3.2 Errors without alarm display and troubleshooting
3-6
Table 3.1 Errors without alarm display (cont
’
d)
Malfunction
Cause
Check point
Remedy
Spindle Motor and
Servomotor generates
unusual noise or
vibration.
The earth ground of
Motor or Drive Units is
wrong.
Check connection to
ground for motor and
Drive Unit.
Ground securely.
The encoder cable
affected by noise.
• Check separation of
encoder signal and
power line.
• Check grounding
shield of encoder
cable.
Arrange the encoder
cable suitably.
Check if twisted pair
cable with shield is used
for encoder wiring.
Replace cable.
Drive machine data have
wrong value.
Compare current value
of drive machine data
with setting list.
Correct drive machine
data.
The motor is not
mounted securely.
Check looseness of
mounting.
Retighten the fixing
screw.
There is something
abnormal on the bearing
or rotor.
Check the noise and
vibration around the
bearing during
independent operation of
the motor.
Replace the motor.
Coupling or centering
between machine and
motor is not precise.
Check misalignment and
imbalance of coupling.
Adjust the alignment or
balance of coupling.
Machine has source of
vibration or insufficient
strength.
Check the movable part
of machine for any
foreign matters, damage,
deformation and/or
source of vibration.
Contact maintenance
stuff or machine tool
builder.
Foundation bolts is
loosened.
Check the looseness of
foundation bolts.
Retighten the foundation
bolts.