Operation In Hazardous Areas Of Zone 22 - Siemens SIMOTICS FD 1MQ1 Operating And Installation Instructions

especially in an explosive atmosphere can ignite surrounding dust or combustible gases.
Explosions can occur. There is also a risk of an electric shock. Death, serious injury, or material
damage will result.
● Do not open the bridging of the bearing insulation during operation.
Explosion hazard due to overheating of the machine caused by a layer of dust
Deposits of dust have a thermal insulation effect, which can lead to the machine overheating.
The maximum surface temperature of the machine cannot be adhered to. The dust can ignite,
resulting in an explosion. This can result in death, serious injury or material damage.
● Dust the machine regularly.
● Do not allow dust layers thicker than 5 mm to build up on the machine surface.
● Do not switch the machine on until the dust has been removed.
Risk of explosion due to excessive bearing temperature
The surface temperature cannot be maintained within maximum permissible limits if the
bearing becomes too hot. The dust can ignite, resulting in an explosion. This can result in death,
serious injury or material damage.
● Monitor the bearing temperature (Page 98).
● In addition to the current-dependent overload protection device located in the three phases
8.2

Operation in hazardous areas of Zone 22

Safe handling
In addition to the danger notices in the previous section, the following also applies:
Electrical systems in hazardous areas must be assembled, installed, and operated in
accordance with the applicable rules and regulations. It is assumed that system operators can
ensure that these rules and regulations are observed during assembly, installation, and
operation, and that the appropriate tests are carried out. We recommend that these tests be
carried out and documented in coordination with the authorities responsible.
SIMOTICS FD 1MQ1
Operating Instructions 01/2019
of the connecting cable, we recommend that you also monitor the temperature rise in the
machine using temperature sensors integrated in the stator winding (Page 98).
8.2 Operation in hazardous areas of Zone 22
Operation
111