Omron R88M-W60010T User Manual page 370

Troubleshooting
Symptom
DB (dynamic The parameter setting is
brake) does not incorrect.
operate.
DB resistance is discon-
nected.
DB drive circuit is defec-
tive.
The Servomotor is The mechanical installation
making strange is faulty.
noises.
There is a problem with the
bearings.
The source of vibration is
in another machine.
Noise is carried because
the input signal line specifi-
cations are incorrect.
Noise is carried because
the encoder cable specifi-
cations are incorrect.
The encoder cable is car-
rying noise because the
distance exceeds the oper-
ating range.
Noise interference is
occurring because of dam-
age to the encoder cable.
There is excessive noise
interference to the encoder
cable.
The electric potential of the
FG is fluctuating due to
influence from machinery
(such as welders) in the
vicinity of the Servomotor.
The Servo Driver pulse
count is incorrect due to
noise.
5-38
Probable cause
• Check the setting for
• Is there excessive inertia,
• A DB circuit component is
• Are Servomotor mounting
• Are couplings off center?
• Are couplings unbalanced? • Balance the couplings.
• Check for sounds and
• Have any foreign objects
• Is twisted-pair wire or
• Is twisted-pair wire or
• Use a maximum wiring dis-
• The encoder cable is
• Is the encoder cable bun-
• What is the grounding sta-
• Is noise being carried to the
Items to check
Pn001.0.
rotation speed, or fre-
quency of DB use?
defective.
screws loose?
vibration around the bear-
ings.
gotten into the movable
parts of the machine, or is
there any damage or defor-
mation?
twisted-pair bound shielded
2
core wire of 0.12 mm min.,
made of tin-coated soft
copper, being used?
twisted-pair bound shielded
2
core wire of 0.12 mm min.,
made of tin-coated soft
copper, being used?
tance of 20 m.
crimped, or deterioration of
the insulation is allowing
noise to affect the signal
line.
dled with, or close to, lines
carrying a large current?
tus of equipment such as
welding machines near the
Servomotor (e.g., imper-
fectly grounded, not
grounded at all)?
line for signals coming from
the encoder?
Chapter 5
Countermeasures
• Correct the parameter set-
ting.
• Replace the Servo Driver
and check the load system.
• Replace the Servo Driver.
• Tighten the mounting
screws.
• Center the couplings.
• If there are any abnormali-
ties, please contact an
OMRON representative.
• Consult with the maker of
the machine.
• Make sure that input signal
lines conform to the specifi-
cations.
• Make sure that the encoder
cable conforms to the spec-
ifications.
• Make sure that the encoder
cable distance conforms to
the specifications.
• Correct the cable installa-
tion.
• Arrange the cable so that
the encoder cable is not
affected by surges.
• Ground the machinery to
prevent branching to the
encoder's FG.
• Implement measures
against noise in the
encoder wiring.