SMARTZONE UPS USER MANUAL
6
Line Interactive Overview
The UPS input is connected to an AC power source via an input plug. The output is
connected to loads via outlets on the UPS. The load may be powered from the input
source (through the Automatic Voltage Regulation (AVR) – boost/buck circuitry) or the
battery (through the inverter). The following block diagram explains the UPS Modes and
UPS States described in the sections below.
Figure 2: High-Level Generic Line Interactive UPS Block Diagram
UPS Modes
The double conversion UPS may be configured into four different working modes. The
line interactive UPS may be configured into two different working modes. This section
explains these settable working modes. The UPS working mode is manually configured
into the UPS at setup time. The selected mode will become the Default state of the UPS
until the working mode is manually changed.
Normal Mode
Double Conversion
Normal mode is the default working mode of the double conversion UPS units. When
the UPS is operating in Normal mode, it provides a stable pure sinusoidal AC power
output and charges or maintains the charge on the battery. In Normal mode, the input
and output relays are closed, and the bypass relay is open. The rectifier/charger derives
power from the AC Input and supplies DC power to the inverter while simultaneously
charging or maintaining the charge on the battery. The inverter inverts the DC power to
AC power and supplies it to the load with a stable pure sinusoidal AC waveform.