Troubleshooting Malfunction Based On Operation And Conditions Of The Servomotor - YASKAWA SGDV series User Manual

9 Troubleshooting
9.3
Troubleshooting Malfunction Based on Operation and
Conditions of the Servomotor
Troubleshooting for the malfunctions based on the operation and conditions of the servomotor is provided in
this section.
Be sure to turn OFF the servo system before troubleshooting items shown in bold lines in the table.
Problem
Servomotor Does
Not Start
Servomotor
Moves
Instantaneously,
and then Stops
Servomotor
Speed Unstable
Servomotor
Rotates Without
Reference Input
9-28
Probable Cause
The control power supply is not
ON.
The main circuit power supply is
not ON.
Wiring of I/O signal connector CN1
is faulty or disconnected.
Wiring for servomotor main circuit
cable or encoder cable is discon-
nected.
Overloaded
Encoder type differs from parame-
ter setting (Pn002.2).
Settings for the input signal selec-
tions (Pn50A, Pn50B and Pn511) is
incorrect.
Sensor ON command is not turned
ON.
Servo ON command is not turned
ON.
The forward run prohibited (P-OT)
and reverse run prohibited (N-OT)
input signals are turned OFF.
The safety input signal (/HWBB1 or
/HWBB2) remains OFF.
The brake is not released.
A fault occurred in the SERVO-
PACK or converter.
Servomotor wiring is incorrect.
Encoder wiring is incorrect.
Wiring connection to servomotor is
defective.
A fault occurred in the SERVO-
PACK.
Investigative Actions
Check voltage between control
power terminals.
Check the voltage between main
circuit power terminals.
Check if the connector CN1 is prop-
erly inserted and connected.
Check the wiring.
Run under no load and check the
load status.
Check the settings for parameter
Pn002.2.
Check the settings for parameters
Pn50A, Pn50B and Pn511.
Check the command sent from the
host controller.
Check the command sent from the
host controller.
Check P-OT or N-OT input signal.
Check the /HWBB1 and /HWBB2
input signal.
Check the operation of the brake.
−
Check the wiring.
Check the wiring.
Check connections of power line
(phases U, V, and W) and encoder
connectors.
−
Corrective Actions
Correct the wiring so that the con-
trol power supply turns ON.
Correct the wiring so that the main
circuit power supply turns ON.
Correct the connector CN1 connec-
tion.
Correct the wiring.
Reduce load or replace with larger
capacity servomotor.
Set parameter Pn002.2 to the
encoder type being used.
Correct the settings for parameter
Pn50A, Pn50B and Pn511.
Turn ON the Servo ON command.
Send the command in the correct
SERVOPACK sequence.
Turn P-OT or N-OT input signal
ON.
Set the /HWBB1 and /HWBB2
input signal to ON.
When not using the safety function,
mount the safety function jumper
connector (provided as an acces-
sory) on the CN8.
Release the brake.
Replace the SERVOPACK or con-
verter.
Correct the wiring.
Correct the wiring.
Tighten any loose terminals or con-
nectors and correct the wiring.
Replace the SERVOPACK.