B&R 8LSA46.R0045D000

Product Introduction:

The B&R 8LSA46.R0045D000 is a high-performance servo drive from the ACOPOS 8L series, engineered for applications demanding ultra-fast dynamic response. The model features a rated current of 45A with a peak current of 135A, making it suitable for medium-to-large servo motors up to 22 kW. It supports multi-turn absolute encoder feedback and all major industrial fieldbus protocols.

Technical Specifications:

Functional Features:

• High-bandwidth current loop at 4 kHz — superior dynamic response
• Electronic gearing with ratios up to 1:1,000,000
• Dual-loop control: Inner current loop + outer position/velocity loop
• Auto-tuning function — automatic identification of motor parameters (inductance, resistance, inertia)
• Vibration suppression with notch filters (up to 8 bands)
• Following error monitoring with configurable limits

Performance Parameters:

Structural Features:

• Larger form factor than 8LSA35 — accommodates higher power IGBT modules
• Integrated braking chopper (external braking resistor required for > 5kW)
• Dual Ethernet ports — one for control network, one for diagnostics/service
• Pluggable terminal blocks: Power (L1/L2/L3), Motor (U/V/W), Encoder (X1/X2), Communication (X3)
• Front-panel LCD display (optional) for parameter monitoring

Working Principle:

The 8LSA46.R0045D000 employs Field-Oriented Control (FOC) with space vector modulation (SVM). The drive’s internal DSP processor executes current control at 4 kHz, ensuring precise torque delivery. The multi-turn absolute encoder provides rotor position with 17-bit single-turn / 12-bit multi-turn resolution, enabling absolute positioning after power loss without homing. The auto-tuning routine injects test signals into the motor to measure electrical and mechanical parameters, which are then used to optimize the PI controllers automatically.

Key Advantages:

• 45A continuous / 135A peak — handles high-inertia loads and rapid acceleration
• 4 kHz current loop — fastest response in the ACOPOS 8L family
• Multi-turn absolute feedback — no homing required after power cycle
• Up to 22 kW motor support — covers wide range of machine sizes
• Notch filter vibration suppression — eliminates mechanical resonance issues

Installation Requirements:

• Mounting: Vertical cabinet mounting — minimum 150mm clearance above and below
• Power Connection: 3-phase 360–750 V DC — cable cross-section min. 10 mm² Cu
• Motor Cable: Shielded servo cable, max 30m (use active extension for longer runs)
• Grounding: PE connection < 0.1 ohm, use star grounding topology
• Cooling: Forced air cooling required above 15 kW — min. 2 m/s airflow
• Braking Resistor: Required for deceleration energy > 500J per cycle

Usage Precautions:

• Braking resistor must be sized for worst-case deceleration energy — undersizing causes DC bus overvoltage fault (F7820)
• Multi-turn encoder battery replacement required every 5 years — loss of battery causes position data loss
• Do not exceed 135A for more than 3 seconds — IGBT thermal protection activates
• EtherCAT cycle time must be ≤ 1 ms for optimal performance — use distributed clocks (DC)
• Perform auto-tuning with motor mechanically decoupled from load for accurate parameter identification