Fuji Electric FRENIC MEGA G2 Series - 7.3 Periodic Inspection

7.3 Periodic Inspection
7-4
7.3 Periodic Inspection
7.3.1 Periodic inspection 1--Before the inverter is powered ON or after it stops
running
Perform periodic inspection 1 according to the items listed in Table 7.3-1 Periodic inspection list 1. Before
performing periodic inspection 1, shut down the power and then remove the front cover.
It takes time for the main circuit DC part smoothing capacitor to dissipate even after turning OFF the power. To
eliminate any danger, wait until the charge lamp (CHARGE) has turned OFF, and use a device such as a tester to
ensure that the DC voltage has dropped to a safe level (25 VDC or less) before carrying out work.
Table 7.3-1 Periodic inspection list 1
Inspection location
Inspection item
Inspection method
Criteria
Structural parts
such as frames,
covers
1) Is there any bolt looseness (at
secured parts)?
2) Is there any deformation or damage?
3) Is there any discoloration due to
overheating?
4) Is there any staining or dust
adhesion?
1) Retighten
2), 3), 4)
Visual inspection
1), 2), 3), 4) There
should be no
abnormalities.
(If any section is
stained, clean it with
a soft cloth.)
Main circuit
Common
1) Are there any loose or missing bolts?
2) Is there any device or insulating
material deformation, cracking,
damage, or overheating, or any
discoloration due to degradation?
3) Is there any staining or dust
adhesion?
1) Retighten
2), 3)
Visual inspection
1), 2), 3) There
should be no
abnormalities.
(If any section is
stained, clean it with
a soft cloth.)
Conductors,
wires
1) Is there any discoloration or distortion
of conductors due to overheating?
2) Are there any wire coating tears,
cracks, or discoloration?
1), 2)
Visual inspection
1), 2) There should
be no abnormalities.
Terminal
blocks
Is there any damage?
Visual inspection
There should be no
abnormalities.
Smoothing
capacitors
1) Is there any electrolyte leakage,
discoloration, cracks, or case
expansion?
2) Is there any safety valve protrusion,
and are there any smoothing
capacitors with significant valve
expansion?
1), 2)
Visual inspection
1), 2) There should
be no abnormalities.
Breaking
resistors
1) Is there an abnormal odor due to
overheating, or insulating material
cracks?
2) Are any resistors disconnected?
1) Olfactory and
visual inspection
2) Check the wires
visually, or
disconnect either
one of the wires
and measure the
conductivity with a
tester.
1) There should be
no abnormalities.
2) Within ±10 % of
the resistance of
the braking resistor