18
GB
Figure 4-4
5. Measures for safe working
Special risks, which can for instance occur due to
fatigue and ageing, must be eliminated under the health
and safety requirements of EC directives.
Thus, the owner of standard lifting equipment is required
to determine its actual service life. That is determined
by the after-sales service department as part of the
annual inspection. When the total theoretical number
of work cycles under load has been reached or no later
than after 10 years of service, a general overhaul must
be carried out.
All inspections and general overhauls must be carried
out at the request of the owner of the lifting equipment.
For electric chain hoists classified according to DIN
EN14492-2, the total number of load cycles depending
on the load condition is shown in table 5-1.
5.1. Determination of actual use S
The actual use depends on the daily operating time and
the load conditions.
The determination of the operating time is based on
the owner’s information or logged by an operating
data counter. The load conditions are determined in
accordance with Table 2-1 - Load conditions. From
these two pieces of information, the annual usage
time shown in Table 5-2 - Annual Usage Time can be
deducted.
For electric hoists equipped with a BDE
(Betriebsdatenerfassungs-Gerät = operating data
logging device), the actual use can be read out directly
by our competent employee.
CAUTION:
The values calculated or read from time
to time must be entered in the service logbook.
5.2. General overhaul
A general overhaul must be carried out when the
theoretical limit of the total number of cycles under load
is reached, or no later than after 10 years if there is no
work data recording system. In that case, the hoist is
refurbished to enable it to be used safely for a second
period of use. The components are tested and changed.
Testing and approval for a future period of use must be
carried out by a person skilled in the area and authorised
by the manufacturer or by the manufacturer itself.
The specialist defines:
– the new theoretical usage value,
– the maximum operating time until the next general
overhaul.
The data are recorded in the service logbook.
Table 5-1: Total number of work cycles under load
Classification according to
DIN EN 14492-2 (ISO 4301-1)
A3 (M3)
A4 (M4)
AS (M5)
A6(M6)
A7 (M7)
Load condition
Number of load cycles over the entire service life
Q2 = 0.50
250,000
500,000
1,000,000
2,000,000
4,000,000
Q3 = 0.63
125,000
250,000
5,000,000
1,000,000
2,000,000
Q4 = 0.80
63,000
125,000
250,000
500,000
1,000,000
Q5 = 1.00
31,500
63,000
125,000
250,000
500,000
Содержание tralift TT 1000
Страница 65: ......
Страница 66: ...148185 ind 04 08 20 COPYRIGHT...
