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Check
Check item
point
Environment
Check ambient temperature, relative humidity, and
concentration of dust, toxic gases, and oil mist.
General
Device status
Check for abnormal vibration and noise from the device.
Supply voltage
General
(1) Insulation resistance test (between main circuit
terminal and the grounding terminal)
(2) Check for loose screws (terminal bases, etc.).
(3) Check for overheated or burnt parts.
(4) Cleaning
Main
circuit
Terminal board
Check for damages and breaks.
Smoothing capacitor
(1) Check for electrolyte leaks.
on the PC board
(2) Check whether the capacitor is swollen.
Resistor
(1) Check for cracks and discoloration.
Operation check
Carry out the sequence protector test to check the
operation of the protective and display circuits.
Control
circuit
(1) Check for burnt smell and discoloration.
Component
General
Protective
(2) Check for rust and corrosion.
check
circuit
(including
Capacitor
(1) Check for electrolyte leaks and casing deformation.
PC board)
Note: The ambient temperature affects the service life of the capacitor. See Ambient Temperature vs. Capacitor Life (Appendix).
Table 10.1 Daily and Periodic Checks
Check cycle
Checking
Daily
• ›
• ›
• ›
• ›
Checking method
Periodic
Visually and audibly
The ambient temperature should be -
10 C to +50 C (not freezing).
The ambient relative humidity should be
20% to 90% (non-condensing).
No abnormal vibration and noise should
be detected.
• ›
(1) Tighten the
(1) (2): No problem should be detected.
screws firmly.
Tightening torques (in N.m)
• ›
M3: 0.6 to 0.9
• ›
M4: 1.5 to 2.1
• ›
M5: 2.8 to 3.9
M6: 4.1 to 5.3
• ›
Visually
No problem should be detected.
(1) (2) Visually
(1) (2) No problem should be detected.
• ›
(1) Visually
(1) No problem should be detected.
• ›
Simulate the output of
The circuits should work normally.
the inverter protection
circuit.
• ›
Visually
No problem should be detected.
• ›
• ›
Visually
Typical part
Requirement
replacement
timing
–
M8: 10 to 13.5
–
M10: 21 to 28
–
5 years (Note)
–
–
5 years (Note)
Testing tools
Thermometer,
hygrometer, and
multi-meter
500V meggar
–
–
–
–
–
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