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②
Cut off the output power (AC system power) of inverter. In the case of DSP-3334K series
product, there is no separate circuit breaker in the inverter. Turn off the switch of incoming
and distribution panel.
③
Cut off the input power of inverter (solar cell). Turn the DC switch at the bottom of inverter
to OFF position (refer to 4. Operational items)
④
Standby for more than 30 minutes after the power in the display window of inverter is
completely turned off.
⑤
Measure the input/output power terminal block inside the inverter with multi-tester to make
sure that the voltage is 0V.
⑥
Execute inspection.
Precautions after the inspection
①
Check whether the relevant works have been completely concluded or there is a worker
still performing works.
②
Check whether all the measurement instruments, tools and installation items used in the
works have been removed.
③
Check whether there are any components disassembled for the works have been left out
and whether it has been assembled in the original state prior to the works.
④
Check the tightening status of bold and presence of foreign substances inside the product.
⑤
After having completed assembly to the original state, apply input power and output power
before checking whether the inverter is operating normally by making reference to
4.
Operation
items.
7.3.1 Inspection of status of power generated/operation
①
Inspect the power generated according to insolation.
②
Power generated at the moment/previous day/accumulated is indicated in the display
panel. As such, check the current power generation status and occurrence of errors.
③
It is possible to remotely check the current status and past history conveniently if the
photovoltaic monitoring system is installed.
7.3.2 Conditions of exterior
①
Inspect presence of peeling of painting, dents and breakage in the external aspects of the
inverter.
②
Inspect for abnormality in the contact areas where power is applied due to occurrence of
corrosion.
③
Inspect the state of fixation of inverter by checking the status of fixation of the welded
parts and screws of the installation rack used exclusively to install the inverter on the wall.
④
Check whether the environment has a lot of dust. If there is a lot of dust inside the inverter,
remove the dust by using compressed air or vacuum cleaner. However, use of volatile
substances such as benzene and thinner, etc. are prohibited.
⑤
If corrosion has occurred, it would be due to the environment with abundance of moisture
or high salinity. As such, measures need to be taken to prevent humidity and air filtration. If
problems in operation occur, please contact the manufacturer.
7.3.3 Connector
①
Check breakage and deformation of input DC connector.
②
Refer to 3. Installation item. There is a possibility of loss due to fire arising from grounding
resistance in the event of occurrence of defective compression and assembly by not
complying with stipulated working procedures.
7.3.4 Electric cables
①
Check unsheathing and cut in the cable.
②
Check the state of compression and tightening of screw at the area of use of compression
terminal block.
7.3.5 FAN (limited to corresponding model)
①
Check the status of FAN operation on the lateral aspect of the inverter.
②
FAN operates and stops automatically according to the internal temperature of the inverter.
As such the stoppage of FAN could be normal. Inspect by making reference to the internal
