Troubleshooting SAGE 4400 RTU Using LED Indicators

Issue:

How to interpret LED indicators on the SAGE 4400 RTU for troubleshooting purposes.

Product:

SAGE 4400 RTU

Environment:

Substation automation systems using SAGE 4400 RTU for monitoring and control.

Cause:

Users may encounter operational issues and need a quick method to diagnose problems without advanced tools.

Resolution:

The SAGE 4400 front panel includes LEDs that provide real-time status for communication ports and system conditions:

• Comm LEDs (per RS232 port):
  • DCD/+5V: Data Carrier Detect or +5V output
  • RX: Receive activity
  • TX: Transmit activity
  • RTS: Request to Send
  • CTS: Clear to Send
• System LEDs:
  • Power: Indicates RTU power (normally ON)
  • Run: CPU running (blinking = normal; steady ON = Safe/Recovery mode; OFF = CPU not running)
  • Reset: Illuminates during reset signal (normally OFF)
  • Local: Indicates Local/Remote switch position (Local disables controls)
  • Time Source Failed: Configured time source failure
  • IED Failed: Communication failure with one or more IEDs
  • Alarm 1 & 2: Relay energized status
  • User Logged In: Active user session
  • Config Changed: New configuration XML file loaded but not yet activated
  • RLL Running: ISaGRAF logic program active
  • Ethernet Link: Valid Ethernet connection detected

Use these indicators to quickly identify power, communication, configuration, or control issues before performing deeper diagnostics.

Released for: Schneider Electric Saudi Arabia