2 Use condition
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The allowable moment load and axial load differ with Motor size. Reconfirm that the using conditions are in
the specified limits of the Motor.
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An excessive offset load will cause permanent deflection of the rotor and the bearing abnormality. Never
apply shocks to the Motor when installing it. Be sure not to give excessive shocks to the Motor caused by
external interference when operating it.
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Flatness of the Motor mounting surface shall be 0.02 mm or less.
3 Periodical check
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Puncture of the Motor and cable shorting or snapping may occur depending on using condition and
environment. If the Motor is left in such conditions, it cannot exhibit its capability 100 % and will lead to the
trouble of the Driver Unit. We recommend to conduct the periodical check in order to detect the problem.
3. Before concluding that the system is faulty, check the matters again.
1 Alarm arises
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Did you take proper action to the alarm? Check the action described in the manual again.
2 Power does not turn on. Indication lamp does not turn on.
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Check voltage of main and control power by a tester if the voltage is in the range of specification described in
the User’s manual.
3 The Motor does not function.
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Is rotation of the Motor smooth when it is turned manually with power off? Any stickiness in motion? Does
the rotation axis have any axial play?
(Never disassemble the Motor.)
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Is the control Input/Output functioning properly?
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Monitor status of SVON, RUN and IPOS signals by I/O command through handy terminal.
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Check if the voltage of input signal and 24 V power source are stable using an oscilloscope
etc.
4 Uncontrollable Driver Unit
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Compare the current setting of parameters with the original setting at the installation. Does the PA data
(unique to individual Motor) change?
5 The Motor vibrates. Positioning is inaccurate. Alarm of software thermal arises frequently.
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Are servo parameters VG, VI, PG, FP and NP adjusted?
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Do you fasten the fixing bolts of load and the Motor mounting securely? Check and fasten them tightly if
necessary.
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Connect FG terminal of the Driver Unit to one point grounding. Ground the Motor and the Driver Unit
respectively. (Refer to User’s Manual for wiring.)
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Is any external interference with rotation in Servo lock state? (It leads to the Motor overheat if external force
is applied to it in servo lock state.)
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