Donati DRH 1 Series Instructions For Use Manual Download

Page: 96 / 130

MAN16MG05

instructions

for

use

series

drh

1/2/3/4 -

dst

drt

• To carry out the internal check of the control apparatus, remove the screws

-1-

from the cover

-2-

Disactivate

the motor fuses (fig. 142A). Remove the screws

-3-

which fix the panel

-4-

and take off the panel itself to allow

access to the contactors located on the back (fig. 142B)

• Operating with the push-button panel, check that the moving parts of the contactors move with minimum

friction; otherwise the force of the electromagnet could be insufficient to ensure good pressure between the

contacts

• Check, to avoid uncertain contacts, heating or noises, that the current to the coils is of the correct value
• Check the efficiency of the conductors and the earthing connections, including the screws of the earth clamps,

and if necessary fix them

• Check that the clamps are tightened well; check that the identification number is clearly visible and integral to

the clamp; check the thermoinsulating material is intact and if there are cracks or breaking replace it immediately

• Prepare a regular stock of each type of fuse installed (see electrical circuit diagram), so as to replace a fuse

rapidly when necessary

• Check all the holding gaskets of the covers and cable clamps
• Check that there is clear labelling on the cover.

• Check the state of conservation of the push-button panel, the functionality and efficiency of all the buttons, clean

them and remove any sludge from the button casing. Check that labelling is legible. Check the holding gaskets.

• Check the state of conservation of the multipolar cable of the push-button panel and of all the flexible cables

checking there are no cuts, abrasions, peeling and uncovered conductors. Ascertain the efficiency of the weak
suspension ties of the push-button panel and of their correct fixing to the hoist body.

Monthly checking of the push-button panel and related cable

Quarterly checking of the efficiency of the electrical control system

(fig. 142):

(in the case of the hoist and related trolley with incorporated BT control panel)

WARNING! Some of the operations described below are carried out with live power,

operate with the maximum caution.

• Do non hesitate to replace the electrical component, if it is no longer giving sufficient

guarantee of functional reliability

• Never carry out improvised repairs

• use original spare parts

Where there is breaking of the push-button panel, cuts and peeling of the cable, inform

the electric maintenance officer for replacement.

fig. 142a

fig. 142b

fig. 142

instructions

for

use

series

drh

1/2/3/4 -

dst

drt

MAN16MG05

The hoist is fitted with an overload device control at an intervention threshold.

• The device is made up of an electromechanical lever-operated system, precalibrated pivots and springs which

measure the deformations due to overload and act on the contact of micro switches, which open the power
circuit of the coils of the control contactors of the electrical equipment.

• The intervention of the device signals the reaching of the maximum load limit admissible and if fitted with B.T.

incorporated, stops all the functions (lifting and travelling) except that of descent.

• Check the correct intervention by checking that its functioning intervenes with a load between 120% and

125% of the nominal load.

• Repeat the operation several times checking the repetitivity of the release values.
• Check the mechanical integrity and the cleanliness of the mobile elements (lever and pivots) and check the

correct tightening of the split pins and of the fixing screws of the micro switch.

Quarterly checking of the efficiency of the overload device

(fig. 143):

• The overload devices are controls which perform safety functions and their breakdown

or malfunctioning can seriously threaten the safety of people exposed to them!

• The checking of the calibration value of the release limit of the intervention threshold

of the overload device must be carried out, as prescribed by regulation FEM 9.761,

at least once a year using known value weights duly preset and/or with the help of

a charge cell with visualisation of the stress values

• Note in the checks register the values found following the annual calibration checks

of the overload device.

• Do not tamper with or disconnect the overload device, or modify the preset calibration