COMEUP Chain Hoist (Ver:02) - Manual (Page 8)

6
Determination of the FEM Classification
The service life of the product is significantly dependent on the frequency at which it is operated.
To ensure long service life, operate the winch within its rated percentage duty cycle (%ED).
The rated percentage duty cycle (%ED) is expressed by the duty factor (%ED) obtained at the
rated voltage and the frequency at 63% of the rated load.
( lifting time + lowering time )
Percentage duty cycle (%ED) ------------------------------------------------------------------ X 100 (%)
( Duty Factor ) ( lifting time + idle time + lowering time + idle time )
The maximum startup frequency represents the frequency of startup operations per hours,
including inching operations. The rated speed, which indicates the average speed of winding
up or down at a rated load. A cycle is limited at 10 minutes at most.
Rated Percentage Duty Cycle (%ED)
Load
Spectrum
State of Loading Cubic
Mean
Value
Average Daily
Operating Time
in hours
Calculated Total
Operating Time
in hours
Light
Occasional full load;
Usually light load;
Small fixed load
k 0.5 2 3,200
Medium
Occasional full load;
Usually light load;
Average fixed load
0.5 k
0.63
1 1,600
Heavy
Repetitive full load;
Usually average load;
Heavy fixed load
0.63 k
0.8
0.5 800
Very Heavy
Usually almost full
load; Very heavy
fixed load
0.8 k 1 0.25 400
！
WARNING
Do not exceed the rated intermittent period.
100%
40%
10%
10 40 50
100%
17 50 17 17
73%
47%
100%
40%
50 50
100%
90 10
80%
20%
Operating time%
Load%
Operating time% Operating time% Operating time%
Load% Load% Load%