ABB OmniCore IRB 6720, Product Manual

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7.3 Mechanical noise or dissonance
Description
Mechanical noise or dissonance that has not been observed before can indicate
problems in bearings, motors, gearboxes, or similar. Be observant of changes over
time.
A faulty bearing often emits scraping, grinding, or clicking noises shortly before
failing.
Consequences
Failing bearings cause the path accuracy to become inconsistent, and in severe
cases, the joint can seize completely.
Possible causes
The symptom can be caused by:
• Worn bearings.
• Contaminations have entered the bearing grooves.
• Loss of lubrication in bearings.
• Loose heat sinks, fans, or metal parts.
If the noise is emitted from a gearbox, the following can also apply:
• Overheating.
Recommended actions
The following actions are recommended:
Information Action
CAUTION
Allow hot parts to cool down.
1
Verify that the service is done according to
the maintenance schedule. 2
If a bearing is emitting the noise, determine
which one and make sure that it has suffi-
cient lubrication. 3
If possible, disassemble the joint and meas-
ure the clearance. 4
Bearings inside motors are not to be re-
placed individually, but the complete motor
is replaced. 5
Make sure the bearings are fitted correctly. 6
Tighten the screws if a heat sink, fan, or
metal sheet is loose. 7
612 Product manual - IRB 6720
3HAC085697-001 Revision: C
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7 Troubleshooting
7.3 Mechanical noise or dissonance