TECHTOP TD20 Series Product Manual page 88

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