ABB OmniCore V250XT Type B Product Manual page 388

7 Troubleshooting
7.3.5 Troubleshooting the power unit
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Action
Disconnect A1.X6 24V_TRUNK
from the power unit and restart.
Check error message on FlexPend-
ant and take appropriate action.
Disconnect loads and test start.
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)
Replace cables:
• DC_OUT (X4 and X8)
• AC_OUT (X7 and X15)
• 24V_TRUNK (X6)
• 24V_BRAKE (X11 and X14)
Verify 24V_SYS.
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Note
Turn off power to the unit for 10 seconds and
restart. Check if the 24V_TRUNK voltage has
recovered.
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.
Turn off power for 10 seconds.
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.
If there is a problem with the connection, pro-
ceed with step 10.
If the connection and cables seem OK, proceed
with step 11.
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
.
Product manual - OmniCore V250XT Type B
3HAC087112-001 Revision: A