Temperature Monitoring And Thermal Motor Protection; Temperature Monitoring Circuits Temp-S And Temp-F - Siemens SIMOTICS L-1FN3 Configuration Manual

4.1.2

Temperature monitoring and thermal motor protection

4.1.2.1

Temperature monitoring circuits Temp-S and Temp-F

The primary sections are equipped with two subsequently described temperature monitoring
circuits – Temp-S and Temp-F.
● Temp-S activates the thermal motor protection when the motor windings are thermally
overloaded. In this case the precondition is that Temp-S is correctly connected and
evaluated. For a thermal overload, the drive system must bring the motor into a
no-current condition.
● Temp-F is used for temperature monitoring and diagnostics during commissioning and in
operation.
Both temperature monitoring circuits are independent of one another.
For example, the SME12x Sensor Module or the TM120 Terminal Module evaluates the
temperature sensor signals.
You can obtain commissioning information from Technical Support. Contact data is provided
in the introduction.
Temp-S
To protect the motor winding against thermal overload, all primary sections are equipped
with the following temperature monitoring circuit:
● 1 x PTC 120 °C temperature sensor per phase winding U, V, and W, switching threshold
at 120 °C
The three PTC temperature sensors of this temperature monitoring circuit are connected in
series to create a PTC triplet.
Figure 4-2
Every phase winding is monitored so that also uneven currents – and therefore the
associated different thermal loads of the individual phase windings – are detected. Different
thermal loads of the individual phase windings also occur during the subsequent motion or
operating states while the motor is simultaneously generating a force:
● Zero velocity (holding)
● Very slow travel (velocity < 0.5 m/min)
● Oscillation (stroke < 1 pole pitch)
1FN3 linear motors
Configuration Manual, 10/2018, 6SN1197-0AB86-0BP2
PTC triplet
Motor components and options
4.1 Motor components
85