Siemens 1FW4, Руководство по эксплуатации

Страница: 73 / 116

A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
71
Maintenance
6
6.1 Maintenance
6.1.1 Danger from strong magnetic fields
General
Strong magnetic fields occur with motor components which have permanent magnets, e.g.,
magnetic rotors. In the de-energized state, the magnetic field strength of the motors is solely
attributable to the magnetic fields of the components containing permanent magnets. During
operation, additional electromagnetic fields are generated by the stator current.
Points to note
For 1FW4 motors in the assembled state, the field of the permanent magnets is channeled
through the iron circuit of the motor. Therefore, no harmful magnetic field from the
permanent magnets can be detected outside of the motors.
The rotor may only be removed by the manufacturer or an authorized specialist workshop
due to the hazards posed by magnetic fields. When changing the bearings, you must avoid
passing metallic objects through the rotor field into the motor. Should an on-site bearing
change prove necessary, please contact the Siemens Service Center.
DANGER
Strong magnetic fields can directly affect persons and cause damage.
Observe the national and local regulations of your country! The BGR B11 "Electromagnetic
Fields" must be observed in the Federal Republic of Germany! Observe all requirements!
The handling of components containing permanent magnets is strictly prohibited for all
persons with pacemakers, metallic implants, and foreign bodies that conduct electricity or
magnetism. A medical report is required for any exceptions to this ruling. Establish
unambiguous access rules in accordance with the magnetic fields prevailing in the
workplace. Clearly mark the boundaries of the areas where standing is permitted.
Attraction forces on magnetizable materials
The human body has no mechanism for sensing strong magnetic fields. The average person
generally has no experience with magnetic fields. Therefore, the magnetic forces of
attraction emanating from strong magnetic fields are often underestimated.
The magnetic forces of attraction may be several kN in the vicinity of the motor components
containing permanent magnets (within a distance of less than 100 mm). - That is equivalent,
for example, to crushing your foot with a weight of several 100 kg! These forces only result