Troubleshooting procedure
The troubleshooting table is supposed to be used as a detailed instruction together
with the troubleshooting flowchart.
NoteAction
Make sure that the power unit is operational.Make sure the power has been off
for more than 10 seconds.
1
Wait at least 1 min after power-on.
Power on the controller. Check the
MODULE STATUS LED on the
power unit.
If the MODULE STATUS LED is:
• Off: The power unit is in the power off
state. Proceed with step 2.
• Red, steady: Internal error. Proceed with
step 7.
• Flashing red (~ 1Hz): Firmware error or
self-test failure. The power unit may be
faulty, see Replacing the power unit on
page 244.
• Flashing green (~ 1Hz): Internal commu-
nication error or 24V_SYS is missing.
Proceed with step 11.
• Steady green but DC-BUS High Voltage
LED is off: Proceed with step 12.
Verify that the input to A1.X1 is 380-480V AC.
• If AC_IN is between 380-480V AC, pro-
ceed with step 5.
• If AC_IN is is abnormal, there is an issue
with A1.X1. Proceed with step 3.
Verify AC_IN.2
If the connection seems OK, proceed with step
5.
Check the connector at A1.X1 (AC
input). Make sure that the power
cables are connected properly at
both ends.
3
If there is a problem with the connection, pro-
ceed with step 4.
If the connection seems OK, proceed with step
5.
Replace AC input cable A1.X1.4
If there is a problem with the connection, check
power source and incoming mains. Make sure
that AC_IN is OK.
Verify that the input to A1.X6 is 25.2 VDC +/-
5%.
• If the measured voltage is normal and
MODULE STATUS LED is green, pro-
ceed with step 7.
• If the measured voltage is normal and
MODULE STATUS LED is off, the unit
may be faulty, see Replacing the power
unit on page 244.
• If the measured voltage is abnormal,
proceed with step 6.
Measure the 24V_TRUNK at con-
nector A1.X6.
5
Continues on next page
Product manual - OmniCore V250XT Type B 387
3HAC087112-001 Revision: A
© Copyright 2023-2023 ABB. All rights reserved.
7 Troubleshooting
7.3.5 Troubleshooting the power unit
Continued
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