Thermal motor model 1 for synchronous motors
Further information about thermal motor model 1 for synchronous motors is provided in the
function charts 8016 and 8017 of the List Manual.
8.26 How do I achieve a motor overload protection in accordance
with IEC/UL 61800-5-1?
Overview
The thermal motor model of the converter fullls motor overload protection according to IEC/
UL61800‑5‑1.
For motor overload protection according to IEC/UL61800‑5‑1, some parameters of the
thermal motor model may also need to be adjusted.
Requirement
You have correctly entered the motor data during quick commissioning.
NOTICE
Thermal overload of third-party motors due to a trip threshold that is too high
With a Siemens motor, the converter sets the trip threshold of the thermal motor model to
match the motor. With a third-party motor, the converter cannot ensure in every case that the
trip threshold is exactly right for the motor. A trip threshold that is set too high can lead to a
thermal overload, thus causing damage to the motor.
• If required for a third-party motor, reduce the corresponding trip threshold p0605, p0615,
or p5391.
Procedure
1. Set p0610=12.
2. Set the following parameters depending on the motor:
– Induction motor:
p0612.1=1
p0612.9=1
For a motor without temperature sensor: p0625=40°C
– Synchronous motor
p0612.0=1
p0612.8=1
For a motor without temperature sensor: p0613=40°C
The trip threshold p0605, p0615 or p5391 parameterized in the motor data set may not be
increased.
Advanced commissioning
8.26How do I achieve a motor overload protection in accordance with IEC/UL 61800-5-1?
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK 343
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