The (MNR: R901054664) is a high-performance digital servo amplifier card from the Bosch Rexroth HACD family. Specifically engineered for closed-loop control of hydraulic axes, this module provides precise positioning, pressure, and force regulation. It is a critical component for industrial machinery requiring high dynamics and accuracy, integrated via fieldbus (Profibus DP) for advanced motion control.

Technical Specifications

• Model Name: VT-HACD-DPQ-1-20/V0/1-0-0
• Material Number (MNR): R901054664
• Dimensions: 100 mm (W) x 160 mm (H) x 120 mm (D) – Eurocard format
• Weight: 0.65 kg
• Origin: Germany
• Operating Temperature: 0°C to +50°C
• Supply Voltage: 24V DC (nominal)

 

Mechanical Installation Requirements

🔧 Mounting Method: This card is designed for insertion into a standard 19-inch rack (Eurocard sub-rack). It must be locked into the backplane using the integrated front-panel levers. 📏 Space Clearance: Maintain a minimum clearance of 30 mm above and below the card rack to facilitate airflow. 🔥 Heat Dissipation: The unit relies on convection. Ensure the control cabinet features top-mounted exhaust fans. Avoid placement directly above high-heat components like variable frequency drives or large power supplies.

 

Electrical Wiring Specifications

⚡ Terminal Definition: The card utilizes a 48-pin DIN 41612 connector (Type F). Pins are grouped for power supply, command signals (analog inputs), valve outputs, and encoder feedback. 🧵 Cable Gauge: Use shielded, twisted-pair control cable with a minimum cross-section of 0.5 mm² for signals. Use 1.0 mm² for 24V DC power supply lines to ensure voltage stability. 🌍 Grounding Norms: The board’s shield must be connected to the cabinet’s central star-ground point via the backplane frame. Use a low-impedance braided copper strap for the best EMI protection.

 

Communication Configuration Steps

⚙️ IP Address: As a Profibus DP device, this module does not use an IP address. Instead, it utilizes a Station ID (Address). 🆔 Station Number: Configure the station address (0–126) via the onboard DIP switches or through the Rexroth BODAC software interface. 📡 Baud Rate: The device automatically detects Profibus baud rates up to 12 Mbps. Ensure the line is terminated correctly at both ends of the bus segment with 220Ω resistors.

 

Frequently Asked Questions (Q&A)

❓ The “Error” LED is solid red. What does this mean? A: This usually indicates a loss of feedback signal from the transducer (e.g., LVDT or encoder) or a supply voltage drop below 18V. Check your feedback cable shielding and terminal tightness. ❓ How can I perform the initial commissioning? A: Use the Rexroth BODAC software connected via the front-panel serial (RS-232) or fieldbus interface to define the axis parameters and run the auto-tuning sequence. ❓ Can I use this for non-hydraulic applications? A: No. The firmware is specifically optimized for hydraulic valve control curves (e.g., non-linear flow compensation); it is not suitable for electric motor drives.