Temperature Monitoring And Thermal Motor Protection; Temperature Monitoring Circuits Temp-S And Temp-F - Siemens Simotics T-1FW6 Operating Instructions Manual

2.5.4

Temperature monitoring and thermal motor protection

2.5.4.1

Temperature monitoring circuits Temp-S and Temp-F

The motors are equipped with the two temperature monitoring circuits – Temp-S and Temp-F
– that are described below.
• 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
All motors are equipped with the following temperature monitoring circuit to protect the motor
winding against thermal overload:
• 2 x PTC 130 °C temperature sensor per phase winding U, V, and W, response threshold
at 130 °C, one of which is reserve
The three PTC temperature sensors (PTC thermistor temperature sensors) of this
temperature monitoring circuit are connected in series with a PTC triplet.
Figure 2-6
To protect the power connection at the enclosure against thermal overload, an additional
PTC 80 °C is connected in series with the PTC 130 °C 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
1FW6 external rotor built-in torque motors
Operating Instructions, 12/2020, A5E49196960B AB
PTC triplet
Description
2.5 Design
43