OM226142 rev C
8
2 UPS GENERAL DESCRIPTION
The UPS of the HALLEY/E series is the type “ON LINE DOUBLE CONVERSION” and is
connected between main power and user loads (see picture 1). As far as architecture and
lay-out is concerned, this project is optimised with particular care in order to make it
suitable for applications where reliability and high performances are fundamental for
critical loads.
The UPS operation is optimised by microprocessor digital control and the IGBT inverter is
based on a high frequency PWM waveform.
The whole UPS is monitored by a DSP 16 bit microprocessor, implementing full digital
control.
Procedures for power-on, power-off, switching to and from bypass are described step by
step on LCD display, so to help users to easily operate the UPS.
Results of electrical measurement, alarm, work condition, event log and battery state are
displayed real time on the LCD front panel.
Picture 1 – UPS block diagram
With this configuration UPS guarantees high quality output, needed by loads requiring
stable and clean source of power. The main features are:
• Protection for black-out, in the limits of battery autonomy
• Complete filtering of main power noise
• High quality output power, provided under any condition of input power and loads
• Stable output frequency, independent from input frequency
• Full compatibility with every type of load
• Configurable with any neutral wire configuration (under request)
• Automatic control of battery, during both charging and discharging phases
• Easy to interface with user devices
• Auto-diagnostic feature and troubleshooting support
• Flexibility of complete bypass configuration
• Full access from the front and from the roof for maintenance
The block diagram shows the UPS subsystem that will be analysed in the following
chapters:
• Rectifier/Battery Charger (R)
• Inverter (I)
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