YASKAWA SGMSS - Troubleshooting for Malfunction Without Alarm Display

9.1 Troubleshooting
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9.1.4 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 9.5 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 dis-
connected.
Check the wiring.
Correct the wiring.
Overloaded Run under no load.
Reduce load or replace with larger capacity servomo-
tor.
Encoder type differs from parame-
ter setting.
Check incremental or absolute encoder. Set parameter Pn002.2 to the encoder type being
used.
P-OT or N-OT input signal stays
OFF.
Check the Overtravel Input signal. Turn ON the Overtravel Input signal.
A SERVOPACK fault occurred. A SERVOPACK board fault occurred.
Replace the SERVOPACK.
Servomotor
Moves In-
stantaneous-
ly, then Stops
Incorrect servomotor wiring
Check the servomotor wiring. Correct the servomotor wiring.
Incorrect encoder wiring
Check the encoder wiring. Correct the encoder wiring.
Servomotor
Speed
Unstable
Wiring connection to motor defec-
tive
Check connection of power lead (phases-
U, -V, and -W) and encoder connectors.
Tighten any loose terminals or connectors.
Servomotor
Rotates
Without
Reference
Input
A SERVOPACK fault occurred. A SERVOPACK board fault occurred.
Replace the SERVOPACK.
Dynamic
Brake (DB)
Does Not
Operate
Incorrect parameter setting Check the setting of parameter Pn001.0. Correct the parameter setting.
DB resistor was disconnected Excessive moment of inertia, motor
overspeed, DB frequently activated?
Replace the SERVOPACK, and reconsider the load.
DB drive circuit is faulty. DB circuit parts are faulty.
Replace the SERVOPACK.
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