NORD Drivesystems B1091 - Manual (Page 15)

www.nord.com B1091-GB-4613 -15-
7. Motors for use in Zone 21 and Zone 22
according to EN 60079-0 and IEC 60079
7.3 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! The thickness of dust deposits must not
exceed 5 mm! The motors are designed for the voltage and frequency range B of EN 60034 Part 1.
Exception: Size 132MA/4 2D, 132MA/4 3D, 132LH/4 2D and 132LH/4 3D motors comply with voltage and
frequency range A.
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 inflammable dust comply with the standards DIN EN 60079-0, IEC
60079-0, EN 60079-31, IEC 60079-31, as well as DIN EN 60034 and IEC 60034.
The valid version of the standard can be obtained from the EC Declaration of Conformity or the IECEx CoC.
The degree of explosion hazard determines the zone categorisation. The operator / employer is responsible
for the assignment of zones (in Europe: RL 1999/92/EC)
If the certification is supplemented with an "X" the special conditions in the EC prototype certification, the
IECEX CoC and/or the relevant documentation must be observed. The use of standard motors which are not
certified for explosion hazard areas in explosion hazard areas is prohibited.
The terminal box cover seal must be captively fastened to the terminal box cover. Please only use an original
seal when replacing the seal.
If the terminal box is opened during installation, maintenance, repair, troubleshooting or overhaul, the
terminal box cover must be re-fitted after the work is complete. There must be no dirt on the surface of the
seal or the sealing surface of the terminal box frame.
The screws for the terminal box cover must be tightened with a torque according to the following table.
Tightening torques for terminal box cover screws
Thread Tightening torque [Nm]
M4 0.8 to 1.2
M5 1.2 to 1.8
M6 1.5 to 2.5
M8 3.0 to 5.0