ETAS ES1392.1, User Manual

Page: 15 / 36

Hardware 15
2.9 Parallel Switching of Several Battery Nodes
To increase the maximum current of the battery nodes, the two 20-A battery
nodes, BN0 and BN1, can be switched in parallel. The overcurrent protection
of the switches to +UBatt of these two battery nodes is synchronized, i.e. they
are both switched off (simultaneously) when an overcurrent is detected and
then are both switched on again simultaneously.
To increase the maximum current of the battery nodes, two or all of the 12-A
battery nodes, BN2, BN3 and BN4, can be switched in parallel. The overcurrent
protection of the switches to +UBatt of these three battery nodes is synchro-
nized, i.e. they are all switched off (simultaneously) when an overcurrent is
detected and then are all switched on again simultaneously.
2.10 Potential Difference between Ground and -UBatt
The potential difference between ground and -UBatt must not exceed ±2 V.
Otherwise the functionality of the board can no longer be guaranteed and the
board may even be damaged.
2.11 Battery Voltage at the "BATTERY NODES" Connector
-UBatt and +UBatt are available at the "BATTERY NODES" connector. Both
voltages are protected.
2.12 Protective Measures
The battery voUBatt and -UBatt supplied by the power supply to "BAT-
TERY INPUT" are protected by fuses in their individual current paths.
The battery node switches themselves are protected electronically against over-
current. The battery voltages, supply voltages and the MRC signal at the front-
facing connectors are protected by fuses.
There is no fuse protection of the overall current of +UBatt. The overall current
of +UBatt must not exceed 40 A.
note
Only the same type of battery node can be switched in parallel. 20-A and 12-A
channels cannot be combined.
The maximum overall current of 40 A must not be exceeded.