Chapter 5 Trouble shooting and maintenance
5-13
5.4 Routine and periodic checks
To ensure stable and safe operations, check and maintain the inverter regularly and periodically.
The table below lists the items to be check to ensure stable and safe operations.
Check these items 5 minutes after the “Charge” indicator goes out to prevent injury to personnel.
Checking
period
Items Details
Daily 1 year
Methods Criteria Remedies
Confirm the temperature
and humidity at the
machine
○
Measure
with
thermometer and
hygrometer
according to
installation notices.
Temperature: -10 –
50
o
C (14~120
o
F)
Humidity: Below 95%
RH
Ambient
conditions
around the
machine
Are there inflammable
materials in the vicinity?
○
Visual check
Keep area clear
Improve the ambient
or relocate the drive
to a better area.
Any unusual vibration from
the machine
○
Visual,
hearing
check
No vibration
Secure screws
Installation and
grounding of
the inverter
Is the grounding resistance
correct?
○
Measure the
resistance with the
Ground Resistor
200V series: below
100
Ω
400V series: below
10
Ω
Improve the
grounding
Input power
voltage
Is the voltage of the main
circuit correct?
○
Measure
the
voltage with a
multi-tester
Voltage must conform
with the specifications
Improve input voltage
Are secure parts loose?
○
Is the terminal base
damaged?
○
External
terminals and
internal
mounting
screws of the
inverter
Visual rust stains present?
○
Visual check
Check with a
screwdriver
Secure terminals and
no rust
Secure or send back
for repair
Any unusual bends or
breaks?
○
Internal wiring
of the inverter Any damage of the wire
insulation?
○
Visual check
No abnormalities
Replace or send back
for repair
Heat sink
Excessive dust or debris?
○
Visual check
No abnormalities
Clean up debris or
dust
Conductive metal shavings
or oil sludge present?
○
Printed circuit
board
Discolored, overheated, or
burned parts
○
Visual check
No abnormalities
Clean or replace the
circuit board
Unusual vibration and noise
○
Visual or hearing
check
Replace the cooling
fan
Cooling fan
Excessive dust or debris?
○
Visual
check
No abnormalities
Clean fan
Excessive dust or debris?
○
Visual check
No abnormalities
Clean component
Power
component
Check resistance between
each terminals
○
Measure with a
multi-tester
No short circuit or
broken circuit in
three-phase output
Replace power
component or
inverter
Any unusual odor or
leakage
○
Capacitor
Any deformity or
protrusion
○
Visual check
No abnormalities
Replace capacitor or
inverter
