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

10.3 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
time and discharge process is explained on
MCCB
Input
Power
Surge
Absorber
POWER FLOW IN BATTERY BACKUP FOR ALL MODELS

10.4 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
location in Appendix C). This safety feature 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.
MCCB
Input
Power
Surge
Absorber
1600XP/XPi Series Installation and Operation Manual – 60616-012
page 19.
Bypass
Input
Fuse
Rectifier/
Line Filter
Chopper
Batteries
Negative Bus
Bypass
Input
Fuse
Rectifier/
Line Filter
Chopper
Batteries
Negative Bus
POWER FLOW AFTER AN EPO COMMAND FOR ALL MODELS
page 19 shows (Vmin). The battery backup
*Static Switch
Transformer
Output
Fuse
Inverter
+
* Switches are
–
solid state
devices.
page 11, and terminal block
*Static Switch
Transformer
Output
Fuse
Inverter
+
* Switches are
–
solid state
devices.
Isolation
Output
Power
Power Flow
Isolation
Output
Power
Power Flow
17