OnLine Power
(6002-1646) REV.X8 21
9. Optional O utput Isolat i on Transfor m er (TI) — The transformer p erforms a number of
critical functions. First, it provid es excellent common mode an d normal mode noise
isolation of the load from the in put or i nverter power. Secondly, it prov i des voltage
transformation and tight reg ul ation of the output voltage whi le t he Fire Alarm Back-up
UPS1481 is operating from its int e rnal inverter or directly from ut ilit y v ia by pass circuitry.
10. lnverter Test Swit ch (S W2) — This switch is a manually o pe rated switch which tests the
Fire Alarm Back-up UPS14 81 a nd the batteries for proper operat i on. When the Fire Alarm
Back-up UPS1481 is running and Switch SW2 is pushed and held i n, the Fire Alarm Back-
up UPS1481 will automatically transfer to battery ope rati on. The Fire Alar m Back- up
UPS1481 will continue to run on b atteries until the switch is rele as ed back to the “normal”
position (Switch is a moment ary s witch). When the switch is release d, the Fire Alarm
Back-up UPS1481 returns to normal operation (provided in put power is present).
11. Control Transforme r (T2) — This transfor m er with fuse (Fl), provides (internal
housekeeping) power supply as well as 120 VAC for the coil of the in put contactor. The
primary of this transformer h as v ari ous taps that needs to be matc he d w it h t he various
input voltages.
12. Fan Transfor mer (T3) — This transf o rmer with fuse (F2) provides 12 0 V AC to the fan(s)
for various output voltages that ar e matched at its primary taps.