WEGeuro - Indústria Eléctrica, S.A. Português - English
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7.7 Motors fed by variable Speed Drive must be fitted with thermal sensors on windings
and, eventually, on the bearings. The connections of these thermal protections are
compulsory. These motors are equipped with flameproof terminal boxes “Ex db” only.
On 2 speed motors both windings shall be individually protected.
7.8 If anti-condensation heaters are fitted, they can’t be connected unless the motor is
switched off and cold.
7.9 In the case of motors with forced ventilation, a device must avoid motor running
without ventilation.
To avoid that maximum allowed surface temperature is exceeded, thermal protectors
of main and auxiliary motors must be connected to suitable protection devices and, if
protectors are Pt100 or thermocouples, trip temperatures must be regulated to the
values indicated by WEG.
8. MAINTENANCE
8.1 For explosion-proof motors or motors protected by enclosure, only open the terminal
box and/or disassemble the motor when the surface temperature of the enclosure is at
the ambient temperature.
8.2 The type, quantities of grease and the respective lubrication intervals for normal
working conditions are shown on the nameplate. The addition of grease shall be
carried out with the motor running and in compliance with safety procedures.
For heavy working conditions such as humidity and high levels of pollution, important
bearing loads or excessive vibration levels, it is recommended to reduce the
lubrication intervals.
8.3 Every two years the motors should be opened and the bearings should be checked,
and replaced, if necessary. During this inspection remove the old grease from the
grease outlet.
8.4 The air inlets and the cooling surfaces shall be cleaned periodically. The intervals
depend on the degree of pollution/accumulation of dust in the air.
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