5.1 FT40 Specification
5.1.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
5-51
5
Maintenance
Dynamic
Brake Does
Not Operate
The setting of Pn001 =
n.
X (Motor Stopping
Method for Servo OFF and
Group 1 Alarms) is not suit-
able.
Check the setting of
Pn001 = n.
X.
Set Pn001 = n.
X
correctly.
–
The dynamic brake resistor is
disconnected.
Check the moment of
inertia, motor speed, and
dynamic brake frequency
of use. If the moment of
inertia, motor speed, or
dynamic brake frequency
of use is excessive, the
dynamic brake resis-
tance may be discon-
nected.
Replace the SERVO-
PACK. To prevent dis-
connection, reduce the
load.
–
There was a failure in the
dynamic brake drive circuit.
–
There is a defective
component in the
dynamic brake circuit.
Replace the SERVO-
PACK.
–
Abnormal
Noise from
Servomotor
The Servomotor vibrated
considerably while perform-
ing the tuning-less function
with the default settings.
Check the waveform of
the motor speed.
Reduce the load so
that the moment of
inertia ratio or mass
ratio is within the allow-
able value, or increase
the load level or reduce
the rigidity level in the
tuning-less level set-
tings.
*
The machine mounting is not
secure.
Check to see if there are
any loose mounting
screws.
Tighten the mounting
screws.
–
The machine mounting is not
secure.
Check to see if there is
misalignment in the cou-
pling.
Align the coupling.
–
Check to see if the cou-
pling is balanced.
Balance the coupling.
–
The bearings are defective.
Check for noise and
vibration around the bear-
ings.
Replace the Servomo-
tor.
–
There is a vibration source at
the driven machine.
Check for any foreign
matter, damage, or defor-
mation in the machine’s
moving parts.
Consult with the
machine manufacturer.
–
Noise interference occurred
because of incorrect I/O sig-
nal cable specifications.
Check the I/O signal
cables to see if they sat-
isfy specifications. Use
shielded twisted-pair wire
cables or screened
twisted-pair cables with
conductors of at least
0.12 mm
2
.
Use cables that satisfy
the specifications.
–
Noise interference occurred
because an I/O signal cable
is too long.
Check the lengths of the
I/O signal cables.
The I/O signal cables
must be no longer than
3 m.
–
Noise interference occurred
because of incorrect Encoder
Cable specifications.
Make sure that the rotary
or Linear Encoder Cable
satisfies the specifica-
tions. Use a shielded
twisted-pair wire cable or
a screened twisted-pair
cable with a conductors
of at least 0.12 mm
2
.
Use cables that satisfy
the specifications.
–
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference
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