YASKAWA E-7S SERVOPACK SGD7S Product Manual page 581

15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Servomotor
Does Not
Start
Servomotor
Moves
Instanta-
neously,
and Then
Stops
Servomotor
Speed Is
Unstable
15-70
Possible Cause
The safety input signals
(/HWBB1 or /HWBB2) were
not turned ON.
A failure occurred in the SER-
VOPACK.
The polarity detection was
not executed.
There is a mistake in the Ser-
vomotor wiring.
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
There is a mistake in the lin-
ear encoder wiring.
The setting of Pn282 (Linear
Encoder Pitch) is not correct.
The count-up direction of the
linear encoder does not
match the forward direction
of the Moving Coil in the
motor.
Polarity detection was not
performed correctly.
There is a faulty connection
in the Servomotor wiring.
Confirmation
Check the /HWBB1 and
/HWBB2 input signals.
–
Check the setting of
Pn080 =n.X (Polar-
ity Sensor Selection).
Check the /S-ON (Servo
ON) signal.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Check the setting of
Pn282.
Check the directions.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
The connector connec-
tions for the power line
(U, V, and W phases) and
the encoder or Serial
Converter Unit may be
unstable.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Continued from previous page.
Correction Reference
Turn ON the /HWBB1
and /HWBB2 input sig-
nals. If you are not
using the safety func-
page 9-6
tion, connect the Safety
Jumper Connector
(provided as an acces-
sory) to CN8.
Turn OFF the power
supply to the servo
system. –
Replace the SERVO-
PACK.
Correct the parameter
page 5-23
setting.
• If you are using an
incremental linear
encoder, input the /S-
ON signal from the
host controller.
page 5-24
• If you are using an
absolute linear
encoder, execute
polarity detection.
Wire the Servomotor
–
correctly.
Wire the Serial Con-
–
verter Unit correctly.
Wire the cable cor-
–
rectly.
Correct the setting of
page 5-16
Pn282.
Change the setting of
Pn080 = n.X
(Motor Phase Selec-
page 5-21
tion). Place the linear
encoder and motor in
the same direction.
Correct the settings for
the polarity detection- –
related parameters.
Tighten any loose ter-
minals or connectors –
and correct the wiring.
Continued on next page.