Frequency converter regular maintenance (4)

After dedusting of circuit board and bus bar, necessary anticorrosion treatment is carried out, insulating paint is painted, and burr must be removed after partial discharge and arc pulling are used. The damaged part of the insulating board which has been insulated and broken shall be removed, the insulation board of the corresponding insulation grade shall be isolated from it near the damage, and the insulation shall be fastened and tested and considered qualified before being put into use.