Mechanical Classification (Grade) And Life - Pacific Hoists U-MEGA Series Operations Manual & Parts List

2.2 Mechanical Classification (Grade) and Lift
Safety and life for electric chain hoists are guaranteed only when the said equipment
is operated in accordance with the prescribed grade.
Single phase electric chain hoists have been designed for grade 1Am in the FEM
regulations (FEM 9.511).Details are provided in Table 2-2.
Average daily operating time and total operating time are determined by load
distribution.
Load
Spectrum
(Load
distribution)
Mechanisms or parts thereof,
1 usually subject to very small loads
(light) and in exceptional cases only to
maximum loads.
Mechanisms or parts thereof,
2
usually subject to small loads but
(medium)
rather often to maximum loads.
Mechanisms or parts thereof,
3
usually subject to medium loads
(heavy)
but frequently to maximum loads.
Mechanisms or parts thereof,
4
usually subject to maximum of
(very heavy)
almost maximum loads.
% operating time
Load spectrum 1
Table 2-2 Mechanical classification
Definitions
% operating time
Load spectrum 2
5
Cubic Average daily
mean operating
value time(h)
k≦0.50 2 - 4
0.50<k
1 - 2
≦0.63
0.63<k
0.5 - 1
≦0.80
0.80<k
0.25 - 0.5
≦1.00
% operating time
Load spectrum 3
Total
operating
time(h)
6300
3200
1600
800
% operating time
Load spectrum 4