Siemens SINAMICS Series Operating Instructions Manual page 588

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Table of Contents

Descriptions of functions

10.20 Thermal overload protection for the DC motor (I2t monitoring of the motor)

Determining the thermal equivalent time constant (p50114)

It should be noted that the thermal equivalent time constant depends on the maximum

overcurrent.

Thermal equivalent time constant of DC motors 1G . 5/1H . 5 according to Catalog DA12 T

(configuring notes for Catalog DA 12):

Figure 10-69 Thermal equivalent time constant

, thermal equivalent time constant [min] (p50114)

I = Maximum overcurrent at which the motor is operated

= Rated armature current for the motor (p50100)

SINAMICS DCM DC Converter

Operating Instructions, 12/2018, A5E34763375A