The CENTRAX CU3000 combines the functionality of a highly accurate instrument for heavy current applications with the possibilities of a freely programmable Soft-PLC in one housing. The connection of the process environment may be performed by communication interfaces, via digital I/Os, analog outputs or relays.

PLC functionality

• Based on Codesys, 3 performance classes
• BASIC: Flexible processing of the data of the measurement device using the complete I/O functionality
• ADVANCED: BASIC + Modbus RTU/TCP master and time-dependent processes
• PROFESSIONAL: ADVANCED + self-defined websites and local visualizations + Codesys data logger

Condition monitoring

• Provision of all voltages, currents, powers, power factors
• Variance of system variables with time reference
• Measurements of Modbus slaves

Energy flow analysis

• Power mean-values with trend-analysis for preventing load-peaks
• Load profile storage with fluctuation range (min/max) per interval
• Active energy class 0.2S, Reactive energy class 0.5S (HT/LT, demand/delivery), configurable resolution
• Further mean-values and meters with selectable base quantity

Power quality analysis

• Harmonic analysis acc. IEC 61000-4-7
• Assessment of voltage and current imbalance
• Phasor and phase sequence display for connection check
• Waveform display
• Optional disturbance recorder for PQ events (voltage dip, swell, interruption) acc. IEC 61000-4-30 Ed.3 with RMS1/2 and waveform recordings

Hardware options

Up to 4 modular extensions: Analog outputs ±20mA (2/4), relay outputs (2), digital inputs (4) active / passive, GPS time synchronization, fault-current monitoring (residual or earth current), temperature monitoring (Pt100, PTC), IEC61850

Communication

• Ethernet (Modbus/TCP, http/https, NTP, SFTP, SYSLOG)
• Modbus/RTU master or slave
• Optional: IEC61850
• Scheduled data export to SFTP server

Security

• Flexible Role Based Access Control
• Encrypted communication via HTTPS
• Audit Log records all security related procedures, support for SYSLOG for transfer to central network monitoring server
• Client whitelist: IP address list for restricting authorized computers
• Digital firmware signature: Prevents that manipulated firmware gets into the device via update

Further features

• 4 current and 4 voltage channels with 0.1% accuracy, direct measurement or via transformers
• Measurement category 600V, CAT III (voltage), 300V,CAT III (current)
• Standard IOs: 1 digital input, 2 digital outputs
• Optional UPS (5×3 minutes)
• Data logger with16 GB data memory (option)
• Sampling rate: 18kHz
• Monitoring and alarming via limit values and monitoring functions
• For panel mounting 144x144mm
• Identical operation as devices of the AM/PQ/DM series