Type Of Duty Cycle - Siemens SIMOTICS L-1FN3 Configuration Manual

5.2.2

Type of duty cycle

Uninterrupted duty S1
With uninterrupted duty S1, the motor runs permanently with a constant load. The load
period is sufficient to achieve thermal equilibrium.
The rated data is of relevance when dimensioning the motor for uninterrupted duty.
NOTICE
Motor overload
An excessively high load can lead to shutdown, or if the temperature sensors are not
correctly evaluated, then the motor could be destroyed.
• Ensure that the load does not exceed the value I
• Ensure that the temperature sensors are correctly connected and evaluated.
Short-time duty S2
For short-time duty S2 the load duration is so short that the final thermal state is not reached.
The subsequent zero-current break is so long that the motor practically cools down
completely.
NOTICE
Motor overload
An excessively high load can lead to shutdown, or if the temperature sensors are not
correctly evaluated, then the motor could be destroyed.
• Ensure that the load does not exceed the value I
• Ensure that the temperature sensors are correctly connected and evaluated.
The motor may only be operated for a limited time t < t
The time t
with ν = (I
The thermal time constants, the maximum currents and the rated currents of the motors can
be taken from the data sheets.
The above equation is valid under the precondition that the initial temperature of the motor -
the intake temperature of the water cooling T
sheet.
1FN3 linear motors
Configuration Manual, 10/2018, 6SN1197-0AB86-0BP2
can be calculated using the following logarithmic formula:
MAX
/ I ) and thermal time constants t
2
M N
specified in the data sheets!
N
specified in the data sheets!
MAX
with a current I
MAX
.
TH
corresponds to what is specified in the data
VORL
Configuration
5.2 Configuring workflow
< I ≤ I .
N M MAX
109