20
5.52.420.00.01.09
12.5.2
Electronic hoisting power limiter (as option, except serial AT)
Power consumption of the hoist motor is measured during lifting movement of a load
by an adjustable power measuring device (overload guard). The setting is made via a
separate relay for main and creep lifting speed. Power consumption of the motor is
load-dependent and increases with the load. If the set value is exceeded, the relay
responds and switches the motor off via switching elements. After the overload
protection has been activated the LOWER button must be pressed first so that the
LIFT function can be activated again. Before lifting again the load must be reduced to
the nominal load!
Illustration 20
13
Inspection
13.1
General Overhaul for motor-driven units
The validated, national accident prevention regulations must be observed and the measures to reach "safe
working periods (S.W.P.)" according to FEM 9.755.
After the "theoretical working time D" has been elapsed, the owner/user must take motor driven devices out
of operation and effect a General Overhaul.
Further use of the equipment is only allowed after a licensed qualified person has proofed
that further use is possible without doubt
and
the conditions for further use have been determined
These conditions have to be written down in the test book.
The owner/user is responsible to make sure that these conditions are observed.
13.2
Periodic checks
Independently from the regulations of the individual countries, lifting devices must be checked at least yearly
by a qualified person or licensed qualified person regarding its functional safety.
13.2.1
Components to be checked
The following must be checked:
Dimensions of load chain, load hooks, pawls, bolts, ratchet wheels, brake linings.
The dimensions must be compared to the dimensions in the tables.
A visual inspection for deformations, cracks and corrosion must be carried out.
13.2.2
Inspection intervals
at
commissioning
daily
checks
1st maintenance
after
3 months
Inspection
and
maintenance
every
3 months
Inspection
and
maintenance
every
12 months
Inspection
and
maintenance
every
36/60 months
Inspection of the equipment by
a qualified person
(periodic inspection)
X
screw connections
X
X
brake function - brake discs
X
X
overload protection as slipping clutch
(if relevant)
X
X
overload protection by current cut-off (electric hoist) (if relevant)
X
X
overload protection by air relieve valve
(pneumatic hoist) (if relevant)
X
X
load chain, clean and oil
X
X*)
X
X
load chain, elongation and wear
X
load hook, cracks and deformation
X
Bearings of chain pulleys,
check and lubricate
X
Hoist gear, oil change
X*)
Trolley wheels, wear
X
Trolley wheels, lubricate toothed wheels
X*)
X*)
X*)
*) see chapter "maintenance"
