34
Chapter 6: Overhaul and Maintenance
During frequency inverter normal operation, except for daily inspections, periodic (such as machine
overhaul or inspections at least every six months as required) inspections must be performed according
to the following table, to preven t trouble before it happens.
Inspectio
n period
Inspecti
on part
Inspection
items
Inspection content
Inspection
methods
Criteria
At any
time
Display
LED
display
If display is abnormal or
not?
Vision
No abnormal
At any
time
Cooling
system
Fan
If there is abnormal
vibration or abnormal
noise.
Visual
examination
and listening
No abnormal
At any
time
Noume
non
Surroundi
ng
environm
ent
Temperature
，
humidity
，
dust
，
harmful gas
Visual
examination
，
smelling
，
feeling
By 2-1 term
At any
time
Input
terminal
Voltage
If input, output voltage is
abnormal
Detect R
、
S
、
T
and U
、
V
、
W
terminal
according to the
standards
regulation
periodic
Main
circuit
panorama
If the fastener loosen ,
whether having the hot
shot trail , whether
having discharging or
not phenomenon , dust
are too much, if the
wind way is blocked up
Visual,
，
tighten
，
clean
No abnormal
Electrolitic
capacitor
If surface is abnormal
Visual
No abnormal
Wire
conductiv
e bar
Whether loosen
Visual
No abnormal
Terminal
Whether the bolt or
screw loosen
tighten
No abnormal
During the examination, not allowed to dismantle or rock a component for no reason, even pull off a
connector assembly. Otherwise, it can not run or enter malfunction display state. And it will bring faults
of the component,even damage the host switch component IGBT module. When needing
measurement, user should pay attention to various different meters which may reach very different
measurement results. Pointer voltmeter is recommended to use to measure input voltage. Rectifier
voltmeter is recommended to use to measure output voltage. Pliers galvanometer is recommended to
use to measure input and output current. And electrodynamics wattmeter is recommended to use to
measure power.
