Yaskawa SGDS Sigma III Servo Amplifier - Manual (Page 310)

10.1 Troubleshooting
10-21
10.1.5 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 10.5 Troubleshooting for Malfunction without Alarm Display
Symptom Cause
Inspection Corrective Actions
: Turn OFF the servo system before executing operations.
Servomotor
Does Not
Start The control power supply is not ON. Check voltage between power supply
terminals. Correct the power circuit.
The main circuit power supply is not
ON. Check the voltage between power supply
terminals. 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
disconnected. Check the wiring. Correct 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.
Servo ON (SV_ON) command is not
sent. Check the command sent from the host
controller. Send the Servo ON (SV_ON) command.
Sensor ON (SENS_ON) command is
not sent. Check the command sent from the host
controller. Send the command in the correct SERVOPACK
sequence.
P-OT and N-OT inputs are turned
OFF. Check the overtravel input signal. Turn the overtravel input signal ON.
A SERVOPACK fault occurred. A SERVOPACK board 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
Speed Unsta-
ble Wiring connection to motor 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 A SERVOPACK fault occurred. A SERVOPACK board 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
activated occurred. Replace the SERVOPACK, and reconsider the load.
DB drive circuit fault DB circuit parts are faulty. Replace the SERVOPACK.