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2. DIRECT DRIVE MOTOR
2 - 6
2.3.6 Inspection
WARNING
Before starting maintenance and/or inspection, turn off the power and wait for 15
minutes or more until the charge lamp turns off. Then, confirm that the voltage
between P(
) and N( ) is safe with a voltage tester and others. Otherwise, an
electric shock may occur. In addition, always confirm from the front of the servo
amplifier, whether the charge lamp is off or not.
To avoid the risk of electric shock, only qualified personnel should attempt
inspections. For repair, contact your local sales office.
CAUTION
Do not disassemble and/or repair the equipment on customer side.
It is recommended to make the following checks periodically.
(a) Check the direct drive motor bearings, etc. for unusual noise.
(b) Check the cables and the like for scratches and cracks. Especially when the junction cable is movable,
perform periodic inspection according to operating conditions.
(c) Check the direct drive motor rotor (output shaft) and coupling for misalignment.
(d) Check the power supply connector and encoder connector tightening for looseness.
2.3.7 Life
The following parts must be replaced periodically as listed below. If any part is found faulty, it must be replaced
immediately even when it has not yet reached the end of its life, which depends on the operating method and
environmental conditions. For parts replacement, please contact your local sales office.
Parts name Guideline of life Remarks
Bearings 20,000 to 30,000 hours
Encoder 20,000 to 30,000 hours
Absolute position
storage unit (option)
20,000 to 30,000 hours
Battery MR-J3BAT
(option)
5,000 hours
(battery life with power off)
The Guideline of Life field gives the reference time. If any fault is found
before this time is reached, the parts must be replaced.
When the direct drive motor is run at rated speed under rated load, bearings should be exchanged in 20,000 to
30,000 hours as a guideline. This differs on the operating conditions. The bearings must also be replaced if
unusual noise or vibration is found during inspection.