Current and voltage measurement in industrial automation
In modern industrial automation systems, current and voltage signals are fundamental to equipment control, condition monitoring, and safety protection. PLC control cabinets, servo drives, general-purpose inverters, welding power supplies, and welding robots all require stable and accurate electrical measurement signals.
Current and voltage transducers, closed-loop Hall current sensors, and open-loop Hall current sensors convert complex field electrical signals into standard signals that industrial control systems can recognize. This helps equipment improve control accuracy, operating reliability, and maintenance efficiency.
Industrial control
In industrial control systems, current and voltage transducers provide isolated measurement of AC or DC current and voltage and output 4-20 mA, 0-5 V, or digital signals for PLCs, DCS, SCADA systems, industrial PCs, and data acquisition modules.
A 4-20 mA signal has strong immunity to interference and is suitable for long-distance transmission in complex industrial environments. A 0-5 V signal has a simple interface and intuitive response, making it suitable for internal equipment control and short-distance acquisition. Digital signals make system integration, data logging, and remote monitoring easier.
These products are widely used for equipment operation monitoring, busbar voltage and load current detection, industrial power monitoring, overload and undervoltage protection, and factory energy management.
- Motors, pumps, fans, and compressors
- Control cabinet busbar voltage and load current
- Heating equipment, electrolysis equipment, and industrial power supplies
- Overload, underload, overvoltage, and undervoltage protection
- Factory energy management and condition-based maintenance
Servo drives and variable-frequency drives
AC servo amplifiers and general-purpose inverters both need real-time motor current detection. Current feedback is used for overcurrent, short-circuit, and overload protection, and it also participates directly in torque control, speed control, and vector control.
Closed-loop Hall current sensors use a compensation measurement principle. They provide high accuracy, strong linearity, fast response, and excellent temperature stability, making them suitable for high-performance motor-control systems such as servo drives and variable-frequency drives.
In robotics, CNC machines, packaging machinery, conveying systems, fans, pumps, and compressors, accurate current detection helps drive systems run more smoothly, respond faster, and achieve higher control precision.
- Three-phase motor current detection
- DC bus current detection
- Servo torque closed-loop control
- Inverter output current feedback
- IGBT power module protection
- Stall, phase-loss, short-circuit, and overload detection
Welding equipment and welding robots
Welding current directly affects arc stability, penetration, weld formation, and weld quality. In arc welding equipment and welding robots, real-time welding current monitoring is important for stable welding and traceable quality control.
Open-loop Hall current sensors have a compact structure, fast response, and cost advantages, which make them suitable for high-current, high-interference, and space-constrained welding applications. They can provide non-contact isolated measurement at the welder output or main power circuit and feed the signal back to the control system.
In automotive manufacturing, construction machinery, metal-structure fabrication, and automated welding lines, reliable current monitoring improves welding consistency, reduces rework, and increases production efficiency.
- Real-time welding current monitoring
- Constant-current control feedback
- Arc start, arc stop, and arc break detection
- Arc instability, short-circuit, and spatter abnormality detection
- Welding parameter recording and quality traceability
- Welding robot process control and optimization
PowerUC advantages in industrial automation
Multiple output signals for easy integration
Products can support 4-20 mA, 0-5 V, +/-4 V, 2.5 V +/-0.625 V, RS485, MQTT, and other digital outputs. They can be connected to PLCs, SCADA systems, industrial data acquisition platforms, and analog/digital conversion devices.
Stable operation in complex environments
PowerUC products are designed for environments with electromagnetic interference, high-power switching, temperature variation, and continuous operation.
Product coverage for different automation needs
Available solutions include current transducers, voltage transducers, closed-loop Hall current sensors, open-loop Hall current sensors, and high-current welding sensors.
Configurable for system requirements
Products can be selected by measurement range, output signal, installation method, accuracy class, and system architecture to support industrial control, motion control, and welding automation.
