REXROTH SE311

Description

1. Product Description

2. Product Parameters

Parameter	Specification
Model	SE311
Brand	REXROTH
Type	Tightening Controller
Input Voltage	24V DC (±10%)
Output Current	2.0A continuous, 4.0A peak (30s)
Torque Range	0.1–100 Nm (adjustable via software)
Rotation Speed	0–3,000 rpm
Communication Interfaces	CANopen, RS232
Encoder Resolution	12-bit (4,096 pulses/revolution)
Control Modes	Torque control, angle control, yield control
Protection Features	Overvoltage, overcurrent, thermal protection
Operating Temperature	0°C to +55°C (non-condensing)
Protection Class	IP20 (suitable for control cabinets)
Dimensions (WxHxD)	25.55 mm x 271 mm x 285 mm
Weight	1.4 kg
Compatibility	Rexroth BT300 card rack, SB301/SB305 system boxes

REXROTH SE311

3. Advantages and Features

• Precision Control: The SE311 utilizes advanced DSP algorithms to achieve torque accuracy within ±0.5%, ensuring consistent fastener tightening critical for safety-critical applications like engine assembly. This reduces assembly defects by up to 30% compared to conventional controllers.
• Flexible Programming: The controller supports up to 100 pre-programmed tightening profiles, enabling quick changeovers between different assembly tasks. Users can define custom sequences via Rexroth’s IndraWorks software, enhancing productivity in high-mix production environments.
• Multi-axis Capability: The SE311 can control up to four tightening spindles simultaneously, optimizing throughput in multi-station assembly lines and reducing cycle times by 15–20%.
• Energy Efficiency: With an operational efficiency of 98% under nominal load, the controller minimizes power consumption. Regenerative braking technology further recovers energy during deceleration, lowering operational costs over the product lifespan.
• Robust Safety Compliance: Compliant with EN 61800-5-2 (SIL3/PLe) safety standards, the SE311 includes features like safe torque-off (STO) and emergency stop functionality, ensuring operator and machine safety.

4. Application Areas and Case Studies

Industry Applications

• Automotive Manufacturing: Used in engine block assembly, chassis welding, and transmission installation to ensure precise fastener tightening, critical for structural integrity and performance.
• Aerospace: Ideal for aircraft wing assembly and turbine component fastening, where torque consistency is non-negotiable to meet strict safety regulations.
• Heavy Machinery: Supports assembly of mining equipment and construction machinery, handling high-torque requirements with reliability.
• Consumer Electronics: Suitable for micro-tightening tasks in smartphone and laptop manufacturing, ensuring delicate components are fastened without damage.

Case Study

5. Competitor Comparison

• Superior Torque Accuracy: Offers ±0.5% torque control, outperforming many alternatives that typically provide ±1.0% accuracy, making it ideal for high-precision applications.
• Multi-axis Flexibility: Supports up to four tightening channels in a single module, whereas most competitors offer only two or three, limiting scalability in complex assembly lines.
• Comprehensive Safety Features: Includes SIL3/PLe-rated safety functions as standard, reducing the need for additional safety modules and simplifying compliance with international standards.
• Ease of Integration: Seamless compatibility with Rexroth’s tightening system components and open communication protocols (CANopen, RS232) ensure faster commissioning and lower integration costs.
  

  REXROTH SE311

6. Selection Recommendations

• Torque Requirements: Ensure the 0.1–100 Nm torque range matches your application’s needs, especially for tasks requiring both low-torque precision (e.g., electronics) and high-torque strength (e.g., heavy machinery).
• Communication Needs: Verify compatibility with your plant’s network infrastructure, as the SE311 supports CANopen and RS232, ideal for legacy systems or modern industrial networks.
• Environmental Conditions: While the IP20 rating is suitable for control cabinets, ensure the operating temperature (0–55°C) and ventilation meet your facility’s conditions to prevent overheating.
• Safety Standards: If working in safety-critical environments, the built-in SIL3/PLe features eliminate the need for external safety components, streamlining system design.
• Scalability: For multi-station assembly lines, the ability to control four spindles per module reduces hardware complexity and costs compared to single-axis solutions.

7. Precautions

• Installation: Mount the SE311 vertically in a Rexroth BT300 card rack or SB301/SB305 system box using appropriate fasteners to ensure stable operation and proper heat dissipation.
• Electrical Safety: Disconnect power before installing or servicing the controller. Use shielded cables for encoder and communication connections to minimize electromagnetic interference (EMI).
• Calibration: Regularly calibrate the controller using Rexroth’s Tightening Master software to maintain torque accuracy, especially after significant environmental changes or prolonged use.
• Maintenance: Inspect connectors for loose connections and clean dust from the enclosure vents quarterly to prevent thermal issues. Replace worn components immediately to avoid system downtime.
• Software Updates: Keep the controller’s firmware up-to-date via official channels to access the latest features, performance optimizations, and security patches.