ABB Robotics OmniCore C90XT, Product Manual, Page: 392 / 458

Note Action
Use a multimeter and insulating gloves. Measure the AC input voltage.
• A1.X1 - A1.K1
6
The AC input voltage should be 230 V.
Make sure that connector X1 is connected
properly on both ends.
• If the input voltage is normal, proceed
with step
12 .
• If the input voltage is abnormal, proceed
with the next step.
• If the connection is OK, troubleshoot No
LEDs are lit on the controller on page 364 .
• If there is a problem with the connection,
repair the connection and start over.
Check the connection from the
power inlet to the power unit. 7
• If the LEDs are normal, proceed with step
10 .
• If the LEDs are abnormal, proceed with
the next step.
Check the LEDs of the Ethernet
ports X3, X12 on the power unit. 8
• If the connection is OK, proceed with
step
12 .
• If there is a problem with the connection,
repair the connection and go to step
8 .
Check the connection of the Ether-
net cables. 9
Use a multimeter and insulating gloves. Measure the AC OK signal. 10
The AC OK should be 0 V.
Make sure that connector X13 is connected
properly on both ends.
• If the AC OK signal is 24 V, proceed with
step
12 .
• If the AC OK signal is 0 V, proceed with
the next step.
If message numbers 34401/34402, proceed with
step
12 .
Check event log if there is a mes-
sage about DC-link voltage. 11
If not, power unit is ok.
How to replace the unit is detailed in Replacing
the power unit on page 248 .
The power unit may be faulty, re-
place it and verify that the fault has
been fixed. 12
392 Product manual - OmniCore C90XT
3HAC073706-001 Revision: E
© Copyright 2020-2021 ABB. All rights reserved.
7 Troubleshooting
7.3.4 Troubleshooting the power unit
Continued