Working Level of Electric Hoist and Motor (First Part)
General work level of hoist is M4 & M5. Running load and frequency are major effective factors. If full load and frequently use, required work level will be higher. The higher level is, the better motor performance will be needed, and some even need special motors. Also, hoist’s work level is not corresponding with motor’s work level.
Motor work level Grade S2-- short work: work according to given operates time under constant load. If lacks of time to reach thermal stability, then stops the motor, waits till has enough time to cool down again to ambient temperature within 2k
Motor work level Grade S3--intermittent cycle operation: according to a series of same cycle operation, each cycle includes a constant load, run time and an energy break stop time.
Motor work level starting Grade S4--duty cycle operation: according to a series of same cycle operation, each cycle including a starting time which significantly affected by temperature rise, a constant load running time and an energy break stop time.
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