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Operation
Table 13. LED activities and troubleshooting tips
LED Name
Marquee LED
Link and IMC
Service
30
Activities
Shows solid green when the unit is
powered and no alarm exists.
Shows blinking green during a device
reset or firmware download.
Shows solid red when the unit is
powered, but represents low power or
a malfunction.
Shows blinking red when an alarm or
fault exists.
LED not lit.
TX blinks green.
RX blinks yellow.
LED is not lit.
Shows solid green when the LED has
been pressed.
LED not lit.
Indication and Troubleshooting
Tips
Indicates normal operation
Indicates normal operation
•
If low power; could be under
voltage or the microprocessor
has malfunction. Follow the
troubleshoot procedure "24 Vac
Measurement," p. 46 to measure
for the expected value range. In
addition, see Table 4, p. 24, for a
list of 24 Vac draws.
•
If malfunction; un-power and
then re-power unit to bring the
unit back up to normal operation.
An alarm or fault condition will occur if
the value for a given point is invalid or
outside the configured limits for the
point. Alarm and fault conditions vary,
and they can be configured by the
programmer.
Indicates power is OFF or there is a
malfunction.
OFF or malfunction; cycle the power.
Blinks at the data transfer rate when
the unit transfers data to other
devices on the link.
Blinks at the data transfer rate when
the unit receives data from other
devices on the link.
ON solid yellow; indicates there is
reverse polarity.
Indicates that the controller is not
detecting communication.
Not lit; cycle the power to reestablish
communication.
Indicates controller is operating
normally.
Notes
When powering the Symbio 400–B/
500 and expansion module, the
Marquee LED will blink RED, blink
GREEN (indicating activated and
controller/expansion module are
communicating), and then stay
GREEN CONTINUOUSLY (indicating
normal power operation).
TX LED: Regardless of connectivity
or not, this LED will constantly blink
as it continually looks for devices to
communicate to.
LED not lit: Determine if, for example,
a Tracer Synchrony or BACnet device
is trying to talk to the controller or if it
is capable of talking to the controller.
Also determine if the communication
status shows down all of the time. In
addition, check polarity and baud
rate.
When the Symbio 400–B/500 is
placed into boot mode, the system
will not run any applications such as
trending, scheduling, and TGP2
runtime. The controller will be placed
into boot mode if the service pin is
held in when power is applied. In boot
mode, the controller is non-
operational and is waiting for a new
main application to be downloaded.
BAS-SVX091A-EN
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Table of Contents
Troubleshooting
