Bosch Rexroth VT-HNC100-1-14/134 Axis Controller – HNC100 Series

Bosch Rexroth VT-HNC100-1-14/134 — Closed-Loop Digital Axis Controller for Electrohydraulic Drive Systems

The VT-HNC100-1-14/134 is a single-axis digital controller within Bosch Rexroth’s HNC100 platform, purpose-built for closed-loop electrohydraulic positioning, velocity, and force regulation. Unlike general-purpose motion controllers, this module is architected around the signal chain of proportional and servo hydraulic valves, embedding all necessary control mathematics, ramp management, and diagnostic logic into a compact DIN-rail-mountable enclosure. Its role in a hydraulic control loop is unambiguous: it sits between the supervisory PLC and the valve amplifier, translating high-level setpoints into precisely conditioned ±10 V analog commands while continuously comparing actual-value feedback to maintain loop closure at sub-millisecond cycle rates.

For procurement engineers sourcing a verified replacement or OEM integrators specifying a new axis, the VT-HNC100-1-14/134 eliminates the need for external PID hardware, discrete ramp generators, and separate limit-monitoring relays. All of these functions are consolidated within the module’s firmware, reducing panel wiring complexity and commissioning time measurably.

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Technical Parameters

Hardware Logical Analysis

The VT-HNC100-1-14/134 is built around a fixed-point DSP core executing the closed-loop algorithm at a deterministic 1 ms cycle. The analog front-end uses differential input amplifiers with common-mode rejection ratios exceeding 60 dB, which is critical in hydraulic machine environments where long cable runs between the transducer and the controller introduce significant common-mode noise from motor drives and solenoid switching transients.

The ±10 V command and feedback paths are routed through 12-bit ADCs with hardware anti-aliasing filters set below the Nyquist frequency of the control loop. This prevents aliased high-frequency noise from corrupting the error signal and causing limit-cycle oscillations in the valve — a failure mode that is particularly destructive in high-flow proportional valves where spool dither amplitude must be tightly controlled.

EMC hardening is implemented at the PCB level: signal ground planes are isolated from the 24 V power ground via a single-point star connection, suppressing ground loop currents that would otherwise appear as DC offset errors in the feedback path. Transient voltage suppressors (TVS diodes) are placed on all I/O terminals, rated to clamp inductive spikes from solenoid coils and relay contacts to within the safe operating area of the input amplifiers.

The ramp generator is implemented in firmware as a second-order profile with configurable acceleration and deceleration slopes, preventing step-change setpoints from exciting the mechanical resonance of the hydraulic cylinder and load mass. The derivative term of the PID includes a first-order low-pass filter with an adjustable time constant, allowing the engineer to trade off derivative action against noise amplification — a necessary compromise in hydraulic systems where transducer resolution is finite and quantization noise is non-negligible.

Fault detection logic monitors the following conditions in real time: supply voltage out of range, feedback signal loss (open-circuit transducer), output saturation duration exceeding a configurable timeout, and enable signal de-assertion. Each fault condition latches a specific fault code readable via the serial interface, enabling root-cause diagnosis without oscilloscope access to the analog signal chain.

System Integration Benefits

• Deterministic 1 ms loop closure: The fixed-cycle DSP execution guarantees that position error correction is applied within one millisecond of any setpoint or disturbance change, providing the repeatability required for hydraulic CNC contouring applications.
• Elimination of external PID hardware: All proportional, integral, and derivative gains are stored in non-volatile memory within the module, removing the drift and vibration sensitivity of potentiometer-based analog PID boards.
• Native Rexroth valve compatibility: The ±10 V output scaling is factory-matched to Rexroth 4WRPH, 4WRKE, and servo valve amplifier input ranges, eliminating gain-matching calculations during commissioning.
• Software parameterization without hardware jumpers: All control parameters — gains, ramp slopes, limit thresholds, enable polarity — are set via WinHNC/BODAC over RS-232, enabling parameter backup, version control, and remote configuration without opening the control cabinet.
• Structured fault transparency: Latched fault codes with serial readout reduce mean time to repair (MTTR) by directing maintenance personnel directly to the fault source rather than requiring signal tracing across the analog chain.
• Feedforward gain path: A configurable feedforward term compensates for the steady-state valve flow gain, reducing the integral windup required to overcome valve deadband and improving dynamic stiffness of the position loop.
• Configurable output limiting: The valve command output can be clamped to a user-defined percentage of full scale, preventing over-travel in applications where mechanical end-stops are not present or where slow approach velocity is required near the target position.
• Backward compatibility within HNC100 platform: The VT-HNC100-1-14/134 shares the same mechanical footprint, connector pinout, and parameter structure as other HNC100 sub-variants, allowing direct substitution in existing panels without rewiring or software re-engineering.

Quality Assurance & Global Logistics

Every VT-HNC100-1-14/134 unit supplied by siemensplc.com is sourced through verified distribution channels and subjected to a documented incoming inspection process. The inspection covers physical label integrity (Bosch Rexroth part number, date code, and serial number cross-referenced against manufacturer records), connector condition, and firmware version identification via the serial parameterization port. Units with evidence of counterfeit labeling, unauthorized firmware modification, or physical damage are rejected and not offered for sale.

Shipments originate from our warehouse in Xiamen, China — a logistics hub with direct access to Xiamen Gaoqi International Airport and the Port of Xiamen, both of which maintain scheduled freight services to major industrial destinations in Europe, Southeast Asia, the Middle East, and the Americas. Standard export documentation includes a commercial invoice, packing list, and certificate of origin. For customers requiring IEC or CE compliance documentation, Bosch Rexroth original datasheets and declaration of conformity copies are available upon request.

Transit times for air freight: 3–5 business days to Europe and North America; 2–4 business days to Southeast Asia and the Middle East. Sea freight options are available for bulk orders. All shipments are tracked from dispatch to delivery, with tracking numbers provided within 24 hours of collection by the carrier. The 12-month warranty covers functional failure under normal operating conditions; dead-on-arrival (DOA) units are replaced at no charge upon return and inspection.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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