YASKAWA SGDV-OCA05A

14.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
14-58
Dynamic
Brake Does
Not Operate
The setting of Pn001 =
n.X (Servo OFF or
Alarm Group 1 Stopping
Method) is not suitable.
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.
Turn OFF the power
supply to the servo
system.
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.
Turn OFF the power
supply to the servo
system.
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.
If the situation is not
improved, disable the
tuning-less function
(i.e., set Pn170 to
n.0) and execute
autotuning either with
or without a host refer-
ence.
page 8-11
The machine mounting is not
secure.
Turn OFF the power sup-
ply to the servo system.
Check to see if there are
any loose mounting
screws.
Tighten the mounting
screws.
−
Turn OFF the power sup-
ply to the servo system.
Check to see if there is
misalignment in the cou-
pling.
Align the coupling.
−
Turn OFF the power sup-
ply to the servo system.
Check to see if the cou-
pling is balanced.
Balance the coupling.
−
The bearings are defective.
Turn OFF the power sup-
ply to the servo system.
Check for noise and
vibration around the bear-
ings.
Replace the Servomo-
tor.
−
There is a vibration source at
the driven machine.
Turn OFF the power sup-
ply to the servo system.
Check for any foreign
matter, damage, or defor-
mation in the machine’s
moving parts.
Consult with the
machine manufacturer.
−
Continued on next page.
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference