Epo (Emergency Power Off) Function; Audible Alarm Functions - Toshiba 4200FA XT Installation And Operation Manual

6.6

EPO (Emergency Power Off) Function

The 4200FA UPS system is equipped with terminals for receiving an emergency power-off
(EPO) closed contact switch command from two locations: (1) a remote location (see Section
4.2 Terminal Block Details) and (2) from a front panel mounted EPO switch (see Section 6.5
Front Panel Layout).
This safety feature enables quick shutdown of the UPS AC output and battery circuits.
Typically 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 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 6.1.1), battery backup mode (see Section 6.1.3), or the circuit bypass
mode (see Section 6.1.2). See EMERGENCY OFF screen in Section 6.12 Shutdown
Procedure. The following figure shows the UPS condition after application of the EPO switch.
Use the Start-up Procedure (see Section 6.11) for restarting the unit.
Power Flow
Isolating
XFMR
Input
Power
6.7

Audible Alarm Functions

While in the battery backup mode, during a fault, during a low battery condition, or if the
system is in an overload condition, an audible alarm will sound. The following table shows the
audible alarm pattern for each condition. Time intervals are shown in seconds. The audible
alarm can be stopped by pressing the BUZZ STOP key (see Section 6.5 Front Panel Layout).
Condition
UPS in Battery Backup Mode
(Battery Voltage 100-90%)
UPS Low Battery
(Battery Voltage < 90%)
Overload
Fault
4200FA XT 80kVA Installation and Operation Manual
OFF
MCCB
Converter
TRIPPED
.5 S
OFF
Static
Bypass
OFF
Inverter
OFF
Charger/
Chopper
External
Batteries
Audible pattern
7 S 1 S
1 S 1 S
.5 S
.5 S .5 S
Output
Power
35