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8.3 Control Buttons
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 48. The
function of each button is described in Table 16.
Figure 48 Location of control buttons
NOTE
To activate a button properly, press and hold until you hear a short beep—about two seconds.
Table 16 Control buttons
Button
(see Figure 48) Function
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 cuts off power to the critical load.
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.
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.
Silence On/Off button
INVERTER ON
SILENCE ON/OFF
INVERTER OFF FAULT CLEAR
EPO
LED1
LED2
LED3
LED4
LED5
STATUS
F2 F4 HELPF1 F3
?
L-N current (A)
Frequency (HZ)
L-L voltage(V )
PowerFactor
L1-N/L2
71.4
59.9
480
0.99
L2-N/L3
70.8
59.9
480
0.99
L3-N/L1
71.3
59.9
480
0.99
Output
Input disconnect closed 01-06 09:15
B ypa ss a bnorm al 01 -06 0 9: 15
Liebert NX 2007-01-06 09:20:37
Single
Normal80kVA-3X3
Output disconnect closed 01-06 09: 15
Bypass
Main
Button cover
EPO button
Inverter On button
Inverter Off button
Fault Clear button