Calculating the number of operating hours (operating time) T
i
(by the owner)
The operating time can be calculated by means of an elapsed time indicator or according to the following method:
Operating time per inspection interval:
T
i
=
(Lifting+lowering) x cycles/h x operating time/day x days/inspection interval
60 x hoist speed
Tab. 45
Only lifting and lowering movements are counted, long and cross travel times are not taken into consideration.
Estimating the load spectrum factor k
mi
(by the owner)
To simplify estimation, each type of load can be grouped together into k
m
load spectrum modules. The types of load
are simplified and quoted as 1/4, 1/2, 3/4 load and full load.
Dead loads are added to the loads. Loads up to 20% of the rated load capacity are not taken into consideration.
The operating time for each type of load is divided up within the inspection interval (e.g. 1 year) in terms of percentage.
The following bar diagram shows the k
m
load spectrum modules for the load conditions without load up to full load
in time increments of 5 and 10%. Larger shares of the time period must be correspondingly added together.
Load spectrum factor k
mi
can be obtained by adding together the individual k
m
load spectrum modules.
Diagram
Fig. 39
BLoad
LLoad
tTime
1 Dead load
Factor depending on the type of recording
● f = 1.1
For calculating the operating hours using an elapsed time indicator (included in the DC-Com standard scope of
delivery)
● f = 1,2
For estimating the operating hours and the load spectrum
8.3.3.3 Example: DC-Com 10-1000 1/1 H5 V4/1 in 1Am
Hoist speed 4/1 m/min
No. of cycles per hour 10 cycles/h
Lifting and lowering (2+2) m/cycle = 4 m/cycle
Operating time per day 8 h/day
Days per inspection interval 250 days/inspection interval
Tab. 46
72
21480244/181209
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