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Three Phase Emergency Lighting Inverter User’s Manual
#018-7002-00
1.6.C.
AC Loss/Battery Operation
Referring to Figure 3, if the input power is interrupted, the battery will immediately supply the DC power
required by the Inverter to maintain continuous AC power to the load. A fully charged battery will provide
power for the specified time at the rated load, or longer at reduced load.
In the event of a power failure, the rectifiers will de-energize and the batteries will discharge into the Inverter
and maintain power to the critical load until a) the battery capacity expires and the inverter turns off, or b)
input power is restored after which the rectifiers will power the inverter and simultaneously recharge the
batteries. Figure 3 illustrates the flow diagram during battery operation.
When power is restored after a low battery shutdown, the rectifiers automatically restart and, recharge
the batteries and the Inverter is automatically restarted without operator intervention. The inverter auto-
matically without operator intervention assumes the power from the Rectifier.
Figure 2 Single Line Drawing - Static Bypass Operation
Figure 3 Single Line Drawings -AC Loss/Battery Operation
(AC to DC Rectifier). The Inverter also convert AC to DC (Rectifier) to be able to generate clean AC
power to supply the critical load.
The conversion - inversion process eliminates any voltage transients or fluctuations existing in
the input power before it reaches the critical load.
1.6.B.
MANUAL BYPASS OPERATION
Refer to Figure 2. A Manual Bypass Switch is provided as a standard feature of the DSPM’s UPS. This
switch is to bypass the inverter logic incase of failure, to enable the end user function until service can be
performed. The advantage of this form of bypass is that the input filtering is still providing protection to the
critical loads on the UPS. Figure 2 illustrates the flow diagram when the UPS has been manually by-
passed.
