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MAN16MG05

instructions

for

use

series

drh

1/2/3/4 -

dst

drt

5.2.6 Manoeuvres

It is a good rule to perform one movement at a time, because only in this way can a manoeuvre be started, stopped

and constantly followed by the operator, who also has to avoid continuously switching the machine on and off
even for little movements.

• Engagement of the load by the hook of the hoist and by the lifting accessories must be carried out with great care,

delicately and without jolting.

• Begin a lifting operation by slowly stretching the ropes until the load has been lifted by a few centimetres, stop the

manoeuvre and check the hold and stability of the load.

• At the end of the manoeuvre, place the load on the ground carefully and remove the hook of the hoist.

5.2.7 Lifting

The operator must take care to always keep the lifting ropes stretched and never to let the hook rest on either the
ground or the loads to be lifted. The lose ropes can become twisted, come out of the windings of the drum or out
of the pulleys of the hook block, form knots, become even severely damaged and create sudden dangerous
situations. The operator must absolutely avoid carrying out oblique pulls, which are always dangerous and difficult
to control especially oblique pulls parallel to the axis of the drums. They can cause damage to the rope guide and
slots of the drum resulting in irregular winding (fig.110).

5.2.8 The trolley translation

The travel limit switches are usually located near the end of the beam so as to maximise the travel of the trolley.
Therefore, avoid, especially near the end of the beam, repeated short impulse translation manoeuvres and sudden
changes of direction which, as well as causing damage to the mechanical organs, can also cause the load to swing
dangerously with risks of hitting or violent collision between the trolley and the mechanical stops at the end of the
beam (fig. 111).

• Operate with care and diligence, follow the manoeuvre constantly and visually check the balance of

the mass being moved.

• Avoid sharp or jolting movements which are very damaging to the stability of the load because of

the dynamic effects which are generated.

• Never lift loads with an unbalanced and non barycentric engagement. Never neglect to hook the load

and secure all original sling accessories. Do not secure the load with improvised slinging.

Check the efficiency of the ropes and hooks periodically.

drhmon115

fig. 110

fig. 111

instructions

for

use

series

drh

1/2/3/4 -

dst

drt

MAN16MG05

5.2.9 Safety devices

Cutting out the power supply of the DRH rope hoist and relative trolley must be done by switching off the line

switch/selector and/or by pushing the “emergency stop” button on the push-button panel.

An electric and/or mechanical lock prevents simultaneous use of commands for the two directions of the motors for

both high and low speeds.

A lack of voltage causes all movements of the hoist and trolley to be stopped immediately, as the motors are equipped

with an automatic braking device.

A safety latch is installed on the lifting hook to prevent accidental unhooking of the slinging and/or load (fig. 112).

The lifting and transverse limit switches bound the maximum vertical and horizontal travel of the hook. They are

emergency devices and are not suitable for turning off the machine or to begin new operations.

The overload device, prevents the use of hoist overload because, when its calibration values are exceeded, the control

circuit of the micro switch of the device provides an electrical signal, in order to stop the dangerous movements. The

calibration of overload device installed on DRH wire rope hoists, is within values corresponding to the rated capacity

plus the following percentages: min. 20% and max. 25%.

1. Visually check the integrity of the DRH rope hoist, trolley and other structures if installed. Pay particular

attention to the rope, hook and related safety latch.

2. Carry out all preliminary checks as described in paragraph 5.5 “Criteria and precautions of use”
3. Turn on the power supply by putting the main switch in the “ON” or “1” position
4. Ensure that no people are exposed in danger zones
5. Place the red mushroom-shaped “emergency stop” button in the position which allows movement (fig. 113)
6. Activate all functions by pushing, if available, the “forward” button, and at the beginning of manoeuvres use the

“alarm”

button, if available, which activates an acoustic signal.

7. Verify proper functioning of the safety devices by checking the movements as described in paragraph 5.1

“Functions of the hoist”.

fig. 112

fig. 113

• When the safety devices are not supplied by DONATI SOLLEVAMENTI S.r.l., they must

be installed by the purchaser.

• use of the hoist and/or application of the CE mark, shown here on the right, is

forbidden before the hoist has been completed according to the specifications detailed

in this point.

5.3