
2.3 Check of Spindle Motor, Inverter, and Converter
2-7
2.3.4
Periodical check
Referring to the following table, establish a maintenance schedule and conduct a periodical
check. Check timing is mentioned for some items in the table; however, it is guide line.
Determine appropriate timing that best fits your machine considering operating status and
environment by increasing or decreasing the described value.
Table 2.5 Periodical check
Check object
Check procedure
Criteria
Corrective action
Item
Method
Daily maintenance
status
Review records
Viewing
Use as reference for
periodical check.
Mounting status
Bolts for mounting
Inverter, Converter, and
Motor
Viewing
Shall not become loose.
Retightening
Grounding
Grounding terminals for
Inverter, Converter, and
Motor
Viewing
Grounding shall be made
securely.
Restoration and
retightening
Coating
Paint removal or rust
Viewing
Paint damage, discoloration,
removal, or rust shall not
exist.
Rustproofing and
repainting
Connection and
electric wire
Looseness, break on wire
insulation, terminal box
Viewing
Looseness, break,
deterioration, or deformation
shall not exist.
Restoration and
retightening
Cooling fan
Vibration
Touching
Shall be free from abnormal
vibration or increase in the
amplitude.
Replacing a cooling fan
Abnormal sound
Hearing
Shall be free from abnormal
sound or increase in noise
level.
Electrolytic
capacitor
Electrolyte leakage and
expansion
Viewing
Electrolyte leakage or
expansion shall not exist.
Parts replacement
(Measure capacitance)
(Capacitance meter)
(Reading shall be within a
standard value.)
Relay and contactor
Abnormal sound during
operation
Hearing
Shall be free from abnormal
sound such as rattle sound.
Parts replacement
Resistor
Crack in insulator
Viewing
Shall be free from
abnormality.
Parts replacement
Break in wire
Circuit analyzer and
others
Reading shall be within a
standard value.
Print circuit board
Discoloration
Viewing
Abnormal or partial
discoloration shall not exist.
Print circuit board
replacement
Control circuit
Functional check
Operating Inverter
alone
Output voltage from each
phase shall not be out of
balance.
Readjust print circuit board
or repair Inverter.
Insulation resistance
Motor (Between stator
and Ground)
See section 2.3.3.
Shall be 500 VDC 10M
Ω
or
higher.
Contact our service group
if the value is less than
10M
Ω
.