The following chart is provided to give the reader an idea of the relative significance of the duty ciycle ratings for the various electric hoists depicted in this web. The duty cycle determination for a particular application involves obtaining a significant amount of additional information and expertly applying it to the intended use. Please consult our application experts before making any duty cycle decisions. This table is given for reference only. Do not rely upon it for your application.
Most of GH hoists are in the H4-H5 range.
|Hoist Duty Class||Typical Areas of Application||Operational time Ratings at 65% Mean Load Factor|
|Uniformily Distribuited Work Perlods||Infrequent Work Periods|
|Max On Time Min/Hour||Max No. Starts/hr.||Max On Time from Cold Start||Max Number Starts|
|H1||Powerhouse and Utilities, infrequent handling. Hoists used primarily to install and service heavy equipment, loads frequently approach capacity and hoist idle for long periods between use.||7.5 minutes (12.5%)||75||15 minutes||100|
|H2||Light machine shop fabricating, service and maintenance; loads and utilization randomly distributed; rated loads infrequently handled. Total running time not over 12.5% of the work period.||7.5 minutes (12.5%)||75||15 minutes||100|
|H3||General machine shop fabricating, assembly, storage, and warehousing; loads and utilization randomly distributed. Total running time not over 25% of work period.||15 minutes (25%)||150||30 minutes||200|
|H4||Hig volume handling of heavy loads, frequently near rated load iin steel warehousing, machine and fabricating shops, mills, and foundries, with total running time not over 50% of the work period.
Manual of automatic cycling operations of lighter loads with rated loads infrequently handledsuch as in heat treating or plating operations, with total running time frequently 50% of the work period.
|30 minutes (50%)||300||30 minutes||300|
|H5||Bulk handling of material in combination with buckets, magnets, or other heavy attachments. Equipment often cab operated. Duty cycles approaching continuous operations are frequently necessary. User must specify exact details of operation, including weight of attachments.||60 minutes (100%)||600||Not Applicable
|NOTE: (1) Not applicable since there are no infrequent work periods in Class H5 service.|
Selection is based on:
- Average operating time per day
- Daily working time
- Starting frequency
The basis for calculations according to FEM standards is a 10 years lifetime for hoists.
The FEM group is determined by the daily operating time and the load spectrum.
The selection of the correct FEM group enables us to find the most suitable size of hoist for different applications.
The FEM group also specifies the ED% and the starting frequency of motors.