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B&R 8YS-K0055R0.005-0
Product Name
B&R 8YS-K0055R0 Drive Feedback and Current-Sensing Element, commonly supplied as 8YS-K0055R0.005-0
Product Overview
This component is used inside B&R ACOPOS servo drive systems for precision feedback and current measurement. In the 8YS-K0055R0.005-0 configuration it functions as a low-resistance shunt element; B&R also catalogs 8YS encoder-style feedback units under related 8YS numbers, so the exact card must be confirmed from the drive bill of material.
Detailed content
Technical Specifications
Shunt configuration: 5 mΩ nominal
Power rating: 20 W class for drive-embedded sensing applications
Resistance tolerance: low-drift industrial grade
Temperature coefficient: low PPM/°C rating for stable current measurement
Operating temperature: -25°C to +70°C inside the drive assembly
Storage temperature: -40°C to +85°C
Relative humidity: 5% to 95% non-condensing
Construction: non-inductive geometric layout
Element material: specialized alloy resistive element
Integration: direct ACOPOS internal feedback and current-loop interface
Functional Features
The ultra-low resistance minimizes internal power loss. The non-inductive layout prevents signal distortion from high-frequency PWM switching. The element maintains stable resistance under sustained current and temperature transients. Direct ACOPOS matching removes generic shunt calibration steps.
Application Scenarios
ACOPOS servo drives, industrial inverters, current feedback stages, torque control loops, and precision motion amplifiers requiring accurate phase-current measurement.
Material And Structure
The resistive element uses stabilized alloy mounted on an insulated support with low-thermal-drift bonding. The termination and enclosure are designed for printed-circuit insertion or drive-internal bus connection. The geometry reduces stray inductance.
Working Principle
Motor phase current passes through the low-ohm element and produces a proportional voltage drop. The drive conditioner converts this voltage into current-loop feedback. The controller uses the signal for torque regulation, overcurrent protection, and PWM modulation correction.
Installation Requirements
Install only in the B&R ACOPOS assembly for which the part is specified. Confirm the exact 8YS-K0055R0 suffix before replacement. Observe drive grounding, creepage, and cooling airflow requirements. Use calibrated torque for terminal or PCB mounting as defined by the drive manual.
Usage Precautions
Do not substitute with a generic resistor of similar ohms without verifying inductance, power rating, and insulation. Prevent conformal-coating or debris coverage that changes thermal behavior. Replace the element if the drive reports current-offset faults, calibration errors, or repeated overcurrent trips after wiring verification.
