Duke DU903, Руководство по эксплуатации

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Page 21
5-2-3 Continuous rating
Never use the hoist beyond the 20 minutes permitted per hour.
The life of the hoist depends on the conditions of the load and working frequency.
During long operating periods make sure to use the hoist within its continuous rating.
Continuous Rating means the amount of allowable usage within one hour which is 25%
or 20 minutes per hour or 300 starts per hour.
The maximum number of starts means the number of times the motor starts within the
hour.