Overhead crane or bridge crane consists

CRANE PERFORMANCE CLASSIFICATIONS

How to Calculate What You Need

DWH & SH HOISTS

Toyo DWH and SH hoists are classified to the STN ISO 4301 and FEM (Federation Europeenne de la Manutention) standards.  These standards help users understand which type of hoist they require to do the work they will utilize the hoist for.

The classification of the hoist and its mechanisms are specified on the base (light, medium, heavy, very heavy) and in the operation cycles number. The correct classification ensures the correct use of the equipment.

Duty Ratings


There are 6 main duty ratings for hoist, trolley, crab units and end carriage units, including ‘M3‘, ‘M4’, ‘M5‘, ‘M6‘, ‘M7‘ and ‘M8‘. When a duty rating increases this is achieved by the hoist unit incorporating much bigger and heavier duty components, such as the use of over rated motors to prevent output reaching the MAX ‘ED’ (Einschaltdauer – which means MAX duty factor) of the motors, eliminating burn out and labouring.

The specifications of each duty rating:


M3 (1Bm) Duty


M3 is the lightest duty and most cost effective, designed for irregular heavy lifting (in relation to the crane’s safe working load) on the occasion when required, capable of lifting 63% of its MAX SWL up to approx. 1 hour per day of suspended operation, without decreasing parts longevity & overall life span.


M4 (1Am) Duty

M4 is for standard use and operations of hoists and carriages, designed for lifting 63% of its MAX SWL up to approx. 2 hours per day of suspended operation, without incurring excessive wear and tear, and without decreasing the life span of parts and causing motor burn out. M4 is the industry standard and typical on most cranes.


M5 (2m) Duty


M5 is for more intense day-to-day hoist and carriage workloads lifting heavier items in relation to the MAX SWL. For example an M5 will lift 63% of its MAX SWL up to approx. 4 hours per day of suspended operation without decreasing parts longevity & overall life span.


M6 (3m) Duty


M6 are ‘super duty’ hoist and carriages, designed for consistent heavy-duty operations, capable of lifting 63% of its MAX SWL up to approx. 8 hours per day of suspended operation, without decreasing parts longevity & overall life span.


M7 (4m) Duty


M7 are ‘ultra duty’ hoist and carriages, designed for consistent heavy-duty operations, capable of lifting 63% of its MAX SWL up to approx. 16 hours per day of suspended operation, without decreasing parts longevity & overall life span.


M8 (5m) Duty


M8 is the highest duty for hoist and carriages, designed for 24/7 365 heavy-duty operations, capable of lifting 63% of its MAX SWL up to approx. 24 hours per day of suspended operation, without decreasing parts longevity & overall life span.



To help you better decide which hoist best serves your needs we have provided the following charts for you to consult:

CLASSIFICATION OF CRANES/HOISTS

Group Classification.jpg

FEM/STN ISO 4301 CLASSIFICATION

Use the chart below to determine your required classification based on your usage time and the rate of loading.

Crane Operating Time Chart.jpg