Operator Controls - Toshiba 4400 Series Installation And Operation Manual

12.3

Operator Controls

Bypass/On-Line Switch
Switches the UPS between On-Line and Bypass modes.
Display Reset Switch
Allows the display to be rebooted without powering down the UPS. The display can be reset by pressing
the Reset Switch with a thin probe, such as a paper clip.
EPO (Emergency Power Off) Function
These units are equipped with a front panel mounted EPO switch.
This safety feature enables quick shutdown of the UPS AC output and battery circuits.
The EPO function is initiated by pressing the red EPO switch. The effect of using the EPO switch is the
same whether the UPS is in the AC Input Mode, Battery Backup Mode, or the Bypass Mode.
The following figure shows the UPS condition after application of the EPO switch. See Section 13.4
Restore System Power after an EPO Shutdown.
4400 UPS
AC Input
3Φ 4W
MCCB
TRIPPED
Ground
Wire
68
Bypass Thyristor
Contactor
SYNC
Fuse
OFF
Input
AC/DC DC/AC
Contactor
Converter Inverter
DC/DC OFF
Converter
FIGURE 12-2 – EFFECT OF EPO ACTIVATION
4400 Series Installation and Operation Manual – 64527-006
Fuse
OFF
Output
Contactor
AC Output
3Φ 4W