Xylem SSW-07 Soft-Starter - Manual (Page 34)

CHAPTER 4 - SETTING THE SSW-07
33
English
4.8 MOTOR
ELECTRONIC
OVERLOAD
PROTECTION
Motor Current
Setting Trimpot
Figure 4.7 - Motor current setting
The motor electronic overload protection simulates the heating and
cooling of the motor, also known as thermal image. This simulation
uses as input data the True rms current.
When the thermal image passes the limit, the overload protection
trips and turns the motor off.
The adjustment of the thermal class is based on the motor locked
rotor current and locked rotor time. With this data it is possible to
find a point in the figure to determine, which thermal class protects
the motor. Please refer to figure 4.8 for cold stall time or to figure
4.9 for hot stall time. The thermal classes below the point protect
the motor.