Troubleshooting Malfunction Based On Operation And Conditions - YASKAWA S-V Series User Manual

9 Troubleshooting
9.3
Troubleshooting Malfunction Based on Operation and
Conditions
Troubleshooting for the malfunctions based on operation and condition is provided in this section.
Be sure to turn OFF the servo system before troubleshooting items outlined in bold in the table.
(1) Rotational Servomotors
Problem
Servomotor Does
Not Start
Servomotor
Moves
Instantaneously,
and then Stops
Servomotor
Speed Unstable
Servomotor
Rotates without
Reference Input
Dynamic Brake
Does Not Operate
9-20
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.
Servomotor or encoder wiring is
disconnected.
The servomotor is overloaded.
Settings for input signals PnB03 to
PnB12 are incorrect.
A servo ON command was not
input.
The forward run prohibited (P-OT)
and reverse run prohibited (N-OT)
input signals are turned OFF.
The current position of the servo-
motor is outside the software limit
setting range.
There is no position reference, or it
is incorrect.
The safety input signal (/HWBB1 or
/HWBB2) remains OFF.
A SERVOPACK fault occurred.
Servomotor wiring is incorrect.
Encoder wiring is incorrect.
Wiring connection to servomotor is
defective.
A SERVOPACK fault occurred.
Setting for parameter Pn001.0 is
incorrect.
Dynamic brake resistor is
disconnected.
Investigative Actions
Check the voltage between control
power supply terminals.
Check the voltage between main
circuit power supply 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 settings of input signals
PnB03 to PnB12.
Check the command sent from the
host controller.
Check P-OT or N-OT input signal.
Check the error at the INDEXER
Module.
Check the error at the INDEXER
Module.
Check the /HWBB1 or /HWBB2
input signal.
–
Check the servomotor wiring.
Check the encoder wiring.
Check connections of main circuit
cable (phases-U, -V, and -W) and
encoder connectors.
–
Check the setting of parameter
Pn001.0.
Check if excessive moment of iner-
tia, motor overspeed, or Dynamic
Brake frequently activated.
If moment of inertia exceeds, motor
overspeeds, or Dynamic Brake is
frequently activated, Dynamic
Brake resistor may be disconnected.
Corrective Actions
Correct the wiring so that the con-
trol power supply comes ON.
Correct the wiring so that the con-
trol power supply comes ON.
Correct the connector CN1 connec-
tion.
Correct the wiring.
Reduce load or replace with larger
capacity servomotor.
Correct the settings of input signals
PnB03 to PnB12.
Send a servo ON command.
Turn P-OT or N-OT input signal
ON.
Check the motor position and soft-
ware limit setting (PnB21, PnB23),
then move the servomotor into the
software limit setting range.
Set the program table correctly.
Set the /HWBB1 or /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.
Replace the SERVOPACK.
Correct the wiring.
Correct the wiring.
Tighten any loose terminals or con-
nectors.
Replace the SERVOPACK.
Correct the parameter setting.
Replace the SERVOPACK, and
reduce the load to avoid disconnec-
tion.