistent repeatability without overengineering the PLC program. You might notice that the “C” variant indicates CANopen fieldbus, which is a common choice in hydraulic retrofits and new machine builds alike.

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• Warranty: 365 days
• Lead time: 1 week for in-stock items; no more than one month at the latest
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Key Features

• Dedicated hydraulic axis control – Purpose-built closed-loop control for position, pressure, or force with proportional/servo valves, reducing PLC complexity.
• Flexible feedback options – Supports common transducers and encoder formats used in hydraulics (SSI or incremental encoders and analog sensors, depending on variant).
• Analog command outputs – Typically ±10 V command for valve control, enabling smooth motion with fine tuning.
• Fieldbus connectivity – “C” variant appears to be CANopen, so integration to existing networks is usually straightforward.
• 24 VDC cabinet electronics – Standard industrial 24 VDC supply makes panel integration simple.
• PC-based commissioning – Parameter setting, tuning, and backup through service/serial connection; saves time during startup and service.
• Robust diagnostics – Status LEDs, fault codes, and parameter logs help maintenance teams resolve issues quickly.

Technical Specifications

Application Fields

This controller is usually chosen for machines where hydraulic motion must be precise and repeatable:

• Hydraulic presses and metal forming (position/force control)
• Injection molding, die casting, and clamping axes
• Test benches and servo-hydraulic actuators in labs
• Paper, wood processing, and sawmill machinery
• Marine and mobile hydraulic subsystems integrated via CANopen

Advantages & Value

• Reliability in harsh duty – Purpose-built electronics for hydraulics often run cooler and more consistently than improvised PLC loops.
• Compatibility – Works with common Rexroth proportional/servo valves and standard industrial transducers; CANopen eases integration.
• Faster commissioning – Parameter sets, autotuning aids, and service port shorten startup time; backups simplify future maintenance.
• Cost-effective control – In many cases, a dedicated axis controller reduces PLC hardware and engineering hours.
• Global support – Widely used platform with accessible spare parts and know-how.

A maintenance supervisor at a forming plant told me their HNC-based press lines “stayed in spec longer” after switching from a PLC-only loop, especially on hot days when oil conditions drift. That matches what we typically see—less chasing of gains during production.

Installation & Maintenance

• Cabinet conditions – Mount in a clean, ventilated control cabinet (commonly IP54+). Keep ambient typically 0…+50 °C and avoid vibration and moisture.
• Power & grounding – 24 VDC supply with proper earthing. Use separate power feeds for electronics vs. power valves if possible to reduce noise.
• Wiring – Use shielded cables for sensors/encoders. Keep analog lines away from motor/solenoid cables. Ensure correct valve coil wiring and observe polarity on ±10 V commands.
• Commissioning – Load the correct parameter set, calibrate transducers (e.g., LVDT/pressure), and verify motion limits, ramps, and failsafe states before live operation.
• Routine service – Back up parameters, check terminal tightness, clean cabinet filters, and review fault logs periodically. Firmware updates may be recommended by Rexroth for specific issues or enhancements.
• Safety – Lock out hydraulic energy, depressurize circuits, and use interlocks for E‑stop and limit switches. Verify safe state behavior via I/O tests.

Quality & Certifications

• CE conformity for industrial environments (manufacturer standard)
• RoHS compliance (typical for Rexroth electronics)
• UL/cUL recognition may apply depending on variant
• Manufacturer quality system typically aligned with ISO 9001
• Warranty: 365 days from shipment

If you’re matching a specific valve, sensor type, or fieldbus master, share those details and we’ll confirm the VT‑HNC100‑1‑23/W‑08‑C‑0 variant fits—or suggest a closest compatible Rexroth alternative for faster delivery.