3 ATEX Explosion hazard areas
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3.3.12 Maintenance
The voltage must always be switched off and secured against being switched on again before
opening the motor!
Notice! Higher temperatures than the maximum permitted surface temperature of the housing
may be present inside the motor. The motor must therefore never be opened in hazardous dust
atmospheres! The motors must be checked and tested regularly for functional safety! The
applicable national standards and regulations must be complied with!
Impermissibly thick dust deposits > 5 mm must not be allowed to build up! If functional safety cannot be
ensured, the motor may not be operated! When the ball bearings are replaced, the rotary shaft seals
must also be replaced. FKM rotary shaft seals as specified by Getriebebau NORD must be used. Ensure
that they are fitted correctly! The rotary shaft seals must be lubricated on the external rings and on the
seal lips. If an explosion protected gear is flanged dust-tight to the motor, an NBR rotary shaft seal can
be used on the drive side of the motor if the gear oil temperature does not exceed 85°C. Only original
parts may be used as spare parts with the exception of standardised, commercially available and
equivalent parts. This particularly applies to seals and connection components. Parts for terminal boxes
or spare parts for external grounding must be ordered as per the spare parts list in the operating
instructions.
The functionality of seals, rotary shaft seals and cable glands must be regularly checked!
Maintaining dust protection for the motors is of paramount importance for explosion protection.
Maintenance must be carried out by qualified personnel in a specialist workshop with appropriate
equipment. We urgently recommend that the general overhaul is carried out by NORD Service.
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