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
34
TOSHIBA
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
4200FA User's Manual
Output
Power