J. D. NEUHAUS PROFI 25TI, Оригинальное руководство по эксплуатации и сборке

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Page 42
MAINTENANCE
INSTRUCTIONS CONCERNING THE “MODEL FOR
DETERMINING THE ACTUAL OPERATING TIME”
The decisive factors for the mode of operation are the collective
loads with different cubic averages “k”.
The load spectrum indicates to what extent a driving mechanism, or
part of one, is subjected to its maximum stress or whether it is only
subjected to lower stresses. The cubic average (factor of the load
spectrum) is calculated using the following formula.
3
3
2
3
2 1
3
1
) ( ) (
Δ
⋅ + + ⋅ + + ⋅ + =
t t t k
γ γ β γ β
K
Definitions:
capacity bearing Load
load ultimate or Maximum
=
β
capacity bearing Load
load Dead
=
γ
time operating Total
load dead and part or load w time Op
k
. . max . .
=
time operating Total
only load dead with time Op
t
.
=
Δ
The FEM* 9.511 rule differentiates between four load spectrums,
which are identified by the definitions and by the ranges of the cubic
averages k. This classification complies with ISO 4301/1.
*FEM = Federation Europeene de la Manutention
(European Federation of Materials Handling and Storage Equipment)
The formula given for the cubic average k does not take the weight
of the harness into account. This is permissible if the ratio
05 . 0
≤
capacity bearing Load
harness of Weight
applies.
To determine the mode of operation for calculating the partial
operating times (actual operating time), the following load spectrum
diagrams can also be used.
Load spectrum diagrams
Load spectrum Definition
Cubic
average
Load spectrum factor
1
(light)
L1
Driving mechanisms or parts thereof, which are only subject to the
maximum stress in exceptional circumstances and are only
subject to very low stresses continuously.
k
≤
0.50
k
m
= k
3
= 0.125
2
(medium)
L2
Driving mechanisms or parts thereof, which are subject to the
maximum stress fairly often and are only subject to low stresses
continuously.
0.50 < k
≤
0.63
k
m
= k 3 = 0.25
3
(heavy)
L3
Driving mechanisms or parts thereof, which are often subject to
the maximum stress and are continuously subject to average
stresses.
0.63 < k
≤
0.80
k
m
= k
3
= 0.5
4
(very
heavy)
L4
Driving mechanisms or parts thereof, which are regularly subject to
the maximum stress of adjacent stresses.
0.80 < k
≤
1.00
k
m
= k
3
= 1