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14. Inspection and maintenance
• The equipment must be inspected every day.
If the equipment is not inspected and maintained, errors and malfunctions may not be discovered
which could lead to accidents.
• Before inspection, perform the following steps.
(1) Shut off all input power to the inverter.
(2) Wait at least 15 minutes and check to make sure that the charge lamp is no longer lit.
Instruction
(3) Use a tester that can measure DC voltages (400V DC or more), and check that the voltage to the
DC main circuits (across PA-PC) does not exceed 45V.
Performing an inspection without carrying out these steps first could lead to electric shock.
Be sure to inspect the inverter regularly and periodically to prevent it from breaking down because of the environment
of use, such as temperature, humidity, dust and vibration, or deterioration of its components with aging.
14.1 Regular inspection
Since electronic parts are susceptible to heat, install the inverter in a cool, well-ventilated and dust-free place.
This is essential for increasing the service life.
The purpose of regular inspections is to maintain the correct environment of use and to find any sign of failure or
malfunction by comparing current operation data with past operation records.
Subject of
inspection
1. Indoor
environment
2. Units and
components
3. Operation
data
(output side)
*)
The voltage measured may slightly vary from voltmeter to voltmeter. When measuring the voltage,
always take readings from the same circuit tester or voltmeter.
Warning
Inspection procedure
Inspection
Inspection item
cycle
1) Dust, temperature
Occasionally
and gas
2) Drop of water or
Occasionally
other liquid
3) Room temperature
Occasionally
1) Vibration and noise
Occasionally
1) Load current
Occasionally
2) Voltage (*)
Occasionally
3) Temperature
Occasionally
N-1
Criteria for judgement
Inspection method
1) Visual check, check
1) Improve the environment if
by means of a
it is found to be
thermometer, smell
unfavorable.
check
2) Visual check
2) Check for any trace of
water condensation.
3) Check by means of
3) Max. temperature: 60°C
a thermometer
Is something unusual is
found, open the door and
check the transformer,
Tactile check of the
reactors, contactors, relays,
cabinet
cooling fan, etc., inside. If
necessary, stop the
operation.
Moving-iron type AC
To be within the rated
ammeter
current, voltage and
temperature.
Rectifier type AC
No significant difference
voltmeter
from data collected in a
Thermometer
normal state.
E6581595
14
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