Inhoudsopgave
Advertenties
Mounting screws and nut
9
Fixed half clamp
10
Compression pin
11
Deformation cell
12
Pull wire rope
13
4.2. Installing the load limiter on the wire
rope
IMPORTANT: Before applying a load and if no
factory presetting has been requested, make sure the
adjustment screws (rep 3 fig.2) are un-screwed to the
maximum.
Failure to do so will result in risk of destruction of micro-
switches by crushing.
If the wire rope diameter does not correspond to the
load range, the load information will be the decisive
information.
a. Position the compression pin (11) in accordance
with the force in the wire rope (See figure 3):
Position
Requirement
For a 5 to 8 mm wire rope and for
1
loads between 200 daN and 900 daN
For a 9 to 13 mm wire rope and loads
2
between 200 daN and 1850 daN
For a 14 to 16 mm wire rope and
3
loads between 200 daN and 3200 daN
b. Open the mobile half-clamp (8).
c. Make sure the pull wire rope (13) is free of any load.
d. Position the load limiter on the idle strand on the wire
rope near the fixed point, with the cable gland (2)
pointing upward.
e. Close the mobile half-clamp (8) on the wire rope.
Evenly adjust the mounting screws (9) (9 Nm) to
f.
avoid any risk of the load limiter moving with respect
to the wire rope. Too much clamping force can result
in damage to the clamp.
g. Check that the load limiter is correctly positioned by
performing a lifting movement up to the high limit
switch and check that the lifting equipment does
not touch the load limiter. If necessary, correct the
limit switch adjustment to keep sufficient clearance
between the load limiter and the pulley block. Also
check, when the pulley block is at the high limit
switch, that the load limiter does not come into
contact with the crane structure.
4.3. Load limiter electrical connection
a. Correctly secure the electrical cable of the load
limiter up to the control cabinet Installation
b. Connect the control circuit contact wires as instructed
in §4.4
Micro switch interrupting capacity: 4 A / 250
VAC.
Reset hysteresis depending on the effort, between 50
and 200 kg.
Safety feature should be managed by one of the NC
contacts of the load limiter; in this way, an overload
situation will be detected when the contacts open.
Applying this condition will also ensure a positive
safety function for the lifting machine in the event of
an accidental interruption of the link between the load
limiter and the control circuit.
The NO contacts are intended for management of slack
cable situations and/or situations where the operator
warning system has been triggered subsequent to
cross-over of one of the thresholds.
4.4. Connection diagram
See figure 4.
5. Threshold adjustment
In the example given below, we have arbitrarily
designated threshold S1 as the safety threshold and
threshold S2 as the complementary threshold. Since the
micro switches have the same characteristics, these
configurations can be inverted.
The adjustment process should always be preceded by
a preload at 110% of the desired threshold.
5.1. Factory preset load limiters
When you purchase a load limiter dynasafe
with the factor preset option, the load limiter is supplied
with the adjustment screws and locknuts locked with
red varnish. The nameplate on the load limiter indicates
the threshold setting value and the wire rope diameter
for which the thresholds have been adjusted.
5.2. Adjustment of a safety threshold
Preliminary conditions:
– Load limiter correctly mounted and wired.
– Adjustment screws unscrewed to the maximum.
– Hook free of any load.
Equipment required:
– A load (called «WLL») equivalent to 100% of the
nominal capacity authorized for the lifting machine.
– An additional load equivalent to 10% of the WLL.
GB
Mecha 3.2
TM
9
Advertenties
Hoofdstukken
Inhoudsopgave
