NSK EDD Megatorque Motor - Periodic Checks

10. Maintenance
— 10-2 —
10.3. Periodic Check
10.3.1. Motor
！
Caution : Never disassemble the Motor and the resolver.
 The table below shows the checklist of periodic maintenance.
 The checking interval shown in the table is for reference only. It should be decided according to
the actual use conditions and environment.
 You do not require replenish the grease of the bearing.
 We cannot repair the Motors at the User’s site regardless of the level of failure. If any problem was found
by the periodic check, please consult with NSK sales or representative.
Table 10-2: Periodic Check of Motor
Item
Checking interval
How to check
Remarks
Vibration/Noise
Daily
 Hearing
 No difference with
normal state.
Appearance
Depending on the degree
exposed to contamination
 Wipe off or blow off contaminants.
–
Insulation
Once a year
 Disconnect the Driver Unit, then check the
resistance between the Motor coil and the
ground earth with a 500v megohmmeter.
 Resistance  2 M
Refer to “Appendix 2.”
Play in bearing
Once a year
 Apply repetitive moment load less than the
limit, and feel play of the bearing.
 No play by the feel.
10.3.2. Driver Unit (Including Cables and Handy Terminal)
！
Caution : Do not disassemble the Driver Unit.
• High residual voltage may exist inside the Driver Unit for a while after the power is
turned off. (In such a case, “CHARGE LED” is on.)
 The daily check of the Driver Unit is not necessary because of the use of highly reliable semiconductors.
The checks shown in Table 10-3 require at least once a year.
Table 10-3: Periodic check of Driver Unit
Item
Interval
Checking point
Remarks
Retighten screws
Once/year
Terminal block screws.
Connector fixing screws.
–
Cleaning
Once/year
Remove dust or contaminants
outside of Driver Unit.
–
Cable check
Once/year
Visually check any damages or
cracks.
Especially when you force to bend and twist
the cables, increase the checking interval
depending on the conditions.