IMO VXSM75-1 - Page 79

8-2 Maintenance and Inspection
8
Remarks: Remove dust using cleaning cloth
which is chemically neutral. Use a vacuum
cleaner to remove dust.
Common 1) Check if bolts and screws are tight 1) Retighten 1), 2), 3)
and not missing. 2), 3) Visual No abnormalities
2) Check the devices and insulators for inspection
deformation, cracks, breakage and
discoloration caused by overheat
and deterioration.
3) Check for dust.
Conductor 1) Check the conductor for discoloration 1), 2) Visual 1), 2)
and wire and distortion caused by overheat. inspection No abnormalities
2) Check the sheath of the cable for
cracks and discoloration.
Terminal Damage Visual inspection No abnormalities
block
Smoothing 1) Check for electrolyte leakage, 1), 2) 1), 2)
capacitor discoloration, cracks and swelling of Visual inspection No abnormalities
the case. 3) Monitor H42 Life 3) Capacitance>
2) Check for safety valve protrusion. judgment and (Initial value) x
=
measure with 0.85
3) Measure the capacitance capacitance probe
Resistor 1)Check for odor caused by overheat 1) Smelling and 1) No abnormalities
and cracked insulator. visual inspection 2) Within ± 10% of
2) Check for broken wire. 2) Visual inspection displayed resistance
or measurement
with multimeter under
disconnection of
one lead
Transformer Check for abnormal noise Hearing, visual and No abnormalities
and odor. smelling inspection
Relay 1) Check for chatters during operation. 1) Hearing 1),2)
2) Check for rough contacts. inspection No abnormalities
2) Visual inspection
Control 1) Check for loose screws and 1) Retighten. 1),2),3),4)
printed connectors. 2) Smelling and No abnormalities
circuit 2) Check for odor and discoloration. visual inspection
board, 3) Check for cracks, breakage, 3), 4) Visual
connector deformation and rust. inspection
4) Check the capacitors for electrolyte
leaks and deformation.
Cooling fan 1) Check for abnormal noise and 1) Hearing and 1) Smooth rotation
excessive vibration. visual inspection, 2),3)
2) Check for loose bolts. or turn manually No abnormalities
3) Check for discoloration caused by (be sure to turn
overheat. the power off)
4) Check that fan is operating when
2) Retighten.
power is restored.
3) Visual inspection
4) Life judgment
based on
maintenance data*
Ventilation Check the heat sink, intake and Visual No abnormalities
path exhaust ports for clogging and foreign inspection
matter.
Main circuit
Main circuit
Control circuit
Cooling system