Chapter 5 Trouble shooting and maintenance
5-13
5.4 Routine periodic checks
To ensure stable and safe operation, check and maintain the inverter regularly.
The table below lists the items requiring checking to ensure safe operation.
Check these items 5 minutes after the “Charge” indicator goes out to prevent service persons from
being hurt by residual electric power.
Checking
period
Items Details
Week Year
Methods Criteria Remedies
Confirm the temperature
and humidity around the
machine
○
Measure
with
thermometer and
hygrometer
according to
installation notices.
Temperature: -10 –
50
o
C
Humidity: Below 95%
RH
Circumstances
around the
machine
Are there inflammable
materials in proximity?
○
Visual check
No foreign matters
Any unusual vibration from
the machine
○
Visual, hearing
No foreign matters
Secure screws
Installation and
grounding of
the inverter
Is the grounding resistance
/ earth-loop impedance
correct?
○
Measure the
resistance
According to national
regulations
Improve the
grounding path
Input power
voltage
Is the voltage of the main
circuit correct?
○
Measure the
voltage with a
multi-meter
Voltage must conform
with the specifications
Improve power
supply
Are secure parts loose?
○
Is the terminal base
damaged?
○
External
terminals and
internal
mounting
screws of the
inverter
Obvious corrosion?
○
Visual check
Check with a
screwdriver
(Make sure power
is OFF first)
No abnormalities or
cross-threading
Secure or send back
for repair
Trapped or over-heated?
○
Internal wiring
of the inverter Any damage of to the
insulation?
○
Visual check
No abnormalities
Inform your supplier
Heat sink
Build-up of dust deposits
○
Visual check
No abnormalities
Clean away dust
Build-up of conductive
metal or oil sludge
○
Printed circuit
board
Discolored, overheated, or
burned parts
○
Visual check
No abnormalities
Clean up or replace
the circuit board
Check if operating ok or
unusual vibration and noise
○
Visual or hearing
check
Replace the cooling
fan
Cooling fan
Build-up of dust deposits
○
Visual check
Clean, quiet,
operating OK
Clean
Build-up of dust deposits
○
Visual check
No abnormalities
Clean up
Power
component
Check circuit between
terminals
○
Measure with a
multi-tester (diode
checker)
No short circuit or
damage to input
/output circuits
Replace power
component or
inverter
Any unusual odor or
leakage of electrolyte
○
Any splits / swelling to case
or end caps?
○
DC Link
Capacitor(s)
High temperatures?
○
Visual check
No abnormalities
Replace capacitor or
inverter
