Siemens SIMOTICS T-1FW6 Configuration Manual page 100

Configuration
6.2 Configuring workflow
Intermittent duty S3
With intermittent duty S3, periods of load time Δt
of downtime Δt
down again while at standstill. After a sufficient number of duty cycles with cycle
duration Δt
maximum value T
Figure 6-1
For currents I
In this case, the cycle duration should not be longer than 10 % of the thermal time constant
t . If a longer cycle duration is required, then contact your local sales partner.
TH
Example
When the thermal time constant t
cycle duration:
t
Spiel
Significance of the duty cycle
In addition to the frictional torque, you must also take into account the duty cycle when selecting
the motor. The duty cycle contains information regarding the sequence of motion of the drive
axes and the machining forces that occur in the process.
98
with no current feed. The motor heats up during the load time and then cools
S
= Δt + Δt , the temperature characteristic oscillates between a constant
Spiel B S
and a constant minimum value T
o
Current and temperature characteristic for intermittent duty S3
< I ≤ I , it is not permissible that the rms current exceeds the rated current:
N M MAX
= 0.1 · 180 s = 18 s
with constant current alternate with periods
B
; see figure below.
u
= 180 s, this results in the following maximum permissible
TH
Configuration Manual, 09/2022, A5E52220645B AA
1FW6 Built-in torque motors