Diagnostics and Troubleshooting
UNT-SVX041D-EN
79
Tracer® UC400-B Controller
LED Activity
LEDs are located on the front of the Tracer
®
UC400-B
controller. The following table provides a description of
LED activity, an indication or troubleshooting tip for each,
and any related notes.
Table 41. LED activity and troubleshooting tips for Tracer® UC400-B controller
LED Name
Activities
Indication and Troubleshooting Tips
Notes
Marquee LED
Shows solid green
when the unit is
powered
and no
alarm exists
Indicates normal operation
When powering the UC400-B and expansion module,
the Marquee LED will blink
RED
, blink
GREEN
(indicating activated and controller/expansion module
are communicating), and then stay
GREEN
CONTINUOSLY
(indicating normal power operation).
Shows blinking
green during a
device reset or
firmware
download
Indicates normal operation
Shows solid red
when the unit is
powered
, but
represents low
power or a
malfunction
If low power
; could be under voltage or the
microprocessor has malfunction. Measure for the
expected value range. For more information, refer to
Installation, Operation, and Maintenance: Tracer®
UC400-B Programmable Controller
(BAS-SVX20C-EN,
or the most recent version).
If malfunction
; un-power and then re-power unit to
bring the unit back up to normal operation.
Shows blinking
red when an
alarm
or fault
exists
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.
LED not lit
Indicates power is OFF or there is a malfunction
OFF
or
malfunction
; cycle the power. For more
information, refer to
Installation, Operation, and
Maintenance: Tracer® UC400-B Programmable
Controller
(BAS-SVX20*-EN, or the most recent
version).
Link and IMC
TX blinks green
Blinks at the data transfer rate when the unit transfers
data to other devices on the link
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® SC 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.
For more information, refer to
Installation, Operation,
and Maintenance: Tracer® UC400-B Programmable
Controller
(BAS-SVX20*-EN, or the most recent
version).
RX blinks yellow
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
LED is not lit
Indicates that the controller is not detecting
communication
Not lit
; cycle the power to reestablish communication
Service
Shows solid green
when the LED has
been pressed
When the UC400-B 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.
LED not lit
Indicates controller is operating normally
Binary B01
through B09
Shows solid
yellow
Indicates a corresponding binary output has been
commanded
ON
Relay coil
; indicates that a command has been made
to energize
TRIAC
; indicates that a command has been made to
turn ON
If the user is currently powering the UC400-B from a
USB port, the Led lights will turn
ON
. However, the
binary outputs
will
not
be activated.
Commanded ON
; As an example of commanded ON,
a command could be a manual command such as an
override or a command could be from TGP2 based on
a list of conditions that are met telling these outputs
to turn ON.
LED not lit:
Did the user command it to be ON? If yes, see the
Marquee LED at the top of this table. For more
information, refer to
Installation, Operation, and
Maintenance: Tracer® UC400-B Programmable
Controller
(BAS-SVX20*-EN, or the most recent
version).
LED not lit
Indicates that a relay output is de-energized or no
power to the board
Not lit
; cycle power to reestablish communication
