YASKAWA SGDV SERVOPACK, User Manual

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9 Troubleshooting
9-26
Servomotor Does
Not Start (cont’d) The polarity detection is not exe-
cuted.
Check the parameter Pn080.0. Correct the setting of Pn080.0.
Check the /S-ON or /P-DET input
signal.
• When using an incremental linear
scale, turn ON the /S-ON or /P-
DET input signal.
• When using an absolute linear
scale, turn OFF the external /S-
ON input signal and execute
Fn080.
Servomotor
Moves Instanta-
neously, and then
Stops
Servomotor wiring is incorrect. Check the wiring. Correct the wiring.
Serial converter unit wiring is incor-
rect.
Check the wiring. Correct the wiring.
Linear scale wiring is incorrect. Check the wiring. Correct the wiring.
Linear scale pitch (Pn282) is incor-
rect.
Check the setting of Pn282. Correct the setting of Pn282.
Linear scale counting up direction
and servomotor coil assembly for-
ward direction do not agree.
Check the directions.
Change the setting of Pn080.1
(Motor Phase Selection).
Match the linear scale direction and
coil assembly direction.
Polarity detection is not performed
correctly.
Check if the value of Un004 (elec-
trical angle 2 from polarity origin)
at an arbitrary position is between

10 degrees.
Correct the settings for the polarity
detection related parameter.
Servomotor
Speed Unstable
Wiring connection to servomotor is
defective.
Check connections of power line
(phases U, V, and W) and serial
converter unit connectors.
Tighten any loose terminals or con-
nectors and correct the wiring.
Servomotor
Moves Without
Reference Input
Speed control: Speed reference
input is incorrect.
Check V-REF and SG to confirm if
the control method and the input are
agreed.
Correct the control method selec-
tion parameter, and the input signal.
Force control: Force reference input
is incorrect.
Check V-REF and SG to confirm if
the control method and the input are
agreed.
Correct the control method selec-
tion parameter, and the input signal.
Speed reference offset is incorrect.
The SERVOPACK offset is
adjusted incorrectly.
Adjust the SERVOPACK offset.
Position control: Reference pulse
input is incorrect. Check the reference pulse form
(Pn200.0) and sign + pulse signal. Correct the control method selec-
tion parameter, and the input signal.
A SERVOPACK fault occurred.

Replace the SERVOPACK.
Linear scale counting up direction
and servomotor coil assembly for-
ward direction do not agree.
Check the directions.
Change the setting of Pn080.1
(Motor Phase Selection).
Match the linear scale direction and
servomotor direction.
Polarity detection is not performed
correctly.
Check if the value of Un004 (elec-
trical angle 2 from polarity origin)
at an arbitrary position is between

10 degrees.
Correct the settings for the polarity
detection related parameter.
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 mass, motor
overspeed, or DB frequently acti-
vated occurred.
Replace the SERVOPACK, and
reduce the load.
DB drive circuit fault

There is a defective component in
the DB circuit. Replace the SER-
VOPACK.
(cont’d)
Problem Probable Cause Investigative Actions Corrective Actions