KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC
®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
17 of 20
5
Drawn:
08.11.11 Pz/Hk
Replaced for:
KTR-N valid from 08.04.04
Please note protection
mark ISO 16016.
Verified:
09.11.11 Pz
Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in
Hazardous Areas
5.6 Starting
Before putting the coupling into operation, check the tightness of the setscrews in the hubs, the alignment and the
distance dimensions L
HEW1
, L
HEW2
bzw. L
HEW-ZS
and correct, if necessary, and also check all screw connections
regarding the stipulated tightening torques dependent on the type of coupling.
If used in hazardous areas the grub screws to fix the hub as well as all screw connections must be
additionally secured against self-loosening, e. g. glue with Loctite (medium strength).
Last but not least, the coupling protection against unintended contact must be fixed.
The cover must be electrically conductive and be included in the equipotential bonding. Bellhousings (magnesium
part below 7,5 %) made from aluminium and damping rings (NBR) can be used as connecting element between
pump and electric motor. The cover may only be taken off after having stopped the unit.
During operation, please pay attention to
strange running noises
occurring
vibrations.
If the couplings are used in dust explosive areas and in mining the operator must make sure that there is no
accumulation of dust in a critical quantity between the cover and the coupling. The coupling must not operate in
an accumulation of dust.
For covers with unlocked openings on the upper side no light metals may be used if the couplings are used as
appliances of appliance group ll (
if possible, from stainless steel
).
If the couplings are used in mining (appliance group l M2), the cover must not be made from light metal. In
addition, it must be resistant to higher mechanical loads than if it is used as appliance of appliance group ll.
The minimum distance „Sr“ between the protection device and the rotating parts must at least correspond to the
figures mentioned below.
If the protection device is used as cover, regular openings complying with the explosion protection demands can
be made that must not exceed the following dimensions:
Cover [mm]
Openings
Top side
Lateral parts
Distance „Sr“
Circular - max. diameter
4 8
10
Rectangular - max. lateral length
4 8
10
Straight or curved slot -
max. lateral length/height
prohibited 8
20
!
C A U T I O N !
If you note any irregularities with the coupling during operation, the drive unit must be turned
off immediately. The cause of the breakdown must be found out with the table „Breakdowns“
and, if possible, be eliminated according to the proposals. The potential breakdowns
mentioned can be hints only. To find out the cause all operating factors and machine
components must be considered.
Coupling layer:
If coated (priming, painting etc.) couplings are used in hazardous areas, the requirements to
conductability and layer thickness must be considered. In case of paintings up to 200 µm no
electrostatic load can be expected. Multiple coatings exceeding a thickness of 200 µm are
prohibited for explosion group llC.
