ABB IRC5 Operating Manual page 205

Probable causes
The ambient temperature may be too high, the cooling fans
may have failed or the user program may consume more current
than the drive system can supply.
Recommended actions
Check that the fans are running and that the air flow is not
obstructed. Check that the ambient temperature does not
exceed the cabinet rating. If the system contains additional
axes then check that motors are not too large for the drive units.
If possible, rewrite the user program to reduce the amount of
hard acceleration.
39468, Drive Unit Temperature Alarm
Description
The temperature has risen above the alarm level in drive unit
number arg, drive module arg, which is the second abnormal
level of three.
Consequences
No operation will be possible until after correcting the fault. The
system goes to status SYS HALT.
Probable causes
The ambient temperature may be too high, the cooling fans
may have failed or the user program may consume more current
than the drive system can supply.
Recommended actions
Check that the fans are running and that the air flow is not
obstructed. Check that the ambient temperature does not
exceed the cabinet rating. If the system contains additional
axes then check that motors are not too large for the drive units.
If possible, rewrite the user program to reduce the amount of
hard acceleration.
39469, Drive Unit Temperature Critical
Description
The temperature has risen above the critical level in drive unit
number arg, drive module arg, which is the top abnormal level
of three.
Consequences
No operation will be possible until after correcting the fault. The
system goes to status SYS HALT.
Probable causes
The ambient temperature may be too high, the cooling fans
may have failed or the user program may consume more current
than the drive system can supply.
Operating manual - Troubleshooting IRC5
3HAC020738-001 Revision: AA
Recommended actions
Check that the fans are running and that the air flow is not
obstructed. Check that the ambient temperature does not
exceed the cabinet rating. If the system contains additional
axes then check that motors are not too large for the drive units.
If possible, rewrite the user program to reduce the amount of
hard acceleration.
39470, Power Semiconductor Warning
Description
The power semiconductor is approaching overload for joint arg,
in drive unit number arg, drive module arg .
Consequences
Probable causes
The motor load may be too high, the motor may have stalled
(maybe due to a collision), the motor load may be too high or
there may not be enough cooling.
Recommended actions
Check that the robot has not collided. Check that the fans are
running and that the air flow is not obstructed. Check that the
ambient temperature does not exceed the cabinet rating. If the
system contains additional axes then check that motors are not
too large for the drive units. If possible, rewrite the user program
to reduce the amount of hard acceleration.
39471, Power Semiconductor Overload Error
Description
The power semiconductor has been overloaded for joint arg,
in drive unit number arg, drive module arg .
Consequences
No operation will be possible until after correcting the fault. The
system goes to status SYS HALT.
Probable causes
The motor load may be too high, the motor may have stalled
(maybe due to a collision), the motor load may be too high or
there may not be enough cooling.
Recommended actions
Check that the robot has not collided. Check that the fans are
running and that the air flow is not obstructed. Check that the
ambient temperature does not exceed the cabinet rating. If the
system contains additional axes then check that motors are not
too large for the drive units. If possible, rewrite the user program
to reduce the amount of hard acceleration.
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5 Troubleshooting by event log
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