Monitoring
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
734
of 820
4.11
Standardized solution and extended options
Within the total motor speed range the nominal current value is used as reference to cal-
culate the l
2
t actual value. Refer to chapter ZSpeed variable l
2
t overload monitoring– on
page 735 for implementations of a speed-independent l
2
t monitoring.
In general, the apparent current of the motor is monitored. However, the 3 phases are un-
equally affected. Refer to chapter ZMonitoring of the single phases– on page 738 for in-
formation about monitoring each phase separately.
Example
In the following function example (refer to ZFig. 229– on page 735) a calculation of the
l
2
t actual value is introduced with consideration to the single warning /error thresholds by
using the standardized solution (rated current of the total speed range).
Power unit: b maXX
®
BM 5xxx I
limit
= 8 A
eff
Motor: DS 56 L - 3000 I
Motor
= 5,1 A
eff
Motor I
2
t time constant T
t
= 10 min = 600 s
Power unit S1 maximum current I
limit
Z175.8– 8 A
Motor nominal current I
N
Z107.9– 5,1 A
Motor I
2
t warning threshold Z6.39– 80% (Warning threshold)
I
2
t-Motor monitoring mode Z6.43– 0
Motor I
2
t -time constant T
t
Z107.28– 600 s
Apparent current actual value I'
act
Z6.30– A jump from 0 to 100% l
limit
of
the power unit
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