7.3 Periodic Inspection
7-6
7.3.2 Periodic inspection 2--When the inverter is ON or it is running
Visually inspect the inverter for operation errors from the outside without removing the covers when the inverter is
running or the power is ON.
Perform periodic inspections according to the items listed in Table 7.3-2 Periodic inspection list 2.
Table 7.3-2 Periodic inspection list 2
Is the main circuit and control circuit
voltage normal?
Measure with a
device such as a
tester.
The standard
specifications should
be satisfied.
Structural parts
such as frames,
covers
Check for abnormal noise or
excessive vibration when the cooling
fans are in operation.
Perform a visual
check, check by
listening.
There should be no
abnormalities.
Check that the input voltages of the
main and control circuits are correct.
Auditory, visual, and
olfactory inspection
There should be no
abnormalities.
Magnetic
contactors,
relays
Check for chatters when the inverter is
running.
There should be no
abnormalities.
Measure the capacitance if necessary.
* Judgment on
service life using
“Menu #5
Maintenance
Information” in
Chapter 3, Section
3.4.5.
Capacitance ≥ Initial
value x 0.85
Check for abnormal noise or
excessive vibration when the cooling
fans are in operation.
Auditory and visual
inspections
There should be no
abnormalities.
* Refer to Chapter 3 “3.4.5 Reading maintenance information “Maintenance information 5.CHE””.
[Supplementary information]
(1) The inspection interval (every year) of check items given in Table 7.3-1 and Table 7.3-2 is merely a guide.
Make the interval shorter depending on the usage environment.
(2) Store and organize the inspection results to utilize them as a guide for operation and maintenance of the
equipment and service life estimation.
(3) At the time of an inspection, check the cumulative run times on the keypad to utilize them as a guide for
replacement of parts. Refer to “7.4.1 Judgment on service life”.
(4) The inverter has cooling fans inside to ventilate itself for discharging the heat generated by the power
converter section. This will accumulate dust or dirt on the heat sink depending on the ambient environment.
In a dusty environment, the heat sink requires cleaning in a shorter interval than that specified in periodic
inspection. Neglecting cleaning of the heat sink can rise its temperature, activating protective circuits to lead
to an abrupt shutdown or causing the temperature rise of the surrounding electronic devices to adversely
affect their service life.
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