Fuji Electric FRENIC-Multi - Page 182

7-2
Table 7.1 List of Periodic Inspections (Continued)
Check part Check item How to inspect Evaluation criteria
Keypad
1) Check if the display is clear.
2) Check if there is missing parts in
the characters.
1), 2)
Visual inspection
1), 2)
The display can
be read and
there is no fault.
Structure such
as frame and
cover
1) Abnormal noise and excessive
vibration
2) Loosen bolts (tightened parts)
3) Deformation and breakage
4) Discoloration and deformation
caused by overheat
5) Check for foulness and dust.
1) Visual or hearing
inspection
2) Retighten.
3), 4), 5)
Visual inspection
1), 2), 3), 4), 5)
No abnormalities
Common
1) Check if bolts and screws are
tight and not missing.
2) Check the devices and insulators
for deformation, cracks, breakage
and discoloration caused by
overheat and deterioration.
3) Check for foulness and dust.
1) Retighten.
2), 3)
Visual inspection
1), 2), 3)
No abnormalities
Conductor
and wire
1) Check the conductor for
discoloration and distortion
caused by overheat.
2) Check the sheath of the cable for
cracks and discoloration.
1), 2)
Visual inspection
1), 2)
No abnormalities
Terminal
block
Check that the terminals are not
damaged.
Visual inspection No abnormalities
DC link bus
capacitor
1) Check for electrolyte leakage,
discoloration, cracks and swelling
of the case.
2) Check if the safety valve does not
protrude remarkably.
3) Measure the capacitance if
necessary.
1), 2)
Visual inspection
3) Measure
discharge time
with capacitance
probe.
1), 2)
No abnormalities
3) The discharge
time is not
shorter than time
specified by the
replacement
manual.
Braking
resistor
1) Check for odor caused by
overheat and cracked insulator.
2) Check for broken wire.
1) Smelling and
visual inspection
2) Visual inspection
or measurement
with multimeter
under
disconnection of
one lead
1) No abnormalities
2) Within ± 10% of
the specified
resistance
Transformer
and reactor
Check for abnormal roaring noise
and odor.
Hearing, visual and
smelling inspection
No abnormalities
Main circuit
Magnetic
contactor
and relay
1) Check for chatters during
operation.
2) Check for rough contacts.
1) Hearing
inspection
2) Visual inspection
1), 2)
No abnormalities