Momentary Rating

This rating indicates how long the hoist can be operated continuously based on the below cycle, assuming continued operation for a short time span.

 

Intermittent Rating (Percent ED) new line. Number of Starts Per Hour

This rating indicates the ED percent (ratio of motor ON-to-OFF time) and max. number of starts per hour (how many times the motor is started up in one hour) for a hoist that is operated continuously based on the below cycle, assuming continued operation or repeated starts over a long time span.

In the case of single speed:

  • Single Speed: 60%ED, 360 starts/hr
  • Dual Speed: 40/20 %ED, 240/120 starts/hr
  • Single Speed: 60min
  • Dual Speed: 30/10min

Hoist grade

  • Total operation time applies to gears, bearings and other mechanical parts; consumable parts are not taken into consideration.
  • The grade symbols are indentical to those of ISO4301. (Cranes and lifting appliance-Classification)

FEM Relation between ISO-and FEM-Denominations

The grade symbols are identical to those of FEM 9.511. (Rules for Design of Serial Lifting Equipment: Classification of Mechanisms)