Siemens SINAMICS Series Operating Instructions Manual page 263

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Incorrect temperature measured values as a result of cables with an excessively high

An excessively long cable length or an excessively small cable cross-section can falsify the

temperature measurement (for a PT100, 10 Ω cable resistance can falsify the measurement

result by 10%). As a consequence, excessively high measured values are output, which

could lead to the motor being unnecessarily tripped prematurely.

• Use only cable lengths ≤ 300 m.

• For cable lengths >100 m, use cables with a cross-section of ≥1 mm

Connection examples

SINAMICS DCM DC Converter

Operating Instructions, 12/2018, A5E34763375A

Connecting a PT100/PT1000 with 2x2, 3 and 4-wires to the temperature sensor inputs

X53x of Terminal Module TM150

Additional system components

7.6 Terminal Module TM150