EN
Maintenance - Motor
• The electric connections must be correctly locked to avoid resistance-increases, with consequent contact
overheating.
• The insulation air-distance and the surface-distance between conductors, required by the standards, must be
respected.
• All the screws, used to assemble the parts of the motors and of the terminal box, must be completely
tightened.
• The replacement of seals and of components for cable entrance would be made using spare parts, supplied
from the manufacturer, in order to guarantee the original type of protection.
• The Ex joint surfaces have not to be machined and it is not allowed to insert, between them, any kind of seals,
not foreseen or supplied from the manufacturer.
• The join surfaces have just to be cleaned and, in order to avoid corrosion or water entrance.
When it is not possible to make the repairs of Ex motors at the manufacturer’s plant, the outside workshops,
deputed to this task, must be endowed by the necessary capability, including:
• Sufficient technical knowledge of these motors.
• Factory equipment with tooling and facilities, suitable to make repairs.
• Quality control department, for the checks and the tests, requested after repairs.
• For the Ex motors the repairs of parts, directly involved on the protection against the explosion risk, must be
done without any modification to the original motor design.
Repair procedures of the Ex motors - are reported by IEC 79-19 standard.
WARNING
Electric Motors
Wait until the unit has cooled sufficiently after stopping and isolation.
Maintenance of Ex Motors - are reported by EN 60079-17 standard, in particular:-
77-3226 R5.1
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