Natural Frequency When Mounted - Siemens SIMOTICS T-1FW3 Configuration Manual

The actual adjustment status of an absolute encoder is shown in the following machine data:
For SINUMERIK
MD34210 §MA_ENC_REFP_STATE (absolute
encoder status)
● Adjust the encoder as described in the instructions in the associated Function Manual.
The motor is now ready for operation again.
❒
For detailed information about replacing an encoder, see Chapter "Maintenance and service
intervals (Page 72)".
5.4.8

Natural frequency when mounted

The motor is an oscillating system with a design-dependent natural frequency, which is
higher than the specified maximum speed.
When the motor is mounted onto a machine, a new system, which is capable of vibration, is
created with modified natural frequencies. These can lie within the motor speed range.
This can result in undesirable vibrations in the mechanical drive transmission.
Note
Motors must be carefully mounted on adequately stiff foundations or bedplates. Additional
elasticities of the foundation/bedplates can cause resonance effects of the natural frequency
at the operating speed and, therefore, result in inadmissibly high vibration values.
The magnitude of the natural frequency when the motor is mounted depends on various
factors and can be influenced by the following points:
● Mechanical transmission elements (gearboxes, belts, couplings, pinions, etc.)
● Stiffness of the machine design to which the motor is mounted
● Stiffness of the motor in the area around the foot or customer flange
● Motor weight
● Machine weight and the weight of the mechanical system in the vicinity of the motor
● Damping properties of the motor and the driven machine
● Installation type/position (IM B14, IM V18/19, IM B35)
● Motor weight distribution, i.e. length, shaft height
1FW3 complete torque motors
Configuration Manual, 08/2020, A5E46027705B AA
For SINAMICS
p2507 (absolute encoder adjustment status)
Configuration
5.4 Mounting
145