P
RODUCT INFORMATION
impact sparks.
Earthing
Electrostatic ignition hazards can be
avoided by means of safe earthing. In zones 1
and 21, it is required to earth the hoists. This must
be achieved via load hooks or load eyes if the lift-
ing equipment is connected to correspondingly
earthed parts (earth leakage resistance with less
than
10
6
Ω
) This also applies for the operation of
trolleys or cranes. Their tracks must be earthed
on site. Generally, running wheels and rail sur-
faces may not be painted with lacquer coats, as
this can result in unacceptably high earth leakage
resistance values. Earthing of the load hook takes
place via the chain. Loads must be earthed during
transportation. A separate earthing is required, for
example when using non-conductive sling gear.
Cleaning plastic surfaces
DANGER
Danger of explosion
Electrostatic charging may occur at the plastic
surfaces due to mechanical friction, potentially
leading to brushing discharges that can ignite
gases and air mixtures.
I
Only clean surfaces with a damp cloth (cleaning
cloth with water).
If your product has plastic components, their sur-
faces may only be cleaned with a damp cloth
(cleaning cloth with water). This reduces the elec-
trostatic charging that can result from the mechan-
ical friction on the plastic surface.
Acetylene and copper
When operating JDN
products in potentially explosive areas where
acetylene-containing atmospheres can occur, it
must be ensured that copper-plated parts and
parts made of materials with a copper content
>
70%
are kept dry in order to eliminate the pos-
sibility of oxidation of the metallic copper and the
formation of an aqueous phase that is capable of
reacting with acetylene, which could lead to a dan-
ger of explosion.
Emergency lowering
DANGER
Risk of explosion
There is an increased danger of explosion during
emergency lowering. Heat is generated in the en-
gine that cannot be sufficiently dissipated due to
the lack of compressed air supply (see “General
information on explosion protection”).
I
Check for a potentially explosive atmosphere
before and during emergency lowering at the site
of operation.
I
After emergency lowering, the site of operation
must still be checked for a potentially explosive
atmosphere or it must be ensured that the maxi-
mum surface temperature is below the specified
limit values of the respective temperature class.
I
If necessary, stop the process or ensure suffi-
cient monitoring.
I
Continuous use of the emergency lowering
device with an only partially ventilated brake (re-
duced manual force) is to be avoided.
The emergency lowering device is constructed in a
similar way to the emergency brake in accordance
with DIN EN ISO 80079-37, Section 5.11: If this
device is less likely to be used, no further protec-
tive measures are necessary for devices in device
category 2 (devices for use in zone 1/21).
In relation to the built-in emergency lowering de-
vice, this means that
1. the latter may only be used in the emergency
described in the section “Description of the
emergency lowering device” and the hoist
must always have a stable compressed air
supply with a low probability of failure.
2. when using this device, the maximum surface
temperature of the engine can be above the
maximum permissible surface temperature of
the specified temperature class.
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Doc.-No.: VA058498-50-OM-EN-1021-62-2
