Specifications for the number of starts and the interval time of the motor during dynamic balance testing
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When conducting dynamic balance tests on electric motors (including DC motors), the start-up interval is as follows: (1) For motors with a power of 200 kW or less (all 380V motors and 220V DC motors), the interval is 0.5 hours. (2). 200-500kW motors, with an interval of 1 hour. Including: condensate pump, condensate lift pump, pre-pump, shore make-up water pump, boiler circulation pump, #3 conveyor belt, #6 conveyor belt. (3) For motors of 500kW and above, the time interval is 2 hours. Including: electric pumps, coal crushers, coal grinders, forced draft fans, primary fans, suction fans, circulation pumps, and heat network circulation pumps. If these motors are started from 0 using an inverter, do they still need to comply with the above regulations during the dynamic balance test? ? ?
Where do the time regulations come from? Rules and regulations set by oneself – which standards?
Is this startup interval time specified by some standard or determined by the company?
Could the original poster please indicate where this rule comes from? Is it mandatory?
This must be some company’s own set of operating procedures
Yes, I think such requirements aren’t necessary for motors driven by frequency converters, so I’d like to know