REMA LK-13 Series, Руководство пользователя

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48
Lifting
he
ig
ht
[
m
]
Maintenance work on trolley
The checks and maintenance work on the motorised trolley and push trolley have to be done in
accordance with table 8 of point 7.1.
1.1.41
Adjustment of air gap for trolleys
If the brake linings are worn such that the air gap is about 0,9 mm it is necessary to adjust them.
10. Dismantle cover (1).
11. Loosen fan screws (2).
12. Remove rubber gasket (3) and put a thickness gauge 0,25 mm
between plate (4) and anti- sticking plate (5).
13. Tighten screw (6) so far that you can remove the thickness gauge
easily.
14. Tighten fan screws (2) symmetrically. Tighten first the screws
opposite the key (torque 4-5,5 Nm).
15. Tighten screws (6) again.
16. Remove thickness gauge.
17. Assemble fan cover (1).
18. Watch the test run of the trolley.
Figure 11: Construction of the brake of a double speed trolley
3
1
2
6
4
5
Duty rate of an electric chain hoist
The duty rate and the number of operating cycles in one
hour must not be higher than as on the specification plate
of the hoist or in a technical data table.
(European regulation FEM 9.682)
The duty rate, expressed as the cyclic duration factor
(c.d.f.) is the ration of
1 lifting cycle
lifting break time lowering break time
time [min]
running time to running time + period of rest
Formula 2:
c.d.f.
ED
running time x 100%
running time + period of rest

The duty rate is limited by the permissible degree of heat in the lifting motor. The running time is dependent on the
necessary lifting height, lifting speed of the electric chain hoist and the number of lifting motions required for a particular
transport procedure (unloading trucks, feeding machines). It is difficult in practice to take note of the duty rate during th e
lifting operation. We, therefore, give the following practical guidelines:
Short- time duty
Table 2: Permissible operating period without cooling interval when operation starts and with a motor temperature
of approx. 20° C.
c.d.f.
[duty rate %]
driving gear group
DIN 5684 part 3
operating period
[min]
25 % 1 Bm 20
This duty type is not permissible for the slower speed of precision hoisting motors. After having reached the maximum
running time a break is required and the hoist can be continued to be used in intermittent duty mode.
Intermittent duty
Table 3: Operation must be interrupted whenever the highest permissible operating time is reached. The following
breaks are necessary depending on the c.d.f. of the hoist::
c.d.f.
[duty rate %]
break
[min]
25 % 3times running time
Example
The electric chain hoist type 6300/1-5,6/1,4 is to lift loads of 6300 kg to a height of 3 m.