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11-16
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Error and Maintenance
Error Diagnosis Using the Operation Status
Symptom
Probable cause
Items to check
Measures
The PWR LED
indicator does not
light when the
power supply is
turned ON.
The power supply cable is
wired incorrectly.
Check whether the power supply
input is within the allowed power
supply voltage range.
Supply the correct power
supply voltage.
Check whether the power supply
input is wired correctly.
Wire correctly.
The motor does
not rotate even if
commands are
input from the
controller.
(Continued on next
page)
The operation command
(RUN) is OFF.
In MONITOR mode, check whether
the RUN signal is ON or OFF.
• Turn ON the operation
command (RUN).
• Wire correctly.
The forward drive prohibition
(POT) and reverse drive
prohibition (NOT) are OFF.
In MONITOR mode, check whether
the POT signal and NOT signal are
ON or OFF.
• Turn ON the POT and
NOT signals.
• If the POT and NOT inputs are
not used, set them to be disabled.
The CONTROL mode is not
correct.
Check the CONTROL mode
Selection (Pn001).
Set the CONTROL mode to
match the command type.
The error counter reset
(ECRST) is ON.
In MONITOR mode, check whether
the ECRST signal is ON or OFF.
• Turn OFF the ECRST signal.
• Wire correctly.
The COMMAND PULSE
mode (Pn007) selection is
incorrect.
Check the controller's command
pulse type and the Servo Drive's
command pulse type.
Set the Servo Drive's pulse
type to match the controller's
command pulse type.
The zero speed designation
(VZERO) is OFF.
In MONITOR mode, check whether
the VZERO signal is ON or OFF.
• Turn ON the VZERO signal.
• Wire correctly.
The internally set speeds are not set. Check the set value of Pn304 to Pn311. Set the desired speeds.
The No. 1 Torque Limit
(Pn013) or No. 2 Torque
Limit (Pn522) is set to 0.
Check the set value of Pn013 and
Pn522.
Return the set value to the
default setting.
The motor power cable is
wired incorrectly.
Check the wiring.
Wire correctly.
The encoder cable is wired
incorrectly.
The control I/O connector
(CN1) is wired incorrectly.
Check the command pulse's wiring. Wire correctly.
Check the command pulse type.
Set the Servo Drive's pulse
type to match the controller's
command pulse type.
Check the command pulse's voltage. Connect a resistor that
matches the voltage.
The power supply is not ON. Check whether the power supply is
ON and check the PWR LED indicator.
Turn ON the power supply.
Check the voltage across the power
supply terminals.
Wire the power supply's ON
circuit correctly.
The speed command is
disabled.
Check if the speed command
method is correct.
• Set the external analog
command correctly.
• Set the internal speed correctly.