18
1600XPi Series UPS Installation and Operation Manual – 60616-014
9.3 Battery Backup (On batteries)
The following illustration shows power flow during the battery backup mode. When commercial AC power failures occur, the
UPS’s batteries instantly begin supplying DC voltage to the UPS’s main inverter circuit. This circuit changes (inverts) the DC
power into AC power. The AC power is available at the output of the unit.
This back-up process will continue until the UPS’s battery voltage drops below a specific minimum level. When this occurs,
the batteries will stop supplying power to the load. This minimum level is the rated minimum voltage (Vmin). The rated
battery voltage chart on
page
19 shows (Vmin). The battery backup time and
discharge process is explained on
page
19.
POWER FLOW IN BATTERY BACKUP FOR ALL MODELS
Output
Power
Line Filter
*Static Switch
Isolation
Transformer
Input
Power
Input
Fuse
Power Flow
Bypass
* Switches are
solid state
devices.
MCCB
Output
Fuse
Surge
Absorber*
Batteries
+
–
Rectifier/
Chopper
Inverter
Negative Bus
9.4
EPO (Emergency Power Off) Function
These units are equipped with terminals for receiving an emergency power-off (EPO) command via a closed-contact switch
at a remote location (see Terminal Block Details on
page
11, and terminal block location in Appendix C). This safety feature
enables quick shut-down of the UPS’s AC input breaker, output and battery circuits.
WARNING
After activation of EPO, dangerous voltage still exists within the
UPS. Ensure that all AC and DC power sources are removed and
then wait for 5 minutes before servicing the UPS.
Usually the emergency power off switch is installed in a central location that is easily accessible to personnel concerned with
the operation of the UPS unit and the load equipment connected to it. The EPO function is initiated by pressing the switch
to the closed (shutdown) position.
The effect of using the EPO switch is the same whether the UPS unit is in AC input mode, battery backup mode, or the circuit
bypass mode. The following figure shows the UPS condition after application of the EPO switch.
POWER FLOW AFTER AN EPO COMMAND FOR ALL
MODELS
Output
Power
Line Filter
Inverter
*Static Switch
Isolation
Transformer
Input
Power
Input
Fuse
Power Flow
Bypass
* Switches are
solid state
devices.
MCCB
Output
Fuse
Surge
Absorber*
Batteries
+
–
Rectifier/
Chopper
Negative Bus
*Surge Absorber is connected as indicated in 3.6–10kVA units. Surge Absorber is connected at the point between the Line Filter and Input Fuse in 14–22kVA units.
Summary of Contents for 1600XPi SERIES
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