User`s manual

9.3 Troubleshooting Malfunction Based on Operation and Conditions
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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 Probable Cause Investigative Actions Corrective Actions
Servomotor Does
Not Start
The control power supply is not
ON.
Check the voltage between control
power supply terminals.
Correct the wiring so that the con-
trol power supply comes ON.
The main circuit power supply is
not ON.
Check the voltage between main
circuit power supply terminals.
Correct the wiring so that the con-
trol power supply comes ON.
Wiring of I/O signal connector CN1
is faulty or disconnected.
Check if the connector CN1 is prop-
erly inserted and connected.
Correct the connector CN1 connec-
tion.
Servomotor or encoder wiring is
disconnected.
Check the wiring. Correct the wiring.
The servomotor is overloaded.
Run under no load and check the
load status.
Reduce load or replace with larger
capacity servomotor.
Settings for input signals PnB03 to
PnB12 are incorrect.
Check settings of input signals
PnB03 to PnB12.
Correct the settings of input signals
PnB03 to PnB12.
A servo ON command was not
input.
Check the command sent from the
host controller.
Send a servo ON command.
The forward run prohibited (P-OT)
and reverse run prohibited (N-OT)
input signals are turned OFF.
Check P-OT or N-OT input signal.
Turn P-OT or N-OT input signal
ON.
The current position of the servo-
motor is outside the software limit
setting range.
Check the error at the INDEXER
Module.
Check the motor position and soft-
ware limit setting (PnB21, PnB23),
then move the servomotor into the
software limit setting range.
There is no position reference, or it
is incorrect.
Check the error at the INDEXER
Module.
Set the program table correctly.
The safety input signal (/HWBB1 or
/HWBB2) remains OFF.
Check the /HWBB1 or /HWBB2
input signal.
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.
A SERVOPACK fault occurred. – Replace the SERVOPACK.
Servomotor
Moves
Instantaneously,
and then Stops
Servomotor wiring is incorrect. Check the servomotor wiring. Correct the wiring.
Encoder wiring is incorrect. Check the encoder wiring. Correct the wiring.
Servomotor
Speed Unstable
Wiring connection to servomotor is
defective.
Check connections of main circuit
cable (phases-U, -V, and -W) and
encoder connectors.
Tighten any loose terminals or con-
nectors.
Servomotor
Rotates without
Reference Input
A SERVOPACK fault occurred. – Replace the SERVOPACK.
Dynamic Brake
Does Not Operate
Setting for parameter Pn001.0 is
incorrect.
Check the setting of parameter
Pn001.0.
Correct the parameter setting.
Dynamic brake resistor is
disconnected.
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.
Replace the SERVOPACK, and
reduce the load to avoid disconnec-
tion.