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Monitoring
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
Baumüller Nürnberg GmbH
736
4.11
In general higher current (as rated current) can be applied at synchronous machines in
the speed range lower than the rated speed due to the minimized iron losses. In contrast,
in general the maximum continuous current sinks if the speed is greater than the rated
speed due to increased iron losses.
Figure 230:
Typical continuous current limit identification of synchronous motors
The l
2
t model speed dependence is provided by two solutions with the parameter
. Thereby must be considered that each method requires valid data from the elec-
tronic type plate. If these values are not available the parameter
will not accept
the value.
Continuous current with current supports and interpolation
This option (activatable by speed-dependent modes
bits 0 to 2, value = 1) re-
quires that support points are provided for the continuous current limit characteristic (S1
characteristic or S1 current limit curve) over the speed curve so that the setting of an in-
terpolated current limit curve can be made. By the current limit curve and the effective
speed the maximum permissible continuous current can be calculated. The number of
current supporting points includes 11 points whereat the first point must always be the
standstill current (
). The 10 current values remaining are entered by a fixed del-
ta of the maximum mechanical speed (
) divided by 10. The values of the current
support points can be entered by the single elements of the parameters
(107.72[0] to 107.72[10]) manually or can be called up and loaded by Baumüller ma-
chines as a pre-manufactured set via the motor data base in ProDrive. In case there is no
complete set at the supporting points or at least one supporting point is zero, this option
cannot be activated.
5000_0358_rev01.cdr
0
0
Motor current
Motor speed
Nominal speed
107.7
Nominal
current
107.9
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