Yaskawa Sigma II Series SGMVH - Manual (Page 297)

10 Inspection, Maintenance, and Troubleshooting
10.1.6 Troubleshooting for Malfunction without Alarm Display
10-16
10.1.6 Troubleshooting for Malfunction without Alarm Display
The troubleshooting for the malfunctions that causes no alarm display is listed below.
Contact your Yaskawa representative if the problem cannot be solved by the described corrective actions.
Table 10.7 Troubleshooting for Malfunction without Alarm Display
Symptom Cause
Inspection Corrective Actions
: Turn OFF the servo system before executing operations.
Servomotor
Does Not
Start The power supply is not ON. Check voltage between power supply termi-
nals. Correct the power circuit.
Wrong wiring or disconnection of
I/O signal connector CN1 Check if the connector CN1 is properly
inserted and connected. Correct the connector CN1 connection.
Servomotor or encoder wiring dis-
connected. Check the wiring. Connect the wiring.
Overloaded Run under no load. Reduce load or replace with larger capacity servomotor.
Speed/position references not input Check reference input pins. Input speed/position references correctly.
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 parameter
setting. Check incremental or absolute encoder. Set parameter Pn002.2 to the encoder type being used.
/S-ON input signal stays OFF. Check settings of parameters Pn50A.0 and
Pn50A.1. Correct the parameter setting and turn ON /S-ON input
signal.
/P-CON input function setting is
incorrect. Check parameter Pn000.1. Set parameters to match the application.
SEN input is turned OFF. Check the SEN signal input (when absolute
encoder is used). Turn SEN input signal ON.
Reference pulse mode selection is
incorrect. Check the parameter setting for the refer-
ence pulse mode. Correct setting of parameter Pn200.0.
The error clear counter (CLR) input
is turned ON. Check CLR input pins. Turn CLR input signal OFF.
The forward run prohibited (P-OT)
or reverse run prohibited (N-OT)
input signal is turned OFF. Check P-OT or N-OT input signal. Turn P-OT or N-OT input signal ON.
A SERVOPACK fault occurred. − Replace the SERVOPACK.
Servomotor
Moves In-
stantaneous-
ly, and then
Stops Servomotor wiring is incorrect. Check the servomotor wiring. Correct the servomotor wiring.
Encoder wiring is incorrect. Check the encoder wiring. Correct the encoder wiring.
Servomotor
Suddenly
Stops during
Operation
and will Not
Restart An alarm occurred while alarm reset
signal (/ALM-RST) was turned ON. Check /ALM-RST signal. Remove the cause of alarm. Turn alarm reset signal
(/ALM-RST) from ON to OFF.
Servomotor
Speed Unsta-
ble Wiring connection to servomotor is
defective. Check connection of power lead (phases U,
V, and W) and encoder connectors. Tighten any loose terminals or connectors.
Servomotor
Rotates With-
out Refer-
ence Input Speed control: Speed reference input
is incorrect. Check V-REF and SG to confirm if the con-
trol method and the input are agreed. Correct the control mode selection parameter, or the
input correctly.
Torque control: Torque reference
input is incorrect. Check T-REF and SG to confirm if the con-
trol method and the input are agreed. Correct the control mode selection parameter, or the
input correctly.
Speed reference offset is error. − Adjust the SERVOPACK offset correctly.
Position control: Reference pulse
input is incorrect. Set the parameter and cheek the reference
pulse form. Correct the control mode selection parameter, or the
input correctly.
A SERVOPACK fault occurred. − Replace the SERVOPACK.
DB (dynamic
brake) Does
Not Operate Improper parameter setting Check the setting of parameter Pn001.0. Correct the parameter setting.
DB resistor disconnected Check if excessive moment of inertia,
motor overspeed, or DB frequently acti-
vated occurred. Replace the SERVOPACK, and reconsider the load.
DB drive circuit fault − Replace the SERVOPACK.