Section II
General Product Information
006-0007129 10/12/2018
Rev B
9 of 60
UPS-1500 3-Phase Guide
www.synqor.com
Power flows into the unit from the AC 3-Phase delta connected INPUT (no neutral wire
connection) through a power switch. Internal fuses in the input protect the unit in the event
of a hardware failure of the 3-Phase AC to DC INPUT stage. Note: These fuses are not user
serviceable. The 3-Phase AC to DC INPUT stage provides input current limiting, Power Factor
Correction (PFC), and high frequency isolation. In the DC INPUT power option, power flows
from the DC INPUT through an electronic switch that is closed when the AC INPUT power
is absent and the DC INPUT voltage is within valid range. If power is not available on the AC
INPUT or in the optional DC INPUT, a second electronic switch is closed which interconnects
the battery to the mid-bus.
The AC OUTPUT is created by an inverter that draws power directly from the mid-bus. This
inverter provides high frequency safety isolation and a pure-sinusoidal output voltage waveform.
An optional electronic breaker can be added to the AC OUTPUT. This one pole hot side only
electronic breaker allows for fault tolerant, glitch free operation when several UPS units are
placed in parallel. This option is referred as “expanded” parallel option.
Optional DC outputs at various voltage and power levels are also available. The DC1 option is
limited to 500 W. The DC2 option can deliver up to 1250 W output. NOTE: When the DC2 option
is selected, the DC INPUT option is not available. The DC1 and DC2 outputs are isolated from
each other and from the AC OUTPUT.
Bulk energy storage capacitors are connected to the mid-bus to help smooth imbalances in
power flow between the inputs and outputs of the UPS.
There is a battery charger circuit that draws power from the mid-bus. It ensures the batteries
are normally fully charged and that the various cells are properly equalized. The battery also
contains protection circuitry to avoid damage due to improper charging or discharging, or to
excessive temperatures.
There is a communication/control port that provides a digital interface to a host computer system.
UPS in Transit Case Option
