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MAN16MG05
instructions
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• The overload device of the DRH wire rope hoist has been duly registered and calibrated by
dONATI
SOLLEVAMENTI S.r.l.
considering the
lifting capacity and the FEM service group foreseen for the hoist.
Following the test run , the micrometric adjusting screw for the calibrations
-1-
is blocked with the grub screw
-2-
and subjected to tamperproof sealing (fig. 100).
• The overload device is a component with the safety function of
preventing overload
and the calibrations
MUST
NOT
be changed (fig. 101).
• Where a new calibration is necessary, such an operation
MUST BE
performed by the technical service of
dONATI
SOLLEVAMENTI S.r.l.
or by staff trained and authorized by the company.
Having done the functional ”empty” test runs, proceed to the dynamic test runs; these test runs are carried out with
weights of value corresponding to the lifting capacity of the label plate of the hoist increased by the coefficient of
overload 1.1 (load equal to 110% of the nominal load). The static test runs are done with a coefficient of overload
of 1.25 (load equal to 125% of the nominal load).
4.5.4 Testing the hoist - Suitability of use
Calibration of the overload device:
DONATI TECHNICIAN
DONATI SERVICE
• The overload device MuST be connected to the control board according to the
instructions detailed in the related electrical circuit diagrams.
• The overload device MuST NOT be tampered with and the calibrations MuST NOT be
modified.
• The DRH electric wire rope hoists and related trolleys have been tested by the manufacturer to
ascertain their functional and performance response. However such testing must be repeated after
installation in order to ensure the optimal, safe functional performance of the hoist and trolley in
their place of installation.
• The testing phases require a precise sequence of operations which, described as follows must be
strictly followed by the technicians in charge.
All tests must be carried out in no windy conditions.
fig. 100
fig. 101
1
2
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instructions
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drh
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MAN16MG05
• Empty test runs:
• activate the switch/disconnecting switch
• put the emergency stop switch in the position which allows movement
• press the “gear/alarm” button (if available)
• check the lifting function by pressing the ascent/descent buttons
• check the travelling function by pressing the right/left buttons
• in the case of movements at two speeds check the functionality
• check the functioning of the electrical limit switches of all the movements.
• Dynamic test runs:
• prepare adequate weights for the test runs with load equal to
nominal lifting capacity x 1.1
and suitable
equipment for the harnessing and lifting of the load
• harness the load, taking care to position the hook vertically to avoid skew rope falls
• slowly tension the sling so as not to cause tearing, if available do the test runs with load using the “slow” speed
• slowly lift the load and check that this happens with no difficulty and that there are no anomalous noises, clear
deformations or sagging in the structure
• repeat the test run at maximum speed, doing the preceding checks
• check the functionality of the “ascent and descent” limit switches
• check the functionality of the lifting brake, checking that the weight is braked in adequate time and that there
is no skidding of the load, after releasing the button.
• carry out the same checks also for the trolley travelling movements, checking the functionality of the “right and
left” limit switches, without bringing the load to the maximum height (lift it to a height of one metre from the
ground).
• operate first at slow speed, if available, and then at maximum speed
• check the correct sliding of the trolley on the girder, and ascertain that there are no noises, evident deformations
or anomalous sagging of the structures.
• check the functioning of the “emergency stop” button which must stop and inhibit all the movements. Any
function of the hoist and/or trolley must stop, in the shortest possible time and space, without showing
anomalies, side skids, dangerous oscillations, etc. which threaten the stability.
• check the braking spaces and stopping spaces during lifting and travelling.
Indicative amplitude of these spaces:
• in the descent movement with maximum load it is between 6 and 8 cm
• in the travelling movement of the trolley, which moves at a speed of 16 or 20 m/min, it is between 15 and
30 cm.
• In both cases consistent oscillations of the load must be avoided.
• Static test run:
•
lift the load used for the dynamic test runs, stop it in suspended position at a height of 50 cm, gradually apply weights
on it until reaching an overload value equal to 25% of the nominal maximum lifting capacity.
• leave the weight suspended for no less than 10 minutes.
•
check that the weight suspended (load + overload) does not yield (the lifting brake must not skid) and that there are
no evident deformations or sagging of the structure.
•
check the functioning of the overload device which must exclude and disactivate all the functions of the hoist and of
the trolley with the exclusion of the descent movement.
During the static test the overload device must disactivate the ascenting movement, the descenting
movement must not be activated.
The testing of the hoist/trolley must be repeated at the annual checks, see point 6.3.4. The results of the
testing must be noted in the checks register, see chapter 8.
Proceed to the testing of the DRH wire rope hoist and, if available, the related trolley, in
the following way:
KMAN16MG05
Содержание DRH 1 Series
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