Control Buttons; Alarm Buzzer; Figure 70 Control Button Layout; Figure 71 Alarm Buzzer Location - Emerson Liebert APM 15-90kVA Manual

9.3

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 70. The
function of each button is described in Table 24.
NOTE
To activate a button properly, press and hold until you hear a short beep—about two seconds.

Figure 70 Control button layout

E MER SO N
LCD Navigation Keys
Table 24 Control buttons
Button
(see Figure 70)
EPO
INVERTER ON
INVERTER OFF
FAULT CLEAR
SILENCE ON/OFF
9.4

Alarm Buzzer

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.

Figure 71 Alarm buzzer location

Buzzer
TM
Network Power
STATUS
F1 F2
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.
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.
Press this button to shut down the inverter during operation. The load will be transferred to
static bypass.
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.
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.
E ME R S O N
TM
Network Power
STATUS
F1
INV E RTE R OFF
S ILE NCE ON/ OFF
HELP
F3 F4
INV E RTE R ON
Function
E P O
FAULT CLE AR
INV E RTE R OFF
S ILE NCE ON/ OFF
F2 F3 F4 HELP
INV E RTE R ON
87
Operator Control and Display Panel
EPO Button Cover
EPO Button
Inverter Off Button
E P O
Fault Clear Button
FAULT CLE AR
Silence On/Off Button
Inverter On Button
® ™
Liebert APM