Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
697
of 820
4
6.43 Motor I
2
t monitoring mode
The accordant implementation to calculate the l
2
t value of the motor must be selected.
Generally, the parameter is assigned to zero (speed-dependent monitoring is deactivated
and the monitoring of the apparent current is activated). See
ZOverload monitoring of the
motor (I
2
t)– from page 731.
1)
These methods require valid motor data. The parameter >6.43< does not accept the entered value if there
is no valid motor data.
2)
Combinable with all motor l
2
t modes
6.46 Motor I
2
t derating factors
Includes the derating factors in the elements 6.46[0] and 6.46[1] in percent relating to the
rated current to interpolate the current limit curve for standardized asynchronous ma
-
chines without forced ventilation. Thereby, the element in 6.46 [0] defines the maximum
continuous current in the standstill operating point and 6.46 [1] defines the operating point
at the half rated speed.
In general, both derating factors provide a value of 100% which accords to the speed-in-
dependent standardized solution of the l
2
t monitoring (refer to ZTemperature monitoring
of the motor– from page 731). The minimum value corresponds to 10%.
6.47 Operation grade real power
The real power limit load is displayed.
Is evaluated at single-phased devices, only in which the maximum real power limit was
parameterized in the power unit characteristics as well.
Bit Meaning
2 ... 0 Value Speed dependent modes
0 Deactivated
1 Continuous current limit identification by current-supporting
points and interpolation
1)
2 Continuous current limit identification by approximation of core
losses
1)
3 Derating identification of machines having no separately ventila-
tion
1)
4 to 8 Reserved
3 Current monitoring type:
2)
0: Apparent current
1: Single phases
15 ....4 Reserved
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