Siemens SIPROTEC 7SK80 Manual page 154

Functions
2.9 Thermal Overload Protection 49
Example:
Machine: I
Nom Mach
=1.15 I
I
max Mach
= 93 °C Temperature at I
Θ
Nom Mach
= 600 s (thermal time constant of the machine)
τ
th
Current transformer: 500 A / 1 A
Motor Starting Recognition
The motor starting is detected when setting I MOTOR START at address 1107 is exceeded. Information on
how to perform the configuration is given under "Recognition of Running Condition (only for motors)" in
Subsection2.1.3.2.
154
= 483 A
at Θ = 40 °C
Nom K
Nom Mach
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010