5-11
5.4 Routine and periodic inspection
To ensure stable and safe operations, check and maintain the inverter at regular intervals.
The table below lists the items to be checked to ensure stable and safe operations.
Check these items 5 minutes after the “Charge” indicator goes out to prevent injury to personnel by
residual electric power.
Checking
period
Items Details
Daily 1Year
Methods Criteria
Remedies
Confirm the
temperature and
humidity at the
machine
○
Measure with
thermometer and
hygrometer
according to
installation notices.
Temperature:
-10 – 40
o
C (14-
120
℉
)
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 a
multi-tester
200Vclass: below
100
Ω
400V class: 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
Excessive conductive
metal shavings or oil
sludge
○
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