TOSHIBA
Line
filter
6.0 Operating the UPS
6.11 EPO (Emergency Power Off) Function
These units are equipped with terminals for receiving an emergency power-off (EPO)
"closed contact" switch command from a remote location (See section 4.2 Terminal Block
Details). This safety feature enables quick shut-down of the UPS's ac output and battery
circuits, as well as all load equipment connected to the unit. It also prevents power
backfeed from the UPS to the EPO switch. 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 the ac input mode (see
Section 6.9.1), battery backup mode (see Section 6.9.3), or the circuit bypass mode
(see Section 6.9.2). The following figure shows the UPS condition after application of the
EPO switch. Use the Restart After Fatal Fault procedures (see Section 6.5.2) for
restarting the unit.
6 - 7
MCCB
Input
Abnormal
Overheating
Rectifier/
charger/
chopper
Inverter
*Static
switch
Bypass
Overvoltage/
Undervoltage
Power flow
Current Limit
Overload
Output
Input
6.12 System Protection Features
The following schematic shows the electrical locations of the protection devices on the
2.4, 3.6, 6.0, and 8.0 kVA UPS models.
_
_
_
+
Batteries
* Switches are
solid state devices
MCCB
Rectifier/
charger/
chopper
Inverter
*Static
switch
Line
filter
Surge
absorber
Bypass
Power flow
_
TRIPPED
OFF
OFF
Output
power
(off)
Input
power
_
+
Batteries
* Switches are
solid state devices
Low Battery
Level
Overcurrent
Surge
absorber
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