HEIDENHAIN MANUALPLUS 620 - Page 966

966 HEIDENHAIN Technical Manual MANUALplus 620
Temperature model in an example comparison (motor)
The I
2
t monitor responds if this calculated temperature exceeds a certain limit.
Because temperature increase and heat dissipation are uneven when the
motor is stationary or moving slowly, the I²t monitor distinguishes between
standstill and traversing mode.
This limit range is defined in a motor table or power module table The
following entries are important:
 F-AC (transition frequency in traversing mode [Hz])
 F-DC (transition frequency at standstill [Hz]; only CC 424)
0 100 200 300 400 500 600 700 800 900 1 000
0
2020
40
60
80
100
120
140
160
180
200
T [°C]
Motor temperature
Second-order temperature model
First-order temperature model
t [s]