High-Voltage Variable Frequency Cabinet

This is not an ad. It is real data from our customers. High-voltage motors use a lot of power. A High-Voltage Variable Frequency Cabinet lets the motor run at the speed you need. So you use less energy. First, we use cell series multi-level technology. The input current harmonic is below 2%. The power factor is above 0.95. That means you do not need an extra filter. It already meets IEEE 519 standard. Last year we put a 1000kW VFD cabinet on a ventilation fan in a Shanxi coal mine. The measured energy saving was 38%. The mine manager said the money saved in one year could buy two VFD cabinets.

Second, we add redundancy. There are multiple power cells. If one cell fails, the system automatically bypasses it. It keeps running, just at a lower power. No shutdown. We have a VFD cabinet at a cement plant in Hunan. It ran for three years without stopping. One cell gave an alarm, but the system kept going. We only replaced the cell during the annual check.

Third, we give you soft start and soft stop. The motor goes smoothly from 0Hz to 50Hz. The start current is only 1.5 times the rated current. Before, with direct start, the lights in the office would dim. Now they do not. Soft stop is even better for pumps. There is no water hammer. The pipe never breaks again. A wastewater plant in Hangzhou ran their aeration fan at full speed before. The daily power cost was 12,000 RMB. We added a Variable Frequency Cabinet and tuned it to the dissolved oxygen level. Now the daily cost is 7,000 RMB. They save 1.8 million RMB a year. They bought us dinner.