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9.3 Troubleshooting Malfunction Based on Operation and Conditions of the Servomotor
9-25
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 Probable Cause Investigative Actions Corrective Actions
Servomotor Does
Not Start
The control power supply is not
ON.
Check voltage between contr
ol
power terminals.
Correct the wiring.
The main circuit power supply is
no
t ON.
Check the voltage between main
circuit power terminals.
Correct the wiring.
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.
Wiring for servomotor ma
in circuit
cable or linear scale connection
cables is disconnected.
Check the wiring. Correct the wiring.
Overloaded
Run under no load and check the
load status.
Reduce load or replace with larger
capacity servomotor.
Linear scale type differs from
parameter setting (Pn002.2).
Check the settings for parameter
Pn002.2.
Set parameter Pn002.2 to the linear
scale type being used.
Speed/position references not input
Check the allocation status of the
input signals.
Allocate input signals so that the
speed/position ref
erence is input
correctly.
Settings for the input signal
selec-
tions (Pn50A to Pn50D) is incor-
rect.
Check the settings for parameters
Pn5
0A to Pn50D.
Correct the settings for parameter
Pn50A to Pn50D.
Servo ON signal (/S-ON) stays
OFF.
Check the settings for parameters
Pn50A.0 and Pn50A.1.
Set the parameters Pn50A.0 and
Pn50A.1 to turn
the /S-ON signal
ON.
/P-CON input function setting is
i
ncorrect.
Check the settings for 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 linear scale,
turn
the SEN input signal ON.
Reference pulse mode selection is
i
ncorrect.
Check the Pn200.0 setting and the
reference pulse form.
Match the Pn200.0 setting and the
reference pulse form.
Speed control: Speed reference
input is incorrect.
Check V-REF and SG to confirm if
the control meth
od and the input are
agreed.
Correct the control method selec-
tion parameter, and the input signal.
Force control: Force reference input
i
s incorrect.
Check V-REF and SG to confirm if
the control meth
od and the input are
agreed.
Correct the control method selec-
tion parameter, and the input signal.
Position control: Reference pulse
input is incorrect.
Check Pn200.0 reference pulse
form
and sign + pulse signal.
Correct the control method selec-
tion parameter, and the input signal.
Position error clear (/CLR) input
ha
s not been turned OFF.
Check /CLR input signals (CN1-14
and -15).
Turn /CLR input signals OFF.
The forward run prohibited (P-OT)
and reverse run prohib
ited (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 and /HWBB2
input signal.
Set the /HWBB1 and /HWBB2
input sig
nal 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.
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