10 Troubleshooting
10-24
10.3 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 Probable Cause Investigative Actions Corrective Actions
Servomotor Does
Not Start
The control power supply is not
ON.
Check voltage between power sup-
ply terminals.
Correct the power circuit.
The main circuit power supply is
not ON.
Check the voltage between power
supply terminals.
Correct the power circuit.
Wiring of I/O signal connector CN1
faulty or disconnected.
Check if the connector CN1 is prop-
erly inserted and connected.
Correct the connector CN1 connec-
tion.
Servomotor or encoder wiring dis-
connected.
Check the wiring. Correct the wiring.
Overloaded
Run under no load and check the
load status.
Reduce load or replace with larger
capacity servomotor.
Speed/position references not input Check reference input pins.
Input speed/position references cor-
rectly.
Setting for Pn50A to Pn50D "Input
Signal Selection" is incorrect.
Check settings of parameters
Pn50A to Pn50D.
Correct the settings for Pn50A to
Pn50D "Input Signal Selection."
Encoder type differs from parame-
ter setting (Pn002.2).
Check setting of parameter
Pn002.2.
Set parameter Pn002.2 to the
encoder type being used.
Servo ON (/S-ON) input signal
stays OFF.
Check settings of parameters
Pn50A.0 and Pn50A.1.
Set the parameters to turn the Servo
ON (/S-ON) input signal ON.
/P-CON input function setting is
incorrect.
Check parameter Pn000.1.
Set parameters to match the applica-
tion.
SEN input is OFF.
Check the ON/OFF status of the
SEN input.
If using an absolute encoder, turn
the SEN input signal ON.
Reference pulse mode selection is
incorrect.
Check the Pn200.0 setting and the
reference pulse status.
Match the Pn200.0 setting and the
reference pulse status.
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 mode selection
parameter, or the input.
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 mode selection
parameter, or the input.
Position control: Reference pulse
input is incorrect.
Check Pn200.0 reference pulse
form or sign + pulse signal.
Correct the control mode selection
parameter, or the input.
Position error pulse clear (/CLR)
input is turned ON.
Check /CLR input pins (CN1-14
and -15).
Turn /CLR input signal OFF.
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 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.
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