Yaskawa Sigma-5 Large Capacity Users Manual: Design and Maintenance-Rotary Motors-Analog Voltage and Pulse Train Reference User Manual
Page 383
10.3 Troubleshooting Malfunction Based on Operation and Conditions of the Servomotor
10-27
10
Trou
blesh
ooting
Servomotor
Moves
Instantaneously,
and then Stops
Servomotor wiring is incorrect.
Check the wiring.
Correct the wiring.
Encoder wiring is incorrect.
Check the wiring.
Correct the wiring.
Servomotor
Speed Unstable
Wiring connection to servomotor is
defective.
Check connections of power line
(phases U, V, and W) and encoder
connectors.
Tighten any loose terminals or con-
nectors and correct the wiring.
Servomotor
Rotates 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.
Torque control: Torque 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 fault occurred in the SERVO-
PACK.
−
Replace the SERVOPACK.
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.
Replace the dynamic brake unit or
change the external dynamic brake
circuit. And reduce the load.
DB drive circuit fault
−
A defective component is in the
dynamic brake circuit inside SER-
VOPACK. Replace the SERVO-
PACK.
Wiring of the dynamic brake unit is
incorrect.
Check the wiring.
Correct the wiring.
(cont’d)
Problem
Probable Cause
Investigative Actions
Corrective Actions