Emerson 115-50/60HZ Manuel D’Utilisation

The Control Buttons on the front panel may be used to shut down the UPS completely, turn the 

inverter on or off, restart the UPS after a fault and silence the alarm, as shown in Figure 53. The 

function of each button is described in Table 25.

The alarm buzzer produces three types of sounds:

• Single beep - when any Control button is pressed
• Single beep repeating every two seconds - the system has a general alarm
• Continuous - the system has a serious fault

If the alarm buzzer makes no sound, the system may be operating properly or the alarm may have 

been silenced manually. 

NOTE
To activate a button properly, press and hold until you hear a short beep—about two seconds.

(see Figure 53)

EPO

Completely shuts down the UPS, including the static switch.
CAUTION:

 Use caution before pressing the Emergency Power Off (EPO) button. This 

button completely shuts down the unit and the critical load.

INVERTER ON

Press this button to start the inverter and transfer from static bypass to inverter.
NOTE:

 If the inverter is not ready, this will not activate the UPS.

INVERTER OFF

Press this button to shut down the inverter during operation. The load will be transferred 
to static bypass.

FAULT CLEAR

After the UPS shuts down due to a fault and the alarm condition has been resolved, press 
this button to clear the fault and restart the UPS.

SILENCE ON/OFF

Press this button once to silence the alarm buzzer when an alarm is active. Any new fault 
will sound the buzzer again.
If the alarm buzzer is not beeping, press this button to test the alarm sound. 

TM