Troubleshooting Malfunction Based On Operation And Conditions Of The Servomotor - YASKAWA SGDV 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
9-18
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).
Speed/position references not input
Settings for the input signal selec-
tions (Pn50A to Pn50D) is incor-
rect.
Servo ON signal (/S-ON) stays
OFF.
/P-CON input function setting is
incorrect.
/SEN input is OFF.
Reference pulse mode selection is
incorrect.
Speed control: Speed reference
input is incorrect.
Torque control: Torque reference
input is incorrect.
Position control: Reference pulse
input is incorrect.
Position error clear (/CLR) input
has not been turned OFF.
The forward run prohibited (P-OT)
and reverse run prohibited (N-OT)
input signals are turned OFF.
A SERVOPACK fault occurred.
Servomotor wiring is incorrect.
Encoder wiring is incorrect.
Investigative Actions
Check voltage between control
power input terminals.
Check the voltage between main
circuit power input 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 allocation status of the
input signals.
Check the settings for parameters
Pn50A to Pn50D.
Check the settings for parameters
Pn50A.0 and Pn50A.1.
Check the settings for parameter
Pn000.1.
Check the ON/OFF status of the
SEN input.
Check the Pn200.0 setting and the
reference pulse form.
Check V-REF and SG to confirm if
the control method and the input are
agreed.
Check V-REF and SG to confirm if
the control method and the input are
agreed.
Check Pn200.0 reference pulse
form and sign + pulse signal.
Check /CLR input signals (CN1-5
and -6).
Check P-OT or N-OT input signal.
−
Check the wiring.
Check the wiring.
Corrective Actions
Correct the wiring.
Correct the wiring.
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.
Allocate input signals so that the
speed/position reference is input
correctly.
Correct the settings for parameter
Pn50A to Pn50D.
Set the parameters Pn50A.0 and
Pn50A.1 to turn the /S-ON signal
ON.
Set parameters to match the applica-
tion.
If you are using an absolute
encoder, allocate the SEN signal to
an input signal and turn it ON.
Match the Pn200.0 setting and the
reference pulse form.
Correct the control method selec-
tion parameter, and the input signal.
Correct the control method selec-
tion parameter, and the input signal.
Correct the control method selec-
tion parameter, and the input signal.
Turn /CLR input signals OFF.
Turn P-OT or N-OT input signal
ON.
Replace the SERVOPACK.
Correct the wiring.
Correct the wiring.