NORD Drivesystems B1091 - Manual (Page 11)

www.nord.com B1091-GB-4613 -11-
6. Motors for use in
Zone 21 and Zone 22
6.1 General information
The following information applies additionally or particularly for category 2D and 3D motors!
According to their labelling, the motors are suitable for use in Zone 21 (category 2D) or Zone 22 – non-conduc-
tive dusts (category 3D) .
Type suffix: Zone 21:
2D e.g.: 80 L/4 2D TF
Zone 22: 3D e.g.: 80 L/4 3D TF
The labelling is as follows:
0102
II 2 D T 125°C for category 2 (Zone 21)*
Certification number: BVS 04 ATEX E 037
II 3 D T 125°C for category 3 (Zone 22 non-conductive dust)*
* the details of the surface temperature may deviate from 125°C and may be obtained from the type plate
If the motor is attached to a gear unit, the EX labelling of the gear unit must also be observed!
6.2 Safety information
The increased danger in areas with combustible dust requires that the general safety and commissioning
instructions are strictly complied with. Explosive concentrations of dust may cause explosions if ignited by
hot or sparking objects. Such explosions may cause serious or fatal injuries to persons or severe material
damage.
It is absolutely essential that the persons responsible for the use these motors and frequency inverters in
explosion hazard areas are trained in their correct use.
6.3 Commissioning information / Field of application
If the motors are intended for inverter operation, this must be specified when ordering. The motors must be
protected against overheating with suitable monitoring equipment! Dust deposits must not exceed 5 mm! The
motors are designed for the voltage and frequency range A in EN 60034 Part 1.
Motors for use in Zone 21 and Zone 22, with labelling TF may be thermally monitored via the built-in PTC
thermistor temperature sensor in combination with a suitable triggering device as the sole protection.
Electrical equipment for use in areas with combustible dust complies with the standards EN 50281-1-1,
EN 60034 and EN 50014. The level of the explosion hazard is determined by the categorisation of the zone.
The operator/employer is responsible for categorisation of the zones (Directive 1999/92/EC).
If the certification is supplemented by an X, the special conditions in the EC type examination certificate must
be complied with. The use of standard motors which are not certified for explosion hazard areas in explosion
hazard areas is prohibited. In Zone 21, the cable glands must be authorised for Ex areas (protection class
minimum IP 66) and must be secured against accidental loosening. Unused apertures must be sealed with
approved plugs (minimum protection class IP 66).
For Zone 22, the cable glands must at least correspond to the protection type specified on the type plate.
Unused openings must be closed with plugs, which at least correspond to the protection class of the motor.
The motor must not be opened in hazardous atmospheres for connection of the electrical cables or for any
other work. The voltage must always be switched off and secured against being switched on again before
opening the motor!