NoteAction
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 358.
• 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 242.
The power unit may be faulty, re-
place it and verify that the fault has
been fixed.
12
386 Product manual - OmniCore C90XT
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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