2.0 SSG UPS CIRCUIT DESCRIPTIONS
Input Filter
This portion of the circuit provides surge protection, certified to meet IEC 61000-4-5 and IEC 801-5.
It also filters out both electro-magnetic interference (EMI) and radio frequency interference (RFI) and
prevents excessive levels from being conducted back to the utility source. All SSG Series rackmount
models have been tested and comply with FCC Class B requirements.
Input Power Factor Correction
While the UPS is operating from the utility source, this circuit converts utility AC power to regulated
DC power for inverter use. It corrects the input current to maintain a sine waveform to minimize the
amount of current distortion that will be reflected back to the utility.
DC/DC Converter
The DC/DC converter utilizes energy from batteries and boosts up the DC bus voltage to a level
required by the inverter. This allows the inverter to operate continuously at optimum efficiency and
voltage. The converter incorporates a patented circuit which reduces the amount of ripple current
and EMI interference to the battery, increasing the overall battery life.
DC/AC Inverter
In utility mode operation, the inverter utilizes the regulated DC output to invert DC back into clean,
regulated sinewave AC power. When utility power fails, the inverter will receive its energy from the
battery through the DC/DC converter. In both modes of operation, the UPS inverter is on-line and
continuously generating clean, regulated AC output power to the load. The IGBT, PWM inverter is of
a very robust design and produces a pure sinewave output with a +/-2% voltage regulation. Having a
very low output impedance, it can supply the high current demands of high inrush and non-linear
loads.
Battery Packs
The SSG Series UPS utilizes a flame retardant battery pack comprised of four 12V, 7AH,
valve-regulated, sealed lead acid (VRLA) batteries in each pack. All SSG battery packs are
interchangeable between SSG 1.5kVA-3kVA models. They are easily replaced through the UPS front
panel. See replacement instructions outlined in this manual.
To maintain the optimum battery life, the user should operate the UPS in an ambient temperature of
68ºF to 77ºF (20ºC to 25ºC). Some SSG Series UPS models have batteries that may be rated oper-
ational at -20º C - 55º C (-4º F to 131º F), at these temperatures, battery life will be substantially
reduced. Optional extended battery modules are available through Falcon and will extend the
amount of battery runtime. Please refer to the exact UPS model in the attached specificaitons for the
specific battery option part number.
Battery Charger
The battery charger utilizes energy from the utility power to continuously charge the UPS batteries.
The charger operates in "constant power" mode. The UPS batteries are being charged whenever the
UPS is plugged in, turned on and operating from utility power. The internal UPS battery charger
output is rated at 1 amp.
CAUTION: When making battery bank connections to the UPS, alwasy verify the battery bank
circuit breaker(s) are in the off position. PRIOR to turning on the first battery bank circuit
breaker, ALWAYS DEPRESS AND HOLD THE BATTERY PRECHARGE PUSHBUTTON LOCATED
ON THE UPS REAR PANEL WHILE TURNING ON THE FIRST BATTERY BANK CIRCUIT
BREAKER TO PREVENT UPS DAMAGE.
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