Overview

The MMCU-500C (Multi Monitoring Communication Unit) is a data communication and monitoring system that integrates multiple sensors, including level, temperature, and pressure transmitters. It processes and transmits data via RS-485 MODBUS protocol for marine and industrial applications.

1. Safety Information (p.5-6)

• Electrical Hazards:
  • Power must be isolated before installation or maintenance.
  • High voltage is present; ensure proper precautions.
• Electrostatic Discharge (ESD) Precautions:
  • Avoid static electricity discharges.
  • Store and handle electronic components properly.

2. Storage Before Installation (p.7)

• Store in a dry, sheltered area to prevent damage.
• Inspect all components for physical damage before installation.

3. System Description & Layout (p.9-11)

• Components:
  • TLP-80MUX: Handles level, temperature, and pressure signals.
  • AD-320: Converts 4-20mA signals into digital values.
  • HTS-1308S & HTS-1308R: Convert HART signals to MODBUS RS-485.
  • MMCU500CDI: TFT LCD display and communication interface.
  • MMCU500CSP: Power supply module.
• Communication Protocol:
  • Uses RS-485 MODBUS RTU for data exchange.
  • Compatible with monitoring PCs and external control systems.

4. Installation & Commissioning (p.12-21)

• Installation:
  • Mount in a dry, vibration-free location.
  • Keep cables separate from high-voltage power lines.
• Electrical Connection:
  • Power Supply: 24V DC input/output.
  • Serial Ports:
    • COM 1 & 2: Connect to level gauge systems.
    • COM 3 & 4: Connect to monitoring computers.
• Commissioning Process:
  • Verify power supply and communication LEDs.
  • Perform sensor status checks.
  • Backup configuration data before operation.

5. System Operation & User Interface (p.28-36)

• Home Screen: Displays real-time sensor data and alarms.
• Tank Monitoring:
  • Supports Cargo, Ballast, and Fuel Tanks.
  • Displays ullage, level, temperature, and pressure.
  • Alarm indicators for High, Low, and Sensor Fail conditions.
• Event & Alarm History:
  • Logs system faults, alarms, and configuration changes.
• Settings Menu:
  • Tank Information: Configure alarm thresholds and offsets.
  • Communication Settings: Adjust serial port configurations.
  • Password Protection: Restrict access to critical settings.

6. Troubleshooting Guide (p.44-58)

• Incorrect Sensor Readings:
  • Compare raw sensor values with expected data.
  • Save communication logs for troubleshooting.
• Communication Port Failure:
  • Check RS-485/422 DIP switch settings.
  • Ensure unique COM port numbers are assigned.
• Tank Height Calibration Issues:
  • Adjust Min/Max height settings in Tank Information Menu.
• Language & Time Settings:
  • Switch between English and Korean via Regional Settings.
  • Adjust local time settings under Control Panel.
• Software Reinstallation:
  • Copy MMCU-500C program files from USB drive to Flash Disk.
  • Restart the MMCU-500C unit.

7. Technical Specifications (p.27)

• Input Ports:
  • 128 x 4-20mA input channels.
  • 32 x HART communication channels.
  • 32 x RS-485 communication channels.
  • 24 x TLP-100S transmitters.
• Relay Outputs:
  • System Fault, Data Alarm, Power Supply Fault, Sensor Error.
• Power Supply: 24V DC, 150VA consumption.
• Operating Temperature: 5°C to 70°C.
• Dimensions: 3U 19” Rack-mountable.
• Weight: 4.5 kg.