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.
● Always check the bearing temperature (Page 86).
● In addition to the current-dependent overload protection device located in the three phases
Operation in hazardous areas
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.
System-specific ignition hazards
The criteria for the respective zonal classification are not harmonized and the assessment of
the operational risks, the local operating conditions and the various monitoring methods is not
uniform. Accordingly, the remedial measures recommended by the supervisory authorities also
differ in some cases, depending on the authority's area of responsibility. The motor
manufacturer cannot provide general recommendations in this regard.
Binding clarification of the on-site risks and of any required measures can only be provided
by the system operator in agreement with the supervisory authority responsible.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
of the connecting cable, we recommend that you also monitor the temperature rise in the
motor with the aid of the temperature sensors built into the stator winding (Page 86).
8.3 Operation in hazardous areas