Configuration
4.3 Derating with high motor starting current
SIRIUS 3RM1 motor starter
Manual, 06/2016, A5E0345285095020A/RS-AE/005
59
4.3
Derating with high motor starting current
Motors with a high efficiency and high motor starting currents
High starting currents may have to be taken into consideration when using 3RM1 motor
starters on motors with a high efficiency (IE3 or IE4). According to the product standard
IEC 60947-4-2, the 3RM1 motor starters are designed for motors with a maximum 8-fold
starting current.
If motors are operated that have a higher starting current, refer to the following table for the
maximum adjustable motor current:
Table 4- 1
Maximum settable motor current
Motor starter version
I
eAC53a
[A] at 40 °C max. motor
starting current
3RM1.01-.....
3RM1.02-.....
3RM1.07-.....
<= 8-fold I
e
0.5
2
7
8.5-fold I
e
0.47
1.9
6.6
9-fold I
e
0.45
1.8
6.2
9.5-fold I
e
0.42
1.7
5.9
10-fold I
e
0.4
1.6
5.6
The device protection may respond sooner in the case of motors with a higher starting
current. You will find details in "Overload protection/device protection characteristic
(Page 145)".
