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Swiss Lifting Solutions
Example:
An electric chain hoist with A4 classification is used with the load type "Q4 heavy" (Q = 0.80, see table 1-1). Use per working day is
60 cycles. According to table 4-1, this results in a theoretical annual use of 6300 full load cycles. A theoretical operating period of
19.8 years can thus be derived from the theoretical total service life of 125,000 full load cycles. A general overhaul must be carried
out after 10 years at the latest, during which the further use is determined.
The actual operating time depends on the daily operating cycles and the load spectrum. Operating cycles are determined from infor-
mation provided by the operator or recorded using a meter that counts the number of operating cycles. The load spectrum is
determined in accordance with table 1-1, page 10. With these both values, the annual use can be found in table 4-1. If an operating
data acquisition system (BDE) is used, the actual use can be read out directly by our experts during the annual inspection.
The values periodically calculated or read-off are to be recorded in the inspection pass.
4.1 Determining the actual operating time
Classification according to
DIN EN 14492-2 (ISO 4301-1)
A3 (M3)
A4 (M4)
A5 (M5)
A6 (M6)
A7 (M7)
Load spectrum
Number of load cycles throughout the whole 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
500 000
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
The following theoretical operating full load cycles apply throughout the whole service life of electric chain hoists that are categorised
per DIN EN 14492-2, depending on the load spectrum:
The statutory and health requirements of the EU regulations stipulate that specific dangers which may arise from fatigue or ageing must
be prevented. Accordingly, operators of series lifting device are obliged to determine the actual use. This determination is easiest using
the calculator on our website. The actual use is recorded as part of the annual inspection by customer service engineers. A general
overhaul must be carried out when the theoretical full load cycles are reached, or after no more than 10 years. All checking and the
general overhaul itself must be arranged by the operator of the lifting device.
4 Measures for achieving safe operating periods
Figure 3-3
