Siemens SIMOTICS T-1FW6 Configuration Manual page 38

Description of the motor
3.2 Technical features and ambient conditions
Risk of rotor permanent magnets causing crushing injuries
The forces of attraction of magnetic rotors act on materials that can be magnetized. The forces
of attraction increase significantly close to the rotor. The response threshold of 3 mT for risk of
injury through attraction and causing a projectile effect is reached at a distance of 100 mm
(Directive 2013/35/EU). Rotors and materials that can be magnetized can suddenly slam
together unintentionally. Two rotors can also unintentionally slam together.
There is a significant risk of crushing when you are close to a rotor.
Close to the motor, the magnetic forces of attraction can be up to several kN. – Example:
Magnetic attractive forces are equivalent to a force of 100 kg, which is sufficient to trap a body
part.
• Do not underestimate the strength of the attractive forces, and work very carefully.
• Wear safety gloves.
• The work should be done by at least two people.
• Do not unpack the rotor until immediately before assembly.
• Never unpack several rotors at once.
• Never place the rotors directly next to one another without providing adequate protection.
• Never carry any objects made of magnetizable materials (for example watches, steel or iron
• Immediately install the rotor after it has been unpacked.
• Use a special installation device when centering and assembling the stator and rotor as
• Keep the following tools at hand to release parts of the body (hand, fingers, foot etc.)
First aid in the case of accidents involving permanent magnets
• Stay calm.
• If the machine is energized, press the emergency stop switch and open the main switch if
necessary.
• Administer FIRST AID. Call for further help if required.
36
WARNING
tools) and/or permanent magnets close to the rotor! If tools that can be magnetized are still
required, then hold any tool firmly using both hands. Slowly bring the tool to the rotor.
individual components. Maintain the special procedure.
trapped between two components:
– A hammer (about 3 kg) made of solid, non-magnetizable material
– Two pointed wedges (wedge angle approx. 10° - 15°, minimum height 50 mm) made of
solid, non-magnetizable material (e.g. hard wood)
1FW6 Built-in torque motors
Configuration Manual, 09/2022, A5E52220645B AA