Mechanical Operation and Maintenance Manual for ER20-1700 Industrial Robot
39
Chapter Five Common Faults and Troubleshooting
When robot body malfunctions, read this chapter to diagnose initial faults. The table below covers
common faults that may happen to robot body, possible reason analysis, and corresponding troubleshooting
techniques, which can help users to troubleshoot them. If faults remain, please contact our service
department.
Fault
Type
Possible reasons
Troubleshooting
vibratio
n and
abnorm
al noise
The base and the
mounting foundation
are not firmly fixed.
（
1
）
The base and the
mounting base are not flat
enough or objects are
clamped in between, so they
cannot fit firmly;
（
2
）
Screws are not tightened
in connecting the base and
the mounting base, or the
screws are loosened after
long-term operation.
（
1
）
Check and trim the flatness of
the base and the mounting base, so
the tolerance meets the installation
requirements;
（
2
）
If objects appear between the
base and the mounting base, clear
them before reinstallation;
（
3
）
Use a torque wrench to tighten
the screws with required torque.
The base and the
mounting foundation
are not firmly fixed.
（
1
）
The ground conditions
for installation do not meet
requirements, and the
foundation rigidity is
insufficient;
（
2
）
The specifications and
strength of chemical bolts do
not meet the requirements.
Refer to 3.2.3 Ground Mounting in
this manual, so the concrete
foundation and chemical bolt set
meet installation requirements.
The robot vibrates
obviously in a certain
posture or state
（
1
）
Overload exceeding the
limit leads to insufficient
stiffness in certain postures
and vibration;
（
2
）
Improper programming
and parameter setting cause
vibration.
（
1
）
Decrease load and ensure it is
within the allowable range;
（
2
）
Edit the program and adjust
parameters. Test from low-speed to
high-speed mode until the robot
returns to normal operation state.
The robot vibrates
and makes abnormal
noise in the
following three
situations:
（
1
）
after a collision;
（
2
）
long-term
overload operation
（
3
）
Long-term
The three situations can all
cause the damage of internal
components (gears, bearings,
and reducers), leading to
vibration and abnormal
noise.
（
1
）
Check each axis of the
single-action robot and confirm the
damaged joints, and then consult
after-sales service department for
replacement;
（
2
）
Try to avoid collision and
long-term overload operation.
Change lubricant according the
maintenance requirements in this
