Emerson Network Power M221S Manuale d'uso - Pagina 9

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Emerson Network Power M221S Manuale d'uso
Chapter 1 Introduction
5
Figure 1-3 The Principle of Battery Boost Charge
The boost charge function can be programmed to start under the following conditions.
1. Automatic start after Commercial AC Fault (programmed to start after low battery capacity or high battery charging
current is detected) or Battery Test
2. Manual start
3. Cyclic start after a predefined time schedule
Temperature compensated battery charge
In order to extend battery life, the controller can automatically adjust system voltage as battery ambient temperature
changes. Battery temperature compensated charging is a function that lowers system voltage when battery
temperature increases and raises system voltage when battery temperature decreases.
System voltage follows the characteristics as shown in Figure 1-4.
Figure 1-4 The Principle of Temperature Compensation
Battery current limitation
The controller can limit the current to the batteries by adjusting the current limit of the rectifiers. If battery current
exceeds the alarm setting of Battery Over Current, a Battery Over Current alarm is issued.
Battery prediction
The controller can calculate the remaining capacity and the remaining time of the battery while charging or
discharging.

1.3.6 Low Voltage Disconnect

The controller can disconnect the load or battery in case of under voltage or after a predefined time from when a
Commercial AC Fault occurs, in order to prevent the batteries from deep discharge. Deep discharge can result in
permanently damaged batteries.
The load or battery can be disconnected through the two internal LVD drive outputs. The features of the LVD function
are:
 The controller can manage a maximum of 2 LVDs, which are internal LVD drive outputs. The controller
disconnects these LVDs during an under voltage condition. The disconnection level for each LVD can be set
LCU+ Series Controller User Manual