Fuji Electric RHC-D 690V Series, Руководство пользователя

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8.2 Periodic Inspection
Before performing periodic inspection, be sure to stop the operation, shut down the power, and remove the front
cover. According to the items listed in Table 8.2-1, perform periodic inspection including points that cannot be
inspected when the power is ON.
After turning the power OFF, make sure that the charging lamp (CHARGE) is turned OFF and the DC voltage across
the terminals P(+) and N(-)and the filtering capacitor has dropped to the safe level (+25 VDC or below) using a
multimeter or the like. This is because even if the power is shut down, the smoothing capacitors remain charged and
require time to be discharged.
Table 8.2-1 List of Periodic Inspections
Check point Check item How to inspect Evaluation criteria
Environment 1) Check the ambient temperature,
humidity, vibration, and atmosphere
(dust, gas, oil mist, or water drops).
2) Check that tools or other foreign
materials or dangerous objects are not
left around the equipment.
1) Check visually or
measure using apparatus.
2) Visual inspection
1) The standard specifications
must be satisfied.
2) No foreign or dangerous
objects are left.
Voltage Check that the AC and DC circuit
voltages are correct. Measure the voltages using
a multimeter or the like. The standard specifications
must be satisfied.
Monitor
displays
1) Check that the display is clear.
2) Check that there is no missing part in
the displayed characters.
1), 2)
Visual inspection
1), 2)
The display can be read
and there is no fault.
Frame, covers
and other
structural parts Check for:
1) Abnormal noise or excessive vibration
2) Loose bolts (at clamp sections).
3) Deformation and breakage
4) Discoloration caused by overheat
5) Contamination and accumulation of
dust or dirt
1) Visual and auditory
inspection
2) Retighten.
3), 4), 5)
Visual inspection
1), 2), 3), 4), 5)
No abnormalities
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Common 1) Check that bolts and screws are tight
and not missing.
2) Check the devices and insulators for
deformation, cracks, breakage and
discoloration caused by overheat or
deterioration.
3) Check for contamination or
accumulation of dust or dirt.
1) Retighten
2), 3)
Visual inspection
1), 2), 3)
No abnormalities
Note: Discoloration of bus
bars, if caused, is regarded as
normal in the characteristics.
Conductors
and wires 1) Check conductors for discoloration
and distortion caused by overheat.
2) Check the sheath of the wires for
cracks and discoloration.
1), 2)
Visual inspection
1), 2)
No abnormalities
Terminal
blocks Check that the terminal blocks are not
damaged. Visual inspection No abnormalities
DC link bus
capacitor
(Smoothing
capacitor) 1) Check for electrolyte leakage,
discoloration, cracks, and swelling of
the casing.
2) Check that the safety valve does not
protrude or extend remarkably.
1), 2)
Visual inspection
1), 2)
No abnormalities
Resistors 1) Check for abnormal odor or cracks in
insulators caused by overheat.
2) Check for wire breakage.
1) Olfactory and visual
inspection
2) Check the wires visually,
or disconnect either wire
and measure the
conductivity with a
multimeter.
1) No abnormalities
2) Within about ±10% of the
indicated resistance
Transformer
and reactor Check for abnormal roaring noise and
odor. Auditory, visual, and
olfactory inspection No abnormalities
Magnetic
contactor
and relay 1) Check for chatters during operation.
2) Check that the contact surface is not
rough.
1) Auditory inspection
2) Visual inspection 1), 2)
No abnormalities
8-2