Fuji Electric FRENIC-Ace series - Periodic Inspection; Periodic Inspection 1-Before the Inverter Is Powered on or after It Stops Running

7.3 Periodic Inspection
7-3
MAINTENANCE AND INSPECTION
Chap 7
7.3 Periodic Inspection
7.3.1 Periodic inspection 1--Before the inverter is powered ON or after it stops
running
Perform periodic inspections according to the items listed in Table 7.3-1. Before performing periodic inspection 1,
shut down the power and then remove the front cover.
Even if the power has been shut down, it takes the time for the DC link bus capacitor to discharge. After the
charging lamp is turned OFF, therefore, make sure that the DC link bus voltage has dropped to the safe level (+25
VDC or below) using a multimeter or a similar instrument.
Table 7.3-1 Periodic Inspection List 1
Check part Check item How to inspect Evaluation criteria
Structure such as
frame and cover
Check for:
1) Loose bolts (at clamp sections).
2) Deformation and breakage
3) Discoloration caused by overheat
4) Contamination and accumulation of dust
or dirt
1) Retighten.
2), 3), 4) Visual inspection
1), 2), 3), 4) No
abnormalities
(If any section is stained,
clean it with a soft cloth.)
Main circuit
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
(If any section is stained,
clean it with a soft cloth.)
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
1) Check for electrolyte leakage,
discoloration, cracks and swelling of the
casing.
2) Check that the safety valve does not
protrude remarkably.
1), 2)
Visual inspection
1), 2)
No abnormalities
Braking
resistor
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 one of the
wires and measure the
conductivity with a multimeter.
1) No abnormalities
2) Within ±10% of the
resistance of the
braking resistor
Control circuit
Printed
circuit board
1) Check for loose screws and connectors.
2) Check for odor and discoloration.
3) Check for cracks, breakage,
deformation and remarkable rust.
4) Check the capacitors for electrolyte
leaks and deformation.
1) Retighten.
2) Olfactory and visual inspection
3), 4)
Visual inspection
* Judgment on service life using
“Menu #5 Maintenance
Information” in Chapter 3,
Section 3.4.5.
1), 2), 3), 4)
No abnormalities
Cooling system
Cooling fan 1) Check for engagement or abnormal
vibration.
2) Check for loose bolts.
3) Check for discoloration caused by
overheat.
1) Turn by hand. (Be sure to turn
the power OFF beforehand.)
2) Retighten.
3) Visual inspection
* Judgment on service life using
“Menu #5 Maintenance
Information” in Chapter 3,
Section 3.4.5.
1) Smooth rotation
2), 3)
No abnormalities
Ventilation
path
Check the heat sink, intake and exhaust
ports for clogging and foreign materials.
Visual inspection No clogging or
accumulation of dust, dirt
or foreign materials.
Clean it, if any, with a
vacuum cleaner.