9
Example 2: Ascertaining permissible load type:
An electric chain hoist of the ISO Group M5 is to be used for approximately 6 hours per working day, throughout its complete service life.
Consequently the electric chain hoist should be operated in accordance with the characteristics of the load type <1 light> (see table 1-1).
Table 1-1 Load collectives
Load type 1
light
k < 0.50
k = 0.50
Load type 2
medium
0.50 < k < 0.63
k = 0.63
Load type 3
heavy
0.63 < k < 0.80
k = 0.80
Load type 4
very heavy
0.80 < k < 1.00
k = 1.00
%
of bear
ing
ca
p
a
c
it
y
%
of bear
ing
ca
p
a
c
it
y
%
of bear
ing
ca
p
a
c
it
y
%
of bear
ing
ca
p
a
c
it
y
% of running time
% of running time
% of running time
% of running time
Full load by way of an
exception, however,
predominantly
low loads
Frequently fully loaded,
however continuously
lightly loaded
Frequently fully loaded,
continuous average
loading
Regularly fully loaded
k = Load collective (type of load)
Table 1-2 Operating conditions
ISO Group according
to ISO 4301-1
M3
M4
M5
M6
M7
Load collective
Average running time per working day [h]
1 - light
k < 0.50
up to
2
2 - 4
4 - 8
8 - 16
over
16
2 - medium
0.50 < k < 0.63
up to
1
1 - 2
2 - 4
4 - 8
8 - 16
3 - heavy
0.63 < k < 0.80
up to
0.5
0.5 - 1
1 - 2
2 - 4
4 - 8
4 - very heavy
0.80 < k < 1.00
up to
0.25
up to
0.5
0.5 - 1
1 - 2
2 - 4
1.2 General
description
Figure 1-1
1
4
3
2
5
6
7
1 Housing
2 Motor and brake
3 Rotor shaft with integrated
slip clutch
4 Limit switch
5 Electrical controller
6 Chain drive
7 Gearbox
Control switch
single fall
double fall
