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KraftPowercon Sweden AB, Hjalmar Petris väg 49, S-352 46 Växjö, Sweden, Tel: +46 470-705200, Fax: +46 470-705201,
www.kraftpowercon.com
The only thing that actually distinguishes different configurations from the monitoring unit's
perspective is the number of distribution boards that can be connected to both sub-systems via
cross-connector breakers. Regardless of the complexity in this, there are still only two simple
points that need a solution:
1.
System A must be notified whether the two sub-systems are connected or not in order to
handle the earth fault measurement.
The cross connector breakers are fitted with breaking auxiliary contacts. These are connected
to the input “E.F. BLOCKED” in system A. This is organised in such a way that the loop is
open when both sub-systems are connected.
2.
Each sub-system must notify whether equalizing charging is to be permitted or not.
The cross connector breakers are fitted with breaking auxiliary contacts. These are connected
to the input “EQ BLOCKED” in each sub-system. This is organised in such a way that the loop
is open when the sub-system is connected to any load. If possible, even a fan guard (closing
when airflow occurs) is connected in a series with the loop.
