Three-phase squirrel cage induction motors in flameproof enclosure type ASA and E2-ASA
frame size 63 – 355
Be aware for adherence to Directive 94/9/EC also for the transmitting
devices. They have to be ATEX certified too.
6.4.1 Flexible coupling
It is the most frequent type of coupling, but special attention should
be paid to accurate alignment of the motor with the driven
equipment
Any failure in correct alignment entails vibrations, noisy functioning,
bearing additional strains and eventually bearings and winding
damaging.
6.4.2 Belt coupling
Only those belts may be used which do not electrostatically charge.
Motor is mounted on slide bars ensuring belt tensioning which may
subsequently be corrected.
Exaggerated belt tensioning leads to high radial loads on bearings
and shaft end while insufficient tensioning leads to belt „stroke” and
the rotor torque transmission is no longer possible.
It
should be observed that for the mounting arrangements IMB6,
IMB7, IMB8, IMV5 and IMV6 the belt tension is only permitted to act
parallel to the mounting surface or towards the mounting surface
and when mounted, both feet (in case of foot-mounting
arrangements) must be secured and supported.
6.4.3 Gear coupling
In this case the shafts of the motor and driven equipment must be
parallel and the tooth gears must function accurately in order to
prevent bearings overloads and premature wear.
Before mounting the coupling, driving pulley or toothed gear a thin
layer of grease will be applied on the motor shaft end ensuring thus
easy mounting of the driving parts.
The transmission elements should be mounted with the press. They
should be pressed up to the shaft end collar.
6.5 Electrical connection
The rules regarding electrical installations in hazardous atmospheres are to
be strictly observed. All mounting and installation works must be performed
by experienced personnel in accordance with EN 60079-14 and local
authority regulations.
