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.
Items Details
period
Methods Criteria Remedies
Ambient
conditions
around the
machine
Confirm the
temperature and
humidity at the machine
○
thermometer and
hygrometer
according to
installation notices.
-10 – 40oC
(14-120℉)
Humidity: Below
95% RH
Improve the
ambient or
relocate the
drive to a
better area.
inflammable
materials in the
vicinity?
○
Visual check Keep area clear
Installation
and grounding
of the inverter
from the machine
○
Visual, hearing check
No vibration Secure screws
Is the grounding
resistance correct?
○
Measure the
resistance with a
multi-tester
below 100Ω
Improve the
grounding
Input power
voltage
Is the voltage of the
main circuit correct?
○
Measure the voltage
with a multi-tester
conform with the
specifications
Improve input
voltage
External
terminals and
internal
mounting
screws of the
inverter
loose?
○
Visual check
Check with a
screwdriver
Secure terminals
and no rust
Secure or
send back for
repair
damaged?
○
present?
○
Internal wiring
of the inverter
breaks?
○
Visual check No abnormalities
Replace or
send back for
repair
wire insulation?
○
Heat sink
debris
○
Visual check No abnormalities
debris or dust
Printed
circuit board
metal shavings or oil
sludge
○
Visual check No abnormalities
Clean or
replace the
circuit board
overheated,
or burned
parts
○
Cooling fan
noise
○
check
No abnormalities
cooling fan
or debris
○
Visual check Clean fan
Power
component
or debris
○
Visual check No abnormalities
component
resistance
between each
terminals
○
Measure with a
multi-tester
broken circuit in
three-phase
output
power
component
or inverter
Capacitor
leakage
○
Visual check No abnormalities
Replace
capacitor or
inverter
A
protrusion
○