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 Series Installation and Operation Manual – 64527-008
FIGURE 12.2: EFFECT OF EPO ACTIVATION