TECHTOP TD20 Series - Page 88

TD20 Series VFD Fault Tracking
-86-
Checking part
Checking item
Checking method
Criterion
Ensure that there are no crackles
or color-changing of the protective
layers.
Visual examination
NA
Terminals
seat
Ensure that there is no damage
Visual examination
NA
Filter
capacitors
Ensure that there is no weeping,
color-changing, crackles and
cassis expansion.
Visual examination
NA
Ensure the safety valve is in the
right place.
Estimate the usage
time according to the
maintenance or
measure the static
capacity.
NA
If necessary, measure the static
capacity.
Measure the capacity
by instruments.
The static capacity
is above or equal
to the original
value x 0.85.
Resistors
Ensure whether there is
replacement and splitting caused
by overheating.
Smelling and visual
examination
NA
Ensure that there is no offline.
Visual examination or
remove one ending to
coagulate or measure
with multimeters
The resistors are
in ±10% of the
standard value.
Transformer
s and
reactors
Ensure there is no abnormal
vibration, noise and smelling,
Hearing, smelling and
visual examination
NA
Electromag
netism
contactors
and relays
Ensure whether there is vibration
noise in the workrooms.
Hearing
NA
Ensure the contact is good
enough.
Visual examination
NA
Control
circuit
PCB and
plugs
Ensure there are no loose screws
and contactors.
Fasten up
NA
Ensure there is no smelling and
color-changing.
Smelling and visual
examination
NA
Ensure there are no crackles,
damage distortion and rust.
Visual examination
NA
Ensure there is no weeping and
distortion to the capacitors.
Visual examination or
estimate the usage time
NA