Siemens SIMOTICS T-1FW68, Configuration Manual

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Motor components and options
4.1 Motor components
1FW68 radial segment motors
Configuration Manual, 08/2021, A5E51132930B AA
71
4.1.2 Temperature monitoring and thermal motor protection
4.1.2.1 Temperature monitoring circuits Temp-S and Temp-F
The stator segments 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.
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 stator segments are equipped
with the following temperature monitoring circuit:
• 1 x PTC 130 ° C temperature sensor per phase winding U, V and W, i.e. response
threshold at 130 ° C
The three PTC temperature sensors of this temperature monitoring circuit are connected
in series to create a PTC triplet.
Figure 4-4 PTC triplet
Every phase winding is monitored so that also uneven currents - and therefore the
associated different thermal loads of the individual phase windings - are detected. For
the following motion and/or operating states, the individual phase windings have
different thermal loads, while the motor simultaneously outputs a torque:
• At standstill (holding)
• When rotating very slowly
• Oscillation through a very small angle