EN
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WARNING
Wait until the unit has cooled sufficiently after stopping and isolation.
Motor
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Maintenance
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.
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.
Repair procedures of the Ex motors - are reported by IEC 79-19 standard.
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.
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.
Maintenance of Ex Motors - are reported by EN 60079-17 standard, in particular:-
Electric Motors
The electric connections must be correctly locked to avoid resistance-increases, with consequent contact
overheating.
Factory equipment with tooling and facilities, suitable to make repairs.
Quality control department, for the checks and the tests, requested after repairs.
77-3229 R4.1
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