Function descriptions 02.00
9-30 SIEMENS AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
Fault message triggering by motor I
2
t monitoring function
This diagram shows how long it takes for a fault message to be triggered if, after a long preloading
period (> 5
*
T_th), a new constant load value is injected abruptly.
T_th = P114 .. thermal time constant of motor
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
00,511,522,533,5
Time / thermal time constant of motor
Load current / rated motor current
0% preloading
20% preloading
40% preloading
60% preloading
80% preloading
NOTE
When the electronics power supply fails for longer than 2 s, the calculated motor preloading
value is lost. When the supply is reconnected, the system assumes that the connected motor has
not been loaded at all!
If the converter is switched on again (e.g. with "Automatic restart function") within 2 s of the
electronics power supply failing, then the last calculated l
2
t value of the motor is applied.
The I
2
t monitoring function reproduces only a rough thermal image of the motor, i.e. it does not
provide all-round motor protection.
If P114 (T
motor
) is set to zero, then the I
2
t monitoring function is deactivated.
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