NoteAction
Turn off power to the unit for 10 seconds and
restart. Check if the 24V_TRUNK voltage has
recovered.
Disconnect A1.X6 24V_TRUNK
from the power unit and restart.
6
Verify that the input to A1.X6 is 25.2 VDC -5%,
+5%.
• If the measured voltage is normal with
A1.X6 disconnected, the load attached
to the power unit is causing the unit to
trip, see .
• If the measured voltage is abnormal with
A1.X6 disconnected, the unit may be
faulty, see Replacing the power unit on
page 244.
• If the error message is insufficient, pro-
ceed with step 8.
• If an error was resolved, restart from step
1.
Check error message on FlexPend-
ant and take appropriate action.
7
Turn off power for 10 seconds.Disconnect loads and test start.8
Disconnect the following loads:
• DC_OUT (X4 and X8, Drive unit)
• AC_OUT (X7 and X15, External AC Sup-
ply to customer power supply)
• 24V_TRUNK (X6, Robot signal exchange
proxy)
• 24V_BRAKE (X11 and X14, Drive unit)
Turn on power again.
• If the MODULE STATUS LED is green
with the loads disconnected, Proceed
with step 9.
• If the fault remains, the unit may be
faulty, see Replacing the power unit on
page 244.
If the connection and cables seem OK, proceed
with step 11.
Make sure that the cables are con-
nected properly at both ends:
• DC_OUT (X4 and X8)
• AC_OUT (X7 and X15)
• 24V_TRUNK (X6)
• 24V_BRAKE (X11 and X14)
9
If there is a problem with the connection, pro-
ceed with step 10.
If the connection and cables seem OK, proceed
with step 11.
Replace cables:
• DC_OUT (X4 and X8)
• AC_OUT (X7 and X15)
• 24V_TRUNK (X6)
• 24V_BRAKE (X11 and X14)
10
If there is a problem with the connection, the
connected loads are out of specification. Con-
tact your local ABB.
Verify that 24V SYS DRV IN (X9) is stable at 24
VDC (18VDC – 26.4VDC).
• If the measured voltage is normal and
MODULE STATUS LED is flashing green,
the unit has internal communication er-
ror, see Replacing the power unit on
page 244.
• If the measured voltage is abnormal, see
.
Verify 24V_SYS.11
Continues on next page
388 Product manual - OmniCore V250XT Type B
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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