7.5 kVA - 15 kVA UPS
Parallel for Redundancy System
User’s and Installation Manual
1012833
Revision 4
7
The battery switch determines the direction of the current to or from the battery. In
normal mode the mains is supplying the load, the switch is open and the battery is
kept fully recharged. When there is a failure in the mains supply, the switch is closed
and the battery is feeding the load.
The control and monitoring circuits with ABM-system (Advanced Battery
Management) monitor and control the operation of the UPS-system including
automatic battery test. They show the user the status of the system operation by
visual and audible indicators. The UPS sends information about the system
operation via potential free relay outputs and two serial data interfaces (RS232). (UPS
can be shut down remotely via computer interface.) This information includes data
about utility, load and the UPS itself. The information can be used in a computer to
ensure total protection of software and data.
Fig. 2. Block diagram of the UPS.
2.2 System configuration
The parallel for redundancy UPS system consists of two equal power size UPS with
internal backup battery and a common parallel module.
In addition, several options may be included in the system. The options are used to tailor a
matching solution to fulfil the site and load requirements of the installation.
The main considerations in planning the UPS system are:
The UPS system output power rating (VA) shall be specified according to the total
power demand of the protected system. Some margin should be allowed for potential
expansion of the protected system, and for possible inaccuracy in calculating or
measuring the actual power requirement.
The battery shall be sized according to the desired backup time. Note that the backup
time is longer if the load is less than the nominal power rating of the UPS.
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