Motor with a rated load operation speed is less than 1, the power supply voltage is too low. 2, the load is too large. 1, with a voltmeter, multimeter, check motor input source voltage. 2, choose a larger motor or reduce the load capacity. Troubleshooting: 1. Check the switch, fuses, each pair of contacts and lead head, Huludao fan, found fault. 2, professional check winding open circuit, short circuit, earth, etc., DK45 main fan, find out repairs. 3, choose a larger motor or reduce the load capacity, such as transmission machinery should check the mechanical jam, remove barriers. 4, the correction wiring. K40 fan, Huludao fan, Zibo Blower by Zibo Blower Factory Co., Ltd. Zibo Blower Factory Co., Ltd. (www.zibo-fengji.com) to provide "fan, mine fan, mine fan, explosion-proof fan, heat fan, Boiler Fan" and other business, the company has "cloud laugh" and other brands. Focus on the fans, ventilation equipment, etc., in Shandong Zibo have higher visibility. Welcomes inquiries, contact: An Jingli.