GE Industrial Solutions Entellisys System User Manual - Manual (Page 16)

System architecture 16
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1.3.4 EntelliGuard Messenger
The EntelliGuard Messenger electronic device provides the interface between the circuit
breakers and the CPUs in the Entellisys system.
Following is a summary of the Messenger’s functionality:
• Digitizes all switchgear signals
• Communicates the raw samples to CPUs via the Messenger network
• Controls the circuit breaker
• Performs independent backup trip capability at all times
• Powered by dual 120v control power sources or self-powered from the current sensors
• Provides LED illumination of circuit breaker status, power status, communication status, and
GE “Locator” information
• Provides seal-able switches to set CT rating, and (long time) multiplier setting
• Provides a test connector for trip curve testing using the Entellisys System Test Kit
1.3.4.1 Messenger User Interface
The Messenger User Interface, as show in Figure 1-6, is described below.
Figure 1-6 Messenger front
LED Indicator Lights
• Locate: LED blinks for 10 or 30 seconds on command from the HMI to help operator
physically locate a circuit breaker in the switchgear lineup.
• Com1, Com2: Illuminates when Ethernet communication is plugged in and ready to
communicate.
• Power: Illuminates when either Control Power A or Control Power B sources are powering the
node.
• Circuit Breaker Status Open: Illuminates when the circuit breaker is Open. This sensor is
independent of the circuit breaker Close sensor.
• Circuit Breaker Status Closed: Illuminates when the circuit breaker is Closed. This sensor is
independent of the circuit breaker Open sensor.
Switches
• Rating: Ampere rating of the circuit in use. Maximum value is the CT Rating.
• Setting: Multiplier setting for Long Time Overcurrent Protection, specified as X times the
Rating switch value.
Rating Label
• Frame: Circuit breaker frame size, in Amperes, represents the maximum continuous-current
rating.
• CT: Maximum Ampere rating of the CTs.