Function descriptions 05.05
9-32 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
0 0,5 1 1,5 2 2,5 3
Time / thermal time constant of motor
Load current / permissible continuous current (P100 x P113)
0% preloading
20% preloading
40% preloading
60% preloading
80% preloading
CAUTION
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 electronics power supply fails and the converter is switched on again within 2 s (e.g. via
the "Automatic restart" function), then the temperature calculation is based on the last calculated
l
2
t value of the motor..
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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