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