Siemens SINAMICS DCM Operating Instructions Manual page 436

Dc converter

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Descriptions of functions

10.17 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 10-48 Thermal equivalent time constant

● Please observe the manufacturer's specifications if you are using other motor types.

● If you are using DC motors 1G.5/1H.5 as per Catalog DA12, p50113 must be set to 1.00.

, thermal equivalent time constant [min] (p50114)

I = Maximum overcurrent at which the motor is operated

= Rated armature current for the motor (p50100)

Operating Instructions, 1.2012, C98130-A7066-A1-05-7619

SINAMICS DCM DC Converter