Specifications

Maintenance and Check
16.2.4
Periodical check
16
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16.2.4 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 for your refer-
ence as standard timing. Determin appropriate timing that best fits your machine considering
use status and environment by increasing or decreasing the standard value.
Table 16.5 Periodical check
Check object Check procedure Criteria Corrective action
Item Method
Daily check status Review records Viewing Use as reference for periodi-
cal check.
Mounting status Bolts for mounting
Inverter and Motor
Viewing Shall not become loose. Retightening
Grounding Inverter and Motor
grounding terminals
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, deteriora-
tion, 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
Strange 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 Strange sound during
operation
Hearing Shall be free from strange
sound such as rattle sound.
Parts replacement
Resistor Crack in insulator Viewing Shall be free from abnormal-
ity
Parts replacement
Break in wire Circuit analyzer and
others
Reading shall be within a
standard value.
Printed board Discoloration Viewing Abnormal or partial discol-
oration shall not exist.
Printed board replacement
Control circuit Functional check Operating inverter
alone
Output voltage from each
phase shall no be out of bal-
ance.
Readjust printed board or
repair inverter.
Insulation
resistance
Motor (Between stator
and Ground)
See section 16.2.3
Shall be 500 VDC 10M
Ω
or
higher.
Contact our service group if
the value is less than 10M
Ω