142
第
十
章
第
十
章
第
十
章
Ch
ap
ter
8
Chapter 8 Maintenance and repair
8-1. Inspection and maintenance
During normal use of the inverter, in addition to routine inspections, the regular inspections are
required (e.g. the overhaul or the specified interval, and the interval shall not exceed 6 months),
please refer to the following table to implement the preventive measures.
Check Date
Check
Points
Check
Items
Check to be done
Method
Criterion
Rou-
tine
Regu
lar
√
Display
LED
display
Whether display is abnormal or
not
Visually check
As per
use status
√
√
Cooling
system
Fan
Whether abnormal noise or
vibration exists or not
Visually and
audibly check
No abnormal
√
Body
Surroun
ding
conditio
ns
Temperature, humidity,
dust, harmful gas.
Visually check
with smelling
and feeling
As per Section
2-1
√
Input/
output
termi-
nals
Voltage
Whether input/output voltage
is abnormal or not
Test R, S, T and
U, V, W
terminals
As per
standard
specifications
√
Main
circuit
Overall
Whether these phenomenon of
loose fastenings, overheat,
discharging, much dust, or
blocked air duct exist or not
Visually check,
tighten and clean
No abnormal
Electro-
lytic
capaci-
tance
Whether appearance is abnormal
or not
Visually check
No abnormal
Wires
and
conduct
ing bar
Whether they are loose or not
Visually check
No abnormal
Termi-
nals
If screws or bolts are loose or not Tighten
No abnormal
"√" means routine or regular check to be needed
Do not disassemble or shake the device gratuitously during check, and never unplug the
connectors, otherwise the system will not run or will enter into fault state and lead to component
failure or even damage to the main switching device such as IGBT module.
The different instruments may come to different measurement results when measuring. It is
recommended that the pointer voltmeter shall be used for measuring input voltage, the rectifier
voltmeter for output voltage, the clamp-on ammeter for input current and output current, and the
electric wattmeter for power.
8-2. Parts for regular replacement
To ensure the reliable operation of inverter, in addition to regular care and maintenance, some
internal mechanical wear parts(including cooling fan, filtering capacitor of main circuit for energy
storage and exchange, and printed circuit board) shall be regularly replaced. Use and replacement for
such parts shall follow the provisions of below table, also depend on the specific application
environment, load and current status of inverter.
