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11.2.3 Maintenance (Once A Year)
Item Check method
Exterior of the inverter
Check the following items, and correct immediately those fail-
ing to meet relevant requirements:
• Check whether there are flammable objects on the top of the
inverter.
• Check whether the welding points between the inverter and
foundation steel plate are firm and if there is corrosion.
• Check whether the enclosure of the inverter is damaged,
painted, or oxidized.
• Check whether the monitoring window and cabinet door can
be opened flexibly.
• Check whether the sealing strip is fixed properly.
Interior of the inverter
Check whether there are foreign objects, dust, dirt, and con-
densed water inside the inverter.
Wiring and cable layout
Start to inspect after completely powering down the internal
devices of the inverter. For any non-conformances found dur-
ing the inspection, correct them immediately.
• Check whether the cable layout is normal and whether there
is a short circuit. For any non-conformances found during the
inspection, correct them immediately.
• Check whether all inlet and outlet holes of the inverter are
well sealed.
• Check whether water leaks into the inverter.
• Check whether the power cables are loose, and fasten them
again by the torque specified previously.
• Check whether the power cables and control cables are
damaged, especially the part in contact with the metal
enclosure.
• Check whether the insulation tapes on the power cable termi-
nals fell off.
Ground connection and
equipotential connection
• Check whether the ground connection is correct and the
grounding resistance shall be no more than 4 Ω.
• Check whether the internal equipotential connection is
correct.
Fan
• Check the running status of fans.
• Check whether the fan blade rotates smoothly.
• Check whether there is abnormal noise during the operation
of the fans.
11 Routine Maintenance System Manual
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