8-7
8-3 Troubleshooting
8
Troubleshooting
12 Overvoltage
Occurs when power
supply is turned ON.
• Main circuit power
supply voltage is
outside allowable
range.
• Change the main
circuit power supply
voltage to within
allowable range.
Occurs when Servomo-
tor is decelerating.
• Load inertia is too
great.
• Calculate the regener-
ative energy, and
connect an External
Regeneration Resistor
with the required
regeneration
absorption capacity.
• Extend the
deceleration time.
• Main circuit power
supply voltage is
outside allowable
range.
• Change main circuit
power supply voltage
to within allowable
range.
Occurs during descent
(vertical axis).
• Gravitational torque is
too large.
• Add a counterbalance
to the machine to
lower gravitational
torque.
• Slow the descent
speed.
• Calculate the regener-
ative energy, and
connect an External
Regeneration Resistor
with the required
regeneration
absorption capacity.
13
Main power supply
undervoltage
Occurs when the Servo
Drive is turned ON.
• The power supply
voltage is low.
• Momentary power
interruption occurred.
• Power supply capacity
is insufficient.
• The power supply
voltage is reduced
because the main
power supply is OFF.
• The main power
supply is not input.
• Check the power
supply capacity.
• Change the power
supply.
• Turn ON the power
supply.
• Extend the
Momentary Hold Time
(Pn6D).
• Phase loss. • Correctly connect the
phases of the power
supply voltage.
• Correctly connect the
single phase.
• The main circuit power
supply is damaged.
• Control PCB
error.
•
Replace the Servo
Drive.
Alarm
code
Error Status when error occurs Cause Countermeasure
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