WEGeuro – Indústria Eléctrica S.A.
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5.10 Unused cable entries of main terminal box, auxiliary terminal box and bearing
thermal protections,
must be closed with ATEX / IECEx certified threaded
plugs
with the same protection (Ex d IIB, Ex d IIC, Ex e II, Ex d I or Ex e I) of
the terminal boxes.
5.11 Motors with flying leads must be connected out of hazardous area or with an
approved protection way or system.
5.12 Motors fitted with angular contact ball bearings should not be allowed to run at
no load and must be used in the mounting form IM engraved on the nameplate.
(see
IM
in the nameplate).
5.13 Motors with sleeve bearings (not foreseen for IIC group) must be directly
coupled to the driven machine. The pulley/belt drive system is not
recommended for this type of motor.
When the motor is coupled to the driven machine take care to the axial float of
the motor sleeve bearing, of driven machine as well as the maximum axial
tolerance of the coupling.
This type of motors are not allowed in any circumstances to work with axial
thrusts on the sleeve bearings as they are not designed to support this kind of
loads.
6. MOTOR PROTECTIONS
6.1
We recommend motor protection by using overloads and short-circuit relays.
6.2
Motors must be earthed, using either the earting screw inside the terminal box
or fixed to the motor frame.
6.3
If motors are fitted with thermal protections,
they must be connected
in order
to guarantee that maximum allowable surface temperature of the motor is not
exceeded.
In case of Pt100 or thermocouples, tripping temperature must be regulated to
the values indicated by WEGeuro.
Particularly motors supplied via Variable Speed Drive must be fitted with
thermal sensors on windings and, eventually, on one of the bearings. The
connections of these thermal protections
are compulsory
. These motors are
equipped with flameproof terminal boxes Ex d only.
On 2 speed motors both windings shall be individually protected.
6.4
If anti-condensation heaters are fitted, they can not be connected unless the
motor is switched off and cold.
6.5
In the case of motors with forced ventilation or without a fan working in an air
flow, a device must avoid motor running without ventilation.
