Battery Backup (On Batteries); Epo (Emergency Power Off) Function - Toshiba 1600XPi Series Installation And Operation Manual

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
Input
Power
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
enables quick shut-down of the UPS's AC input breaker, output and battery circuits.
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.
Input
Power
*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.
18
page 19 shows (Vmin). The battery backup time and discharge process is explained on
MCCB
Line Filter
Surge
Absorber*
POWER FLOW IN BATTERY BACKUP FOR ALL MODELS
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.
MCCB
Line Filter
Surge
Absorber*
POWER FLOW AFTER AN EPO COMMAND FOR ALL
Bypass
*Static Switch
Input
Fuse
Rectifier/
Inverter
Chopper
+
Batteries
* Switches are
–
solid state
devices.
Negative Bus
page 11, and terminal block location in Appendix C). This safety feature
WARNING
Bypass
*Static Switch
Input
Fuse
Rectifier/
Inverter
Chopper
+
Batteries
* Switches are
–
solid state
devices.
Negative Bus
MODELS
1600XPi Series UPS Installation and Operation Manual – 60616-014
Isolation
Transformer
Output
Fuse
Output
Power
Power Flow
Isolation
Transformer
Output
Fuse
Output
Power
Power Flow
page 19.