Safe and effective operation of the hoist is dependent on correct classification of the hoist’s operation group. According to FEM9.511 the hoist’s operating group can be determined from load spectrum and average Daily operating time. 1 Load Spectrum The load spectrum can be determined from the table below | | | | Light Occasional full load Usually light load Small fixed load | Medium Occasional full load Usually light load Average fixed load | Heavy Repetitive full load Usually average load Heavy fixed load | Very Heavy Usually almost full load Very heavy fixed load | 2 Average daily operating time The average daily operating time of the hoist can be calculated from the running time of the hoisting machinery (Hours/day): Formula t=(2 x N x H x T)/(V x 60) H = average hoisting height (m) N = number of work cycles per hour (cycles/h) T = daily working time (h) V = hoisting speed (m/min) 3 Determining the operating group of the hoist When the load spectrum and the average daily operating time of the hoist are identified, the hoist’s operating group is obtained from the table below: Load Spectrum | Average daily operating time ISO(GB) / FEM (hours per day) | ≤0.5 | ≤1 | ≤2 | ≤4 | ≤8 | ≤16 | Light | | | M3 1Bm | M4 1Am | M5 2m | M6 3m | Medium | | M3 1Bm | M4 1Am | M5 2m | M6 3m | M7 4m | Heavy | M3 1Bm | M4 1Am | M5 2m | M6 3m | M7 4m | | Very Heavy | M4 1Am | M5 2m | M6 3m | M7 4m | | | 4 Safe working principles Carefully following safe working principles is one of the most effective ways of preventing damage to property and injury to personnel. The operator, service man and work manager for the hoist should be familiar with the safe working principles for the hoist. A service team from customer or third party trained by manufacturer for operating the hoist and any maintenance services is needed. Misuse of the hoist or improper servicing may result in an accident that cannot be prevented by the safety equipment. Training in operation and servicing the hoist, foresight and care are essential in order to prevent accidents.
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