Rexroth VT-HACD-1-12/V0/1-0-0 R978005518 Spare Part

Rexroth VT-HACD-1-12/V0/1-0-0 R978005518 Service-Ready Spare Part for Industrial Maintenance

The Bosch Rexroth VT-HACD-1-12/V0/1-0-0, carrying material number R978005518, is a digital hydraulic axis controller card designed for closed-loop position, velocity, and force control in demanding industrial hydraulic systems. This controller card is widely deployed in press lines, injection moulding machines, metal forming equipment, test rigs, and heavy-duty manufacturing cells where precise hydraulic actuation is critical to product quality and process repeatability. As original equipment reaches end-of-service milestones, maintaining a verified spare in the maintenance inventory becomes a direct risk-management decision — unplanned downtime caused by a failed axis controller can halt an entire production line within minutes.

The VT-HACD-1-12/V0/1-0-0 interfaces directly with Rexroth proportional valves and servo-hydraulic valves, providing the command signal conditioning, feedback processing, and closed-loop PID regulation that keeps hydraulic cylinders and motors operating within tight tolerance bands. Maintenance engineers replacing this card must confirm the supply voltage rail (typically ±15 VDC or 24 VDC depending on rack configuration), verify the enable signal wiring from the machine PLC, and check that the analog command input — usually ±10 V from the motion controller or CNC — is correctly routed to the card’s input terminals. Any mismatch in signal polarity or scaling will result in runaway or no-motion faults immediately upon commissioning.

When sourcing a replacement VT-HACD-1-12/V0/1-0-0 R978005518, procurement engineers should confirm the exact firmware variant (V0/1-0-0) to ensure parameter compatibility with the existing machine configuration. Rexroth axis controller cards store gain settings, ramp times, and limit values in onboard memory; if the replacement card ships with factory defaults, the commissioning engineer must re-enter all parameters from the original machine documentation or perform a full re-tuning sequence. Retaining a copy of the parameter set — either from the Rexroth IndraWorks commissioning software or from a manual parameter printout — is strongly recommended before the failed card is removed from service.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

A structured maintenance plan for hydraulic control systems using the VT-HACD-1-12/V0/1-0-0 should extend beyond the controller card itself. During any scheduled inspection or corrective maintenance event, the maintenance team should simultaneously evaluate the condition of the associated Rexroth VT-VSPA2-1 proportional amplifier cards, which drive the proportional directional control valves connected to the same hydraulic axis. Amplifier card degradation — evidenced by unstable valve response or increased current ripple — often precedes or accompanies axis controller faults.

The 24 VDC power supply feeding the controller rack deserves particular attention. A Rexroth or equivalent industrial DIN-rail power supply with sufficient current headroom (typically 5–10 A for a multi-card rack) should be verified for output voltage stability under load. Voltage sag or ripple on the supply rail is a common root cause of intermittent axis controller faults that are difficult to reproduce during bench testing. Replacing the power supply as a precautionary measure during a planned shutdown is far less costly than an unplanned failure during production.

Terminal block wiring at the card rack should be inspected for loose connections, oxidation, and correct torque on screw terminals. The feedback transducer cable — whether a linear position transducer (LDT/LVDT) or an SSI encoder — should be checked for shield continuity and connector integrity. A damaged or poorly shielded feedback cable introduces noise into the closed-loop, causing hunting, oscillation, or position drift that is often misdiagnosed as a controller card fault. Similarly, the analog command cable from the machine PLC or CNC output module should be routed away from high-voltage power cables to prevent induced interference.

For machines using PROFIBUS-DP communication to the hydraulic axis controller, the PROFIBUS termination resistors at both ends of the segment should be verified, and the GSD file version should match the firmware variant of the replacement card. A mismatch in GSD configuration can prevent the PLC from establishing communication with the new card, resulting in a communication fault that halts the axis. Keeping a current backup of the PLC program — including the PROFIBUS hardware configuration — is essential before any card replacement is attempted.

Additional components that should be reviewed during the same maintenance window include the Rexroth VT-SWKA-1 setpoint card (if used for manual override or ramp generation), the VT-NE31 fieldbus node card for multi-axis communication, and any Rexroth HNC100 or HNC101 hydraulic axis controllers used in adjacent axes of the same machine. Fuse holders and blade fuses protecting the card rack supply rails should be inspected and replaced on a scheduled basis — a blown fuse is a symptom, not a root cause, and the underlying overcurrent condition must be identified. Signal isolators between the PLC analog output and the controller card input are also worth checking; degraded isolation can introduce ground loops that corrupt the command signal.

Site Replacement Workflow

Before removing the failed VT-HACD-1-12/V0/1-0-0 R978005518 from the rack, the maintenance engineer should document all DIP switch settings, potentiometer positions, and any visible LED status indicators. Photograph the card front panel and terminal wiring before disconnection. Power down the rack using the correct isolation procedure — confirm that the hydraulic axis is in a safe, de-energised state and that the machine safety circuit (E-stop relay, safety relay module) has been engaged to prevent unintended valve actuation during the swap.

Remove the card carefully from the Euro-card rack, noting the card slot position. Insert the replacement VT-HACD-1-12/V0/1-0-0 into the same slot and restore all wiring connections. Before powering up, verify supply voltage at the rack bus connector with a multimeter. Power up the rack and observe the card’s LED indicators — a healthy card should show a green power LED and, after enable signal application, a green enable LED. If the card supports parameter upload via a serial interface or PROFIBUS, restore the saved parameter set before enabling the axis.

Commission the axis at reduced speed and reduced pressure first, confirming that the position feedback signal is reading correctly and that the valve responds in the correct direction. Gradually increase the command amplitude and verify that the axis tracks the setpoint within the specified tolerance. Log the commissioning results and update the machine maintenance record. The entire replacement and recommissioning process, when well-prepared, can typically be completed within two to four hours, minimising production downtime to a single shift or less.

Spare Parts Support FAQ

Q1: Is the VT-HACD-1-12/V0/1-0-0 R978005518 a new or refurbished unit?
All units supplied by NINERMAS are either new old stock (NOS) or fully tested surplus. Each card undergoes a pre-shipment functional test to verify power-up, signal response, and communication integrity. A 12-month warranty from the shipment date covers any manufacturing or functional defects identified during normal operation.

Q2: Can this card replace an older VT-HACD variant with a different firmware suffix?
Firmware variants within the VT-HACD-1-12 family may differ in parameter structure and communication options. Before ordering, confirm the exact variant code (V0/1-0-0) against your machine documentation. If the variant differs, our technical team can advise on parameter migration and compatibility. In many cases, a cross-variant replacement is feasible with parameter re-entry, but this should be confirmed before installation.

Q3: What is the typical lead time and do you maintain stock?
NINERMAS maintains a dedicated inventory of Rexroth VT-HACD series controller cards to support urgent maintenance requirements. Standard lead time for in-stock units is 3–5 business days for international shipment. For customers with recurring maintenance needs, we offer long-term supply agreements and reserved stock programmes to ensure availability when critical spares are needed most.

Q4: What documentation is provided with the shipment?
Each shipment includes a test report confirming pre-shipment functional verification, a packing list, and a warranty certificate valid for 12 months from the shipment date. Upon request, we can provide the Rexroth product datasheet and, where available, the commissioning parameter template for the VT-HACD-1-12/V0/1-0-0 to support your on-site installation team.