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 i

Open the front door of the converter, open the back door, carefully check whether the AC or DC bus row is deformed, corroded and oxidized, whether the screw at the bus joint is loose or not, and whether the solid screw at the fixing point is loosened. Fixed insulation or insulation column with or wi

Dedusting frequency converter regularly, the emphasis is rectifier cabinet, inverter cabinet and control cabinet, if necessary, the rectifier module, inverter module and control cabinet can be removed from the circuit board after dust removal. Frequency converter down air inlet, upper air outlet whe

Regular dust removal check fan inlet is blocked. Monthly cleaning air filter cooling duct and internal dust.Regular inspection, should be carried out once a year: check screws, bolts and that is, plug-in, etc., whether the input-output reactor ground and phase resistance short-circuit phenomenon, no

Other breakdown1, undervoltageDescription of the inverter power input part of the problem, to be checked before they can run.2, the temperature is too highSuch as motor temperature detection device, check the motor cooling; inverter temperature is too high, check the inverter ventilation.

Overload faultOverload faults include inverter overload and motor overload. It may be due to acceleration time is too short, excessive DC braking, power grid voltage is too low, overloaded and other causes. Generally by extending the acceleration time, extended braking time, check the grid voltage.

Overcurrent faultOvercurrent fault can be divided into acceleration, deceleration, constant speed over current. It may be due to the inverter acceleration and deceleration time is too short, the load changes suddenly, the load distribution is uneven, the output short circuit and other causes. At thi

Overvoltage faultThe over-voltage of the inverter is concentrated on the DC voltage of the DC bus. Under normal circumstances, the inverter DC three-phase full-wave rectified average. If 380V line voltage calculation, the average DC voltage Ud = 1.35 U line = 513V. When an overvoltage occurs, the st

Capacitor shell expansion (also known as bulging), but also a common capacitor abnormalities. It is normal for a fuel tank to expand and contract with changes in temperature. However, when a partial discharge occurs inside the capacitor or the insulation is broken down, a large amount of gas will be

Capacitor is a fully sealed device, but due to manufacturing defects and improper use of maintenance, often lead to capacitor bleed oil, the capacitor is mainly the first part of the oil seepage casing, conductive rod sealing gasket failure, resulting in oil leakage. The second is the capacitor weld