Variable frequency power supplies are composed of various components, some of which may gradually degrade and age after long-term operation, which is a primary cause of faults in variable frequency drives. To ensure the long-term normal operation of the equipment, the following components should be replaced regularly:
Cooling Fan
The power module of a variable frequency power supply is a device that generates a significant amount of heat. The heat produced during continuous operation must be expelled promptly; generally, the lifespan of a fan is about 10Kh to 40Kh. Calculating for continuous operation of the variable frequency power supply, a fan replacement is required every 2 to 3 years. There are two-wire and three-wire direct cooling fans; the two-wire fan has one positive and one negative wire, so do not connect them incorrectly during replacement; the three-wire fan has an additional detection wire, so utmost caution is necessary during replacement to avoid overheating alarms on the variable frequency power supply. AC fans typically come in 220V and 380V models; ensure the voltage level is not mixed up during replacement.
2. Filter Capacitors
Mid-Circuit Filtering Capacitors: Also known as electrolytic capacitors, their primary function is to smooth DC voltage and absorb low-frequency harmonics in DC. The continuous operation generates heat, along with the heat produced by the inverter power supply itself, which accelerates the drying of the electrolyte, directly affecting the size of its capacity. Under normal circumstances, the lifespan of capacitors in inverter power supplies is 5 years. It is recommended to check the capacitor capacity annually, and generally, if the capacity decreases by more than 20%, it should be replaced.
If a problem is found with the machine, please stop using it immediately, shut off the power to the input/output, and contact the manufacturer for repair!
