Siemens SINAMICS DCM Manual page 545

Descriptions of functions
10.19 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):
y ... T
x ... I/I
I = Maximum overcurrent at which the motor is operated
I
Figure 10-72 Thermal equivalent time constant
Notes
● 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.
546
, thermal equivalent time constant [min] (p50114)
therm
[%]
N
= Rated armature current for the motor (p50100)
N
ac.maher.co.ir
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001