Mechanical Classification (Grade) And Life - Pacific Hoists PEH050NH Operation Manual

2.2 Mechanical Classification (Grade) and Life

Safety and life of electric chain hoists are guaranteed only when the equipment is
operated in accordance with the prescribed grade.
Pacific electric chain hoists have been designed for grade 2m in the FEM Regulations
(FEM 9.5.11). Details are provided in Table 2-2. Average daily operating time and total
operating time are determined by load distribution.
Load Spectrum
(Load distribution)
1
(light)
2
(medium)
3
(heavy)
4
(very heavy)
% operating time
Load spectrum 1
Table 2-2 Mechanical classification
Definitions
Mechanisms or parts
thereof, usually subject to
very small loads and in
exceptional cases only to
maximum loads.
Mechanisms or parts
thereof, usually subject to
small loads but rather
often to maximum loads.
Mechanisms or parts
thereof, usually subject to
medium loads but
frequently to maximum
loads.
Mechanisms or parts
thereof, usually subject to
maximum or almost
maximum loads.
% operating time
Load spectrum 2
Cubic Average daily
mean Operation time
value (h)
k≦0.50 4 - 8
0.50<k
2 - 4
≦0.63
0.63<k
1 - 2
≦0.80
0.80<k
0.5 - 1
≦1.00
% operating time
Load spectrum 3
5
Total operating
time
(h)
12500
6300
3200
1600
% operating time
Load spectrum 4