Description
The status indicator LED can be used to identify the following status
during startup/power on:
1 Red, steady: Default when power is available.
2 Red, flashing: Power is on, self-test is ongoing, operating system
is loading.
3 Green, flashing: Application is loaded and waiting for commu-
nication.
4 Green, steady: Power unit is operational.
If the LED does not turn steady green after 30-60sec, then the status
indicator LED can be used to identify the following issues:
• No color: Power to the power unit is missing.
• Red, steady: Internal error.
• Red, flashing: Firmware error or self-test failure.
• Green, flashing: Communication error to another module.
Power unit status
LED
Required test equipment
Equipment needed for troubleshooting:
NoteEquipment
Multimeter
Insulating gloves
3HAC065464-009Circuit diagram - OmniCore C90XT
Preparations
Action
Check the FlexPendant for errors and warnings.1
Power the controller off. Wait one minute, power the controller on.2
Make sure that the control system power supply is in run-time mode.3
Wait 30-60 seconds after power-on.
Continues on next page
Product manual - OmniCore C90XT 383
3HAC073706-001 Revision: D
© Copyright 2020-2021 ABB. All rights reserved.
7 Troubleshooting
7.3.4 Troubleshooting the power unit
Continued
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