MOZELT GmbH & Co. KG
Load lifting magnet devices
Technical manual:
CoolGen 4
Copyright:
MOZELT GmbH & Co. KG, D-47269 Duisburg
Edition:
August 2014
Rev.:
00
Page 6
English
The generator CG 4 is independent of the on-board
electrical system, and produces its own supply voltage for
internal control and monitoring. The machine is overload
and short-circuit proof.
The correct supply voltage is regulated automatically for
the magnet attached to the generator and the necessary
release time is optimized and implemented for every
kind of material to be loaded.
The operator can read off important operating conditions
from the function display (MFD) in the operator‘s cab.
The display of the relative duty rating in % (ED) is to be
observed for the range 50% to 100% of the attached
load lifting magnet. If this exceeds the value 80% ED, the
danger of the magnet overheating is signalized by a red
LED.
It is then recommended to change the work mode or to
take a break to allow the magnet to cool down.
The localization of work related errors in the 230 V cable
system is directly possible. Cable damage and
shortcircuits in the 230 V cable system lead to immediate
disconnection of the supply voltage (passive protection
for individuals).
1.5
Protection Concept, Behaviour in the Case of
Faults
The intrinsic safety of the power generator is enhanced
by an extension of the monitoring functions, Installed
monitors ensure a high operational reliability of the
system.
In case of fault, the electronics is immediately blocked. At
the same time, a fault is indicated and the LED „Ready for
operation“ extinguishes.
The following monitoring functions are integrated:
•
Overload protection
•
Insulation monitoring
•
Overtemperature protection
•
Overspeed protection
•
Open magnetic circuit
•
Short circuit
1.6
Safety regulations magnet operation
The operation of a load lifting magnet on a mobile
excavator represents a special mode of operation and
an increased safety risk. In contrast to working with
a hydraulic grabber, the magnet picks up all available
ferromagnetic material immediately after it is switched
on.
This may even be more than the load-carrying capacity of
the mobile excavator allows.
Similarly, the magnet suddenly releases the lifted
material after it is switched off, if there is cable damage
or a short-circuit in the magnet feed cable. This can
lead to dangerous situations in the working vicinity, for
example, if falling material causes other objects to be
hurled up by lever force. Furthermore, it is not excluded
that pieces of scrap iron may separate from the magnet
during a swiveling procedure, if these are located at the
lower end of the lifted material cluster.
For these reasons, it is particularly important to observe
the following principle:
WARNING
WARNING
The magnet can oscillate strongly after load release!
For this reason, the mechanically safe attachment of
the magnet in the form of a special magnet suspension
at the end of the arm on the mobile excavator is highly
recommended!
Do not swivel the working equipment
or change the location of the
excavator with the magnets
switched on without a
payload - unintentionally
lifted materials can lead to
human injury by lever force!
While working with the load
lifting magnet it is forbidden to
stand within the extended reach of
the excavator
