YASKAWA Sigma-V JUSP-MD D A Series, Руководство пользователя, Страница: 278 / 324

8.4 Troubleshooting Malfunction Based on Operation and Conditions of the Servomotor
8-29
8
Trou
blesh
ooting
Dynamic Brake
Does Not Operate
Improper Pn001.0 setting
Check the setting for parameter
Pn001.0. Correct the setting for parameter
Pn001.0.
DB resistor disconnected
Check if excessive moment of iner-
tia, motor overspeed, or DB fre-
quently activated occurred.
Turn OFF the servo system.
Replace the dynamic brake unit or
change the external dynamic brake
circuit. And reduce the load.
DB drive circuit fault −
Turn OFF the servo system. A
defective component is in the
dynamic brake circuit inside SER-
VOPACK. Replace the SERVO-
PACK.
Wiring of the dynamic brake unit is
incorrect.
Turn OFF the servo system.
Check the wiring.
Correct the wiring.
Abnormal Noise
from Servomotor
Mounting is not secured.
Turn OFF the servo system. Check
if there are any loose mounting
screws. Tighten the mounting screws.
Mounting is not secured.
Turn OFF the servo system. Check
if there is misalignment of cou-
plings.
Align the couplings.
Turn OFF the servo system. Check
if there are unbalanced couplings.
Balance the couplings.
Bearings are defective.
Turn OFF the servo system. Check
for noise and vibration around the
bearings.
Replace the servomotor.
Vibration source at the driven
machine.
Turn OFF the servo system. Check
for any foreign matter, damage, or
deformations on the machinery's
movable parts.
Contact the machine manufacturer.
Noise interference due to incorrect
I/O signal cable specifications.
Turn OFF the servo system. The I/O
signal cable must be tinned
annealed copper shielded twisted-
pair or screened unshielded twisted-
pair cable with a core of 0.12 mm
2
min.
Use the specified I/O signal cable.
Noise interference due to length of
I/O signal cable. Turn OFF the servo system. Check
the length of the I/O signal cable. The I/O signal cable length must be
no more than 3 m.
Noise interference due to incorrect
cable specifications of encoder
cable.
Turn OFF the servo system. The
encoder cable must be tinned
annealed copper shielded twisted-
pair or screened unshielded twisted-
pair cable with a core of 0.12 mm
2
min.
Use the specified encoder cable.
Noise interference due to length of
encoder cable. Turn OFF the servo system. Check
the length of the encoder cable. The encoder cable must be no more
than 50 m.
Noise interference due to damaged
encoder cable.
Turn OFF the servo system. Check
if the encoder cable is bent and the
sheath is damaged.
Replace the encoder cable and cor-
rect the cable layout.
Excessive noise to the encoder
cable.
Turn OFF the servo system. Check
if the encoder cable is bundled with
a high-current line or near a high-
current line.
• Correct the cable layout so that
no surge is applied.
• Use a double-shielded encoder
cable.
The FG potential varies because of
influence from machines on the ser-
vomotor side, such as the welder. Turn OFF the servo system. Check
if the machines are correctly
grounded.
Properly ground the machines to
separate from the encoder FG.
Multi-winding drive unit pulse
counting error occurred due to noise
interference Check if there is noise interference
on the I/O signal line from the
encoder. Turn OFF the servo system. Take
measures against noise in the
encoder wiring.
(cont’d)
Problem Probable Cause Investigative Actions Corrective Actions