DRV-28 inverter
s
-251-
Subject
Item
Method
Criterion
Conductor and
wire
Check whether the
conductors are deformed or
their color change due to
overheat.
Visual inspection
No exception
occurs.
Check whether the wire
sheaths are cracked or their
color changes.
Visual inspection
No exception
occurs.
Terminal block
Check whether there is
damage.
Visual inspection
No exception
occurs.
Filter capacitor
Check whether there is
electrolyte leakage,
discoloration, cracks, and
chassis expansion.
Visual inspection
No exception
occurs.
Check whether the safety
valves are released.
Determine the
service life based on
the maintenance
information, or
measure them
through electrostatic
capacity.
No exception
occurs.
Check whether the
electrostatic capacity is
measured as required.
Use instruments to
measure the
capacity.
Electrostatic
capacity ≥ initial
value × 0.85
Resistor
Check whether there is
displacement caused due to
overheat.
Olfactory and visual
inspection
No exception
occurs.
Check whether the resistors
are disconnected.
Visual inspection, or
remove one end of
the connection cable
and use a
multimeter for
measurement.
Resistance range:
±10% (of the
standard
resistance)
Transformer
and reactor
Check whether there is
unusual vibration sounds or
smells.
Auditory, olfactory,
and visual
inspection
No exception
occurs.
Electromagnetic
contactor and
relay
Check whether there are
vibration sounds in the
workshop.
Auditory inspection
No exception
occurs.
Check whether the contacts Visual inspection
No exception
