Carrier RTU Open v3 - Troubleshooting; Communication LEDs

Troubleshooting
RTU Open v3 CARRIER CORPORATION ©2019
Installation and Start-up Guide All rights reserved
59
If you have problems mounting, wiring, or addressing the RTU Open, contact Carrier Control Systems Support.
NOTE
To help you troubleshoot, obtain a Module Status (Modstat) from the controller and review the System Error
and Warning details.
Communication LED's
The LED's on the RTU Open show the status of certain functions. Verify the LED patterns by cycling power to the
controller and noting the lights and flashes.
If this LED is on...
Status is...
Power
The RTU Open has power.
Rx
The RTU Open is receiving data from the network segment
Tx
The RTU Open is transmitting data over the network segment
DO#
The binary output is active
The
Run
and
Error
LED's indicate controller and network status.
If Run LED shows...
And Error LED shows...
Status is..
2 flashes per second Off Normal
2 flashes per second 2 flashes,
alternating with
Run
LED
Five minute auto-restart delay after system error
2 flashes per second 3 flashes, then off The controller has just been formatted
2 flashes per second On Exec halted after frequent system errors or
control programs halted
5 flashes per second Off Firmware transfer in progress, Boot is running
7 flashes per second 7 flashes per second,
alternating with
Run
LED
Ten second recovery period after brownout
14 flashes per second 14 flashes per second,
alternating with
Run
LED
Brownout
On On Failure. Try the following solutions:
• Turn the RTU Open off, then on.
• Format the RTU Open.
• Download memory to the RTU Open.
• Replace the RTU Open.
Troubleshooting