8.4 Troubleshooting for Malfunction without Alarm Display
152
Servomotor
speed is unsta-
ble.
The connection to the servo-
motor is defective.
Check if the power line
(phase-U, V, and W) and
encoder connectors are
securely connected.
Retighten any loose termi-
nals or connectors.
The concentricity of cou-
pling between the servomo-
tor and machine shafts or
loose screws
Check the coupled section
of machine shaft.
Correct or adjust the
machine.
Rotate the servomotor with-
out load after disconnecting
the servomotor from the
machine.
The load moment of inertia
exceeds allowable value of
the SERVOPACK.
Rotate the servomotor with-
out load after disconnecting
the servomotor from the
machine.
Reduce the load.
Replace with the larger
capacity servomotor and
SERVOPACK.
Servomotor
rotates without
reference input.
The SERVOPACK is faulty. The SERVOPACK board is
faulty.
Replace the SERVOPACK.
Servomotor is
overheated.
The ambient temperature is
high.
Check if the ambient tem-
perature around the servo-
motor is 40 ° C max.
Keep the ambient tempera-
ture around the servomotor
to 40 ° C max. (Use fan or air
conditioner.)
Insufficient ventilation Check if ventilation is not
obstructed.
Maintain proper ventilation.
Overloaded Rotate the servomotor with-
out load after disconnecting
the servomotor from the
machine.
Reduce the load.
Replace with the larger
capacity servomotor and
SERVOPACK.
Servomotor
holding brake
does not oper-
ate.
The power is being supplied
to the holding brake.
Check if the power is being
supplied to the holding
brake.
Configure the circuit so that
the power supply of the hold-
ing brake is turned OFF
when holding the load with
the holding brake at the ser-
vomotor stop.
The servomo-
tor does not
stop or has dif-
ficulty to stop
when the servo
turns OFF
while the ser-
vomotor is run-
ning.
Overloaded Check the following:
• Is the load too heavy?
• Is the servomotor speed
too high?
Reconsider the load condi-
tions and replace the SER-
VOPACK.
The emergency stop circuit
is faulty.
−
Replace the SERVOPACK.
(cont’d)
Malfunction Cause Inspection Corrective Actions
TOEP_C710806_03A_1_0.book Seite 152 Montag, 2. Juli 2007 3:55 15
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