YASKAWA Sigma-V Series User Manual page 383

Problem Probable Cause
Servomotor Servomotor wiring is incorrect.
Moves
Instantaneously,
Encoder wiring is incorrect.
and then Stops
Servomotor Wiring connection to servomotor is
Speed Unstable defective.
Speed control: Speed reference
input is incorrect.
Torque control: Torque reference
input is incorrect.
Servomotor
Rotates Without
Reference Input
Speed reference offset is incorrect.
Position control: Reference pulse
input is incorrect.
A fault occurred in the SERVO-
PACK.
Improper Pn001.0 setting
DB resistor disconnected
Dynamic Brake
Does Not Operate
DB drive circuit fault
Wiring of the dynamic brake unit is
incorrect.
10.3 Troubleshooting Malfunction Based on Operation and Conditions of the Servomotor
Investigative Actions
Check the wiring.
Check the wiring.
Check connections of power line
(phases U, V, and W) and encoder
connectors.
Check V-REF and SG to confirm if
the control method and the input are
agreed.
Check V-REF and SG to confirm if
the control method and the input are
agreed.
The SERVOPACK offset is
adjusted incorrectly.
Check the reference pulse form
(Pn200.0) and sign + pulse signal.
−
Check the setting for parameter
Pn001.0.
Check if excessive moment of iner-
tia, motor overspeed, or DB fre-
quently activated occurred.
−
Check the wiring.
(cont'd)
Corrective Actions
Correct the wiring.
Correct the wiring.
Tighten any loose terminals or con-
nectors and correct the wiring.
Correct the control method selec-
tion parameter, and the input signal.
Correct the control method selec-
tion parameter, and the input signal.
Adjust the SERVOPACK offset.
Correct the control method selec-
tion parameter, and the input signal.
Replace the SERVOPACK.
Correct the setting for parameter
Pn001.0.
Replace the dynamic brake unit or
change the external dynamic brake
circuit. And reduce the load.
A defective component is in the
dynamic brake circuit inside SER-
VOPACK. Replace the SERVO-
PACK.
Correct the wiring.
10
10-27