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3-6
3-6
Main Circuit Voltage Drop
Probable cause
Item to check
Countermeasure
The fuse of the power supply for
the main circuit contactor was
blown out.
·
There is no 200 VAC output be-
tween terminals B and O.
·
Replace the Servo Driver.
the main circuit contactor was
blown out.
(Applicable to the M Series only.)
·
A power supply is connected to
terminals B and O.
·
Correct the wiring and replace
the Servo Driver.
·
Terminals B and 0 have a
ground fault and outputs from
the terminals are grounded.
·
Fix the ground fault and replace
the Servo Driver.
The fuse of the inrush current
prevention circuit was blown out.
(Applicable to the M Series only.)
·
There is no 24 VDC output on
the PON terminals or BI termi-
nals.
* Remove the short bar when
checking the voltage.
·
Replace the Servo Driver.
·
A power supply is connected to
the PON terminals or BI termi-
nals.
·
Correct the wiring and replace
the Servo Driver.
·
The PON terminals or BI termi-
nals have a ground fault and out-
puts from the terminals are
grounded.
·
Fix the ground fault and replace
the Servo Driver.
Overload
If an overload error results, turn off the power to the main circuitry and do not turn on the power for at least
10 minutes. Do not turn on the power until the causes are checked and countermeasures are taken.
If the power is turned on without taking countermeasures, the motor coil may burn out.
·
An alarm will go off if the output current of the Servo Driver is more than 120% of the rated current continu-
ously.
·
The output current continuously exceeds the rated current in the following cases:
The motor is affected by gravity torque.
The machine system has excessive friction.
The machine system does not work and the motor shaft is locked due to secular changes, deformation,
or foreign materials in the driving components.
The load inertia is excessive.
Alarm Indication
U Series: A. 71, A. 72
H Series: E22
M Series: A. L-17, A. L-18
R Series: OL
Probable cause
Item to check
Countermeasure
Motor overload.
·
The output current is more than
120% of the rated current contin-
uously.
·
The effective value of the output
current is more than 120% of the
rated current. (Use the current
monitor or indicator.)
·
Decrease the load or load iner-
tia.
·
Increase the acceleration/decel-
eration time to decrease the ac-
celeration/deceleration torque.
·
Increase the motor capacity.
·
Motor parameter settings are
wrong. (Applicable to M Series.)
·
Make motor parameter settings
correctly.
Servo Driver Errors
Chapter 3
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