ABB REM543 CG 218 AAAA Motor Protection Relay

Description

1. Core Overview & Positioning

2. Key Protection & Control Functions

• Electrical Protection:
  • Thermal Overload Protection (TEF):​ Models motor heating based on current, accounting for cooling times and service factor.
  • Short Circuit & Phase Unbalance:​ Instantaneous and time-delayed overcurrent, negative sequence protection.
  • Earth Fault Protection:​ Sensitive directional/non-directional earth fault.
  • Undercurrent / Jam Protection:​ Detects load loss or mechanical jamming.
  • Under/Over Voltage & Frequency Protection.
• Mechanical Protection & Monitoring:
  • Stall Protection:​ Detects locked rotor conditions during start.
  • Number of Starts & Restart Inhibition:​ Limits successive starts to prevent overheating.
  • Bearing Temperature Monitoring:​ Via direct RTD/thermocouple inputs.
  • Vibration Monitoring:​ Via analog input from vibration transmitters.
• Control & Sequencing:
  • Direct Starting:​ Standard start/stop control.
  • Soft Start & Two-Speed Control:​ Configurable logic for various starting methods and multi-speed motors.
  • Programmable Logic (CFC):​ Contains a built-in Configurable Function Calculator (CFC)​ for creating custom control sequences without external PLCs.
• Monitoring & Diagnostics:
  • Comprehensive metering (I, V, P, Q, PF, kWh, operating hours).
  • Motor startup trending and data logging.
  • Event recorder and disturbance recorder with waveform capture.

3. Technical Specifications (Based on ‘CG2 18’ Variant)

• Power Supply:​ The «CG» in the code typically indicates a specific AC/DC auxiliary voltage range​ (e.g., 85-265 V AC/DC). The exact value must be verified on the device nameplate.
• Current Input:​ Typically for 1 A or 5 A​ secondary CTs.
• Binary Inputs/Outputs:​ The «18» and «AAAA» suffixes define the number and type of I/O. It commonly includes:
  • Binary Inputs:​ For status signals (breaker position, external trip, etc.).
  • Output Relays:​ For trip, alarm, and control commands (start/stop, signaling).
• Communication:​ Standard features likely include:
  • Ethernet​ (Modbus TCP/IP, IEC 61850).
  • Serial Ports​ (RS-485 for Modbus RTU, Profibus DP via optional module).
• Measurement Inputs:​ Analog inputs for direct connection to PT100 RTDs​ (for bearing/winding temperature) and 4-20 mA​ transducers (e.g., for vibration or pressure).
• Housing:​ Compact, modular case for panel mounting.

4. System Integration

• Engineering Tool:​ Fully configured using ABB’s PCM600​ or MotorVision​ software for setting protection parameters, designing logic (CFC), and setting up communication.
• Integration:​ Acts as an intelligent motor protection and control center (MPCC), communicating directly with higher-level systems like DCS, SCADA, or PLCs over IEC 61850, Modbus, or Profibus.
• Wiring:​ Connects directly to Current Transformers (CTs), Voltage Transformers (VTs), circuit breaker trip coils, contactor coils, and field sensors.

5. Typical Applications

• Critical Process Motors:​ Pumps, fans, compressors, and conveyors in oil & gas, chemical, water/wastewater, and mining industries.
• High-Voltage Motors:​ Motors in the 3.3 kV, 6.6 kV, or 11 kV range.
• Boiler Feed Pumps, Induced Draft Fans​ in power plants.
• Large Compressor Trains​ in manufacturing and processing.