www.nord.com B1091-GB-3212 -17-
7. IE2-ATEX Motors for use in
Zone 21 and Zone 22
7.4 Structure and method of use
The motors are self-cooling. Rotary shaft seals are fitted both on the drive side (DS) and on the ventilation
side (VS). Motors for Zone 21 and Zone 22 have metal fans. Motors with brakes for Zone 22 (Category 3D,
non-conducting dust) have a special plastic fan. The motors are produced as protection class IP55,
optionally protection class IP 66, (Zone 22 – non-conducting dust) or IP66 (Zone 21). Under normal
operating conditions, the surface temperature does not exceed the surface temperature stated on the name
plate.
7.5 Minimum cross section of bonding conductors
Cross-section of phase conductor in in-
stallation S in mm
2
Minimum cross-section of the associated
ground lead S
P
in mm
2
S ≤ 16
16 < S ≤ 35
S > 35
S
16
0.5 S
When connecting a lead to the external ground, the minimum cross-section must be 4 mm
2
.
7.6 Maintenance
The voltage must always be switched off and secured against being switched on again before open-
ing the motor!
Attention! 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 atmos-
pheres! The motors must be checked and tested regularly for functional safety! The applicable na-
tional standards and regulations must be complied with!
Unpermitted high dust deposits > 5 mm may not be allowed to build up! If functional safety cannot be en-
sured, 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 ex-
plosion 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 also applies in
particular 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 implemented by qualified personnel in a specialist workshop with suitable equipment.
We urgently recommend that the general overhaul is carried out by NORD Service.
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