TECHTOP TD350 Product Manual page 265

TD350 Series VFD
Subject
Conductor and
wire
Terminal block
Filter capacitor
Resistor
Transformer
and reactor
Electromagnetic
contactor and
relay
Item
Check whether the
conductors are deformed or
their color change due to
overheat.
Check whether the wire
sheaths are cracked or their
color changes.
Check whether there is
damage.
Check whether there is
electrolyte leakage,
discoloration, cracks, and
chassis expansion.
Check whether the safety
valves are released.
Check whether the
electrostatic capacity is
measured as required.
Check whether there is
displacement caused due to
overheat.
Check whether the resistors
are disconnected.
Check whether there is
unusual vibration sounds or
smells.
Check whether there are
vibration sounds in the
workshop.
Check whether the contacts
are in good contact.
Maintenance and hardware fault diagnosis
Method
Visual inspection
Visual inspection
Visual inspection
Visual inspection
Determine the
service life based on
the maintenance
information, or
measure them
through electrostatic
capacity.
Use instruments to
measure the
capacity.
Olfactory and visual
inspection
Visual inspection, or
remove one end of
the connection cable
and use a
multimeter for
measurement.
Auditory, olfactory,
and visual
inspection
Auditory inspection
Visual inspection
-260-
Criterion
No exception
occurs.
No exception
occurs.
No exception
occurs.
No exception
occurs.
No exception
occurs.
Electrostatic
capacity ≥ initial
value × 0.85
No exception
occurs.
Resistance range:
±10% (of the
standard
resistance)
No exception
occurs.
No exception
occurs.
No exception
occurs.