Chapter 7: Service and troubleshooting
224 EST3X Technical Reference Manual
Analog device troubleshooting
Module LED indicators
Each analog addressable module has an integral red status LED. The LED is
useful when trying to determine the communication and alarm or active status of
a device. See Table 70.
Table 70: Analog addressable device status LED
status Device status
Polling device
Alarm or active
Common causes of analog addressable module
problems
Common causes for analog addressable modules not responding correctly or
reporting trouble events are listed below.
• A module/device is installed in the wrong location or is not addressed
correctly
• A module/device is not defined in the 3-SDU database
• A module/device is missing or incorrectly connected to the loop
• The break-off tab is set incorrectly
• A ground fault is detected
• There is incorrect wiring
• A short or open is detected on the output loop
• The polarized device is installed in reverse
• There is an incorrect or missing EOL resistor
• The EOL resistor value is too low
• The module is defective
Refer to “Using the SDU Analog Addressable diagnostic tool” on page 226 for
details on how to identify and locate Analog Addressable device and module
problems.
To Next Page
Loading...
