This section presents operating information for Comet UPS
systems, including an overview of system operation, controls
and indicators, start-up, operating procedures and alarms.
During normal operation the AC input source supplies the
Rectifier, which converts the incoming AC power to DC. The
rectifier in turn supplies the Inverter, which converts DC
power to AC to supply the attached load (see Figure 3-1).
Figure
P o w e r f l o w, n o r m a l o p e r a t i o n
3-1
When AC input power fails, the UPS goes to on-battery
operation. DC power is supplied from the UPS battery
system to the inverter, which converts battery power (DC) to
AC power to supply the attached load (see Figure 3-2).
Figure
P o w e r f l o w, o n - b a t t e r y o p e r a t i o n
3-2
Should there be an internal fault in the UPS, the load will
automatically be transferred to the "Static Switch" ( if bypass
AC input is within tolerance). The load is supplied without in-
terruption while the UPS is bypassed (see Figure 3-3).
INVERTER
BYPASS
INPUT
(OPTIONAL)
MAIN
INPUT
BATTERY
RECTIFIER
TO LOAD
STATIC SWITCH
INVERTER
BYPASS
INPUT
(OPTIONAL)
MAIN
INPUT
BATTERY
RECTIFIER
TO LOAD
STATIC SWITCH
3.1
Overview
3.0
Scope
3 — 1
Operation
Operation
