DONATI SOLLEVAMENTI S.r.l. - Via Quasimodo,17 - 20025 Legnano (MI) - Tel. 0331 14811 - E: [email protected]
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3.5 Safety devices and indications
3.5.1 Control devices
•
“DGT” drive units and endcarriages are supplied without command and control
devices, which must be provided by the buyer incorporating these components onto
an industrial lifting or handling system.
•
“DGT” drive units and endcarriges must not be operated before they have been
incorporated, in conformity with indications outlined in Machinery Directive
2006/42/CE, and a “CE Marking” has been affixed, as shown here, on the whole of
the lifting or handling system they are assembled onto.
3.5.2 Safety and emergency devices
“DGT
”
drive units and endcarriages
are equipped with the following devices:
1.
Brakes
(fig. 3): mechanical, negative type,
incorporated in the drive motors (self/braking) for
forward / reverse manoeuvres.
The brakes intervene automatically in case of a
electrical power failure, and are sized to stop the
maximum load the
“DGT
”
drive units and
endcarriages
can
move in total safety and in the
shortest time possible, at the maximum travelling
speed.
fig. 3
2.
Limit switches
(fig. 4)
a)
Electrical
: rotating, shaft-cross type, when included; equipped with sensitive micro-switches which, by
activating the auxiliary circuit, limit the lengthwise stroke of the running beams in forward/reverse
manoeuvres. For
“DGT
”
drive units and endcarriages
with two operating speeds, in addition to the stop
function in both directions, electrical limit strokes also ensure a pre-slowdown function, switching from “high”
speed to “low” speed;
b)
Mechanical
: provided as standard equipment, comprising shock absorbing buffers in hard rubber, sized to
absorb forces from kinetic energy generates by the travelling of the bridge crane, in an eventual accidental
strike, i.e. in case the electrical limit strokes fail to work.
Positioning of “DGT” limit strokes 1, 2 and 3:
limit stroke arm fastened by 4 screws
( x )
on the wheel support
Positioning of “DGT” limit strokes 4, 5 and 6:
limit stroke fastened by 2 lower screws
( x )
on the wheel support
fig. 4
•
The electrical limit switches, when included, are not connected!
•
It is obligatory to install and connect the electrical limit switch before setting up and
operating the “DGT” drive units and endcarriages, checking to make certain they intervene
correctly, as outlined at section 4.4 “Setup and Preparation”.
