Mounting; Safety Instructions For Mounting - Siemens SIMOTICS T-1FW6 Series Configuration Manual

Periodic duty cycle (S3 mode)
The motor can repeat a drive operation any number of times (e.g. the positioning operation
described above), in which M > M
in which the windings are de-energized between the load phases. Also see Section
"Intermittent duty S3" in Chapter "Specification of the duty cycle."
The "duty cycle" comprises the load phase and the zero-current (cooling) phase. The cooling
phases are crucial here: As a result of the no-load intervals, the effective torque of the duty
cycle is reduced to the value of the rated torque M
If the future duty cycle is either not known or cannot be estimated, the motor can only be
selected on the basis of the required maximum speed and peak torque. This means that for
the duty cycle, the maximum permissible rms torque M
This results in a very short cooling phase, the length of which must not be undershot.
A significantly simplified load cycle comprising three time segments with lengths Δt
is assumed by way of example. In these time segments, torques M
Each of these torques can have any value between + M
M
eff
In this case, the cycle duration (Δt
time constant t
The load cycle is permissible, as long as M
5.4

Mounting

5.4.1

Safety instructions for mounting

Risk of death and crushing as a result of permanent magnet fields
Severe injury and material damage can result if you do not take into consideration the
safety instructions relating to permanent magnet fields.
• Observe the information in Chapter "Danger from strong magnetic fields (Page 32)".
Installing torque motors involves carrying out work in the vicinity of unpacked rotors.
The resulting danger from strong magnetic fields is, therefore, particularly high.
1FW6 High Speed built-in torque motors
Configuration Manual, 01/2020, 6SN1197-0AE03-0BP3
of this load cycle in Nm can be calculated using the following formula:
.
TH
WARNING
intermittently occurs, if there are sufficiently long intervals
N
of the motor.
N
eff
MAX
+ Δt + Δt ) should not be longer than 10% of the thermal
1 2 3
≤ M .
eff N
Configuration
of the duty cycle is also defined.
, M , M are produced.
1 2 3
and – M . The effective torque
MAX
5.4 Mounting
, Δt , Δt
1 2 3
109