Eaton SV9000 - 11.9 Seal Leak Detection Delay; 11.10 High Vibration Delay

SV9000 Motor Pump Enhanced Protection Application Page 37 (60)
7.9 Motor thermal protection break point frequency
The frequency can be set between 10—500 Hz.
This is the breakpoint of thermal current curve. With frequencies above this point the
thermal capacity of the motor is assumed to be constant. See figure 6.2-20.
The default value is based on the motor's name plate data, parameter 1.11. It is 35 Hz for
a 50 Hz motor and 42 Hz for a 60 Hz motor. More generally it is 70% of the frequency at
field weakening point (parameter 6.3). Changing either parameter 1.11 or 6.3 will restore
this parameter to its default value.
Trip/Warning
Par. 7.5
Time constant T ➊
➊ Changed with motor size and adjusted with Par. 7.8
Time
Motor temperature
105%
Motor
current
I
I
T
Motor temperature Ø = ( )
2
× (1 – e )
I
I
T
–
t
T
Figure 6.2-20: Calculating Motor Temperature