Page 11
P O W E R I N G T E C H N O L O G Y
Manual No. aspiro2u-3
aspiro2u_m23-man-rev3-0516.indd
2.3 System Components
The Aspiro system is delivered with all components mounted according to the ordered
configuration. The main components are described below and in later chapters of the manual.
2.3.1 System Controller
The Aspiro power system can be controlled by the ACC Extended or PCC controller. The
description and operation of these controllers is covered in separate manuals which are
available at:
ACC Extended:
http://www.unipowerco.com/pdf/acc-man.pdf
http://www.unipowerco.com/pdf/pcc-man.pdf
2.3.2 DC Distribution Unit
The distribution unit can be configured for a variety of pluggable battery and load breaker
selections, a shunt for battery current measurement and fuse alarms for load and battery
breakers. The front access enables easy replacement of breakers and fuses if needed.
The distribution unit is designed for switching the battery and load on and off. The
battery and load breakers (MCB) are supervised by measuring the voltage drop across
each breaker. In case of load breakers, any MCBs that are not connected to a load will
not cause breaker alarm even if they are left open.
A battery fuse alarm is generated after the battery voltage drops below a certain level.
This depends on the actual battery capacity and condition.
2.3.2.1 Low Voltage Disconnect (LVD)
The system is equipped with low voltage battery disconnection, which prevents the
batteries from deep discharging, thus prolonging the battery life. The disconnection
requires detected mains failure at the controller. If disconnection occurs, the batteries are
reconnected when the mains supply is restored.
A maximum of two breakers with current rating maximum 100A can be installed.
2.3.2.2 Partial Load Disconnection / Load Shedding (PLD)
During a mains outage the controller opens the PLD contactor when the batteries have
discharged down to a certain voltage or if the battery voltage has been under a certain
voltage for a predetermined time. The disconnection has to be set according to the present
load and battery manufacturer’s discharge tables or requirements.
A maximum of seven breakers with current rating maximum 30A can be installed.
