Chapter 5
5-8
Troubleshooting
Regeneration
overload
Occurs during
operation.
Regenerative energy
exceeds tolerance.
Calculate the regenerative
energy, and connect an exter-
nal Regeneration Resistor with
the required regeneration
absorption capacity.
Setting error in Pn600
(regeneration resistor
capacity)
Set Pn600 correctly.
Main-circuit power supply
voltage is outside toler-
ance range.
Change the main-circuit power
supply voltage to within toler-
ance range.
Overvoltage Occurs when
power supply is
turned ON.
Main circuit power supply
voltage is outside toler-
ance range.
Change the main circuit power
supply voltage to within toler-
ance range.
Main-circuit power supply is
damaged.
Replace the Servo Driver.
Occurs when Ser-
vomotor is decel-
erating.
Load inertia is too great. Deceleration time is too long.
Calculate the regenerative
energy, and connect an exter-
nal Regeneration Resistor with
the required regeneration
absorption capacity.
Main circuit power supply
voltage exceeds tolerance
range.
Reduce main circuit power
supply voltage to within toler-
ance range.
Occurs during
descent (vertical
axis)
Gravitational torque is too
large.
Add a counterbalance to the
machinery to lower gravita-
tional torque.
Slow the descent speed.
Calculate the regenerative
energy, and connect and exter-
nal Regeneration Resistor with
the required regeneration
absorption capacity.
Low voltage Occurs when the
control circuit
power supply only
is turned ON.
Control panel error Replace the Servo Driver.
Occurs when the
main circuit power
supply is turned
ON.
Main circuit power supply
voltage is outside toler-
ance range.
Change the main circuit power
supply voltage to within toler-
ance range.
Main circuit power supply is
damaged.
Replace the Servo Driver.
Display Error Status when
error occurs
Cause of error Countermeasures
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