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22 C578M-A (4/05)
3.3 OPERATOR TOOLS
LEDs
A visual check of LED activity should be the top item on your checklist for determining the operational
status of the HS and the attached system. LED status tells you the following:
• Which mode (synchronous or asynchronous) the HS Is operating in
• Which side (A or B) is in control (synchronous mode)
• Which side (A or B) is in control (asynchronous mode)
• Which side is in control after an equipment failure
• Which side caused the system FAULT