Celebrating China’s National Day
2026-09-30
As China celebrates its National Day, we would like to take this opportunity to extend our best wishes to our customers, partners, and friends around the world. For more than 20 years, ZFENG ELECTRIC has been focused on industrial automation and motor control solutions, providing VFDs, control ...
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Happy Mid-Autumn Festival!
2026-09-24
The Mid-Autumn Festival is a time for reunion, gratitude, and looking forward to the future. At ZFENG ELECTRIC, we’re grateful for the trust and cooperation of our customers and partners around the world. May the full moon bring peace, happiness, and success to you and your family. Wishing you a ...
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Why Does a Motor Overheat When Running at Low Frequency?
2026-08-17
When a motor is driven by a VFD at low frequency, it may run much hotter than expected. Why? 1️⃣ The Motor's Cooling Fan Runs Slower For a standard induction motor, the cooling fan is usually mounted directly on the motor shaft. When the VFD reduces the frequency: Lower Frequency → Lower Motor Speed ...
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50Hz → 25Hz: Does Motor Current Really Drop by Half?
2026-09-17
If the frequency is reduced from 50Hz to 25Hz, does the motor current also drop by 50%? Not necessarily. Reducing the VFD frequency mainly reduces the motor speed. Motor current, however, is strongly related to the load torque and operating conditions. For fans and pumps, when speed decreases, the ...
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VFD Overcurrent Fault: The Motor Isn’t Short-Circuited — So What’s Causing It?
2026-09-20
A VFD suddenly trips with an “Overcurrent” fault, but after checking the motor, there is no short circuit. So why does this happen? An overcurrent fault does not always mean that the motor is damaged. The VFD is detecting excessive output current, but the actual cause may come from the motor, load, ...
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