NORD Drivesystems B1091 - Manual (Page 13)

www.nord.com B1091-GB-4613 -13-
6. Motors for use in
Zone 21 and Zone 22
6.6 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 dust explosion hazard
atmospheres! The motors must be regularly checked and tested 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 may 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 also
applies in particular to seals and connection components. Parts for terminal boxes or spare parts for external
earthing must be ordered according to the spare parts list in the operating instructions.
The functionality of seals, rotary shaft seals and cable glands must be regularly checked!
Maintenance of dust protection for the motors is of paramount importance for explosion protection..
Maintenance must be performed by qualified personnel in a specialist workshop with suitable equipment.
We urgently recommend that the general overhaul is carried out by NORD Service.