Epo (Emergency Power Off) Function; Audible Alarm Functions - Toshiba 4200FA User 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
T O S H I B A
TRIPPED
MCCB
Converter
OFF
.5 S
41
OFF
Static
Bypass
Inverter
OFF
Charger/
Chopper
OFF
External
Batteries
Audible pattern
7 S 1 S
1 S 1 S
.5 S
.5 S .5 S
Output
Power