COVER series MZ – User manual
COMEX S.A.
3. UPS operation modes
This chapter describes the basic modes of the UPS's operation, battery management and
protection.
Warning: There are dangerous voltages - mains and batteries inside the power supply
Inside the UPS, there are no components requiring user. Only the authorized service of the
manufacturer has the option of opening the UPS enclosure.
3.1. Introduction
The UPS guarantees the highest reliability of power for critical devices. The voltage parameters
generated by the power supply are stable and free of fluctuations in both voltage and frequency,
and completely independent of the voltage parameters in the professional network.
Obtaining high quality parameters guarantees high frequency double processing with pulse
width modulation (PWM), all controlled using digital signal processing (DSP) which ensures high
reliability and convenience of use.
3.2. Principle of operation
As shown in the figure below, the supply voltage from the professional network powers the UPS
rectifier. The rectifier converts alternating voltage (AC) to DC voltage. The DC voltage supplies
the inverter system, which converts the DC voltage into a stable alternating voltage (AC), which
is completely independent of the input voltage. In the absence of mains voltage, the inverter
system is supplied from the voltage accumulated in the batteries. In the case of maintenance
work, or in the event of overloading, overheating or other events on the UPS, a back-up power
supply line is used Bypass track.
AC
DC
DC
AC
DC
DC
Maintenance bypass
Bypass input
Mains input
Battery input
Bypass unit
Power unit
Output
Figure 3-1 Block diagram of the power supply
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General