Baumuller b maXX BM3400 Series - Page 58

T 6 Installation
NOTE
If at the same time control supply (24V) and mains supply are switched on, there is a delay
caused by the boot sequence. After the boot sequence, when the first measurement of DC link
voltage takes place, the adjustable limit is exceeded by far. If the control supply is switched
on long b efore switching on the mains supply, measurement of DC link voltage can take place
in time and activation of the precharge relay occurs just after getting the first value above the
limit. Thats why there could be current peaks.
At default values and common mains environment a peak of about the peak current of the
device for a duration of 2-3ms can be expected. These values are also to be expected in case
of returning of the mains supply. Therefor device protection should be dimensioned for the
devices peak current.
The following figures show examples of the current values at the DC link circuit (result of overlaying the cur-
rents of all three phases) for devices BM3411-L3 (V2) resp. BM3411-L1 (V2) during precharge w ithout acti-
vation of the precharge relay. Other b maXX® BM3400 devices will show similiar current values but smaller
peak values.
0
50
100
150
200
250
300
0 0.1 0.2 0.3 0.4 0.5
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
voltage [V]
current [A]
time [s]
BM3411-L1 V2
DC link voltage [V]
current [A]
current (rms value) [A]
Figure 6.2: Precharge current values single phase (without activation of precharge relay)
58 Instrution Manual b maXX ® BM3400
from 206 Doument No.: 5.07013.03 Baumueller Kamenz GmbH