Nord Drivesystems B1091, Operating Manual With Installation Instructions

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3 ATEX Explosion hazard areas
B 1091 en-1221 41
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3.3.9 Further operating conditions
If nothing is stated to the contrary regarding operating mode and tolerances, electrical machines are
designed for continuous operation and normal infrequent starts, where there is no significant start-up
warming. The motors must only be used for the operating mode indicated on the rating plate.
The installation regulations must be observed!
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3.3.10 Design and operating principle
The motors are self-cooled. Radial shaft seals are used on the drive side (AS) as well as on the
ventilation side (BS). Motors for Zones 21 and 22 have a metal fan. Motors with brakes intended for
Zone 22 (Category 3D, non-conducting dust) have a special plastic fan. The motors have been
designed with protection class IP55, optionally with protection class IP66 (Zone 22 - non-conducting
dust, EPL Dc) or IP66 (Zone 21, EPL Db). The surface temperature does not exceed the surface
temperature indicated on the name plate. The prerequisite is the consideration of the operating
instructions.
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3.3.11 Minimum cross section of bonding conductors
Cross section of the phase conductor
of the installation S [mm
2
]
Minimum cross section of the associated
protective conductor S
P
[mm
2
]
S ≤ 16
S
16 < S ≤ 35
16
S > 35 0.5 S