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6.10 Audible Alarm Functions
Audible alarms will sound when the UPS is in the Battery Backup Mode, has a fault, is at
the low battery voltage, or is in an overload condition. The following chart shows the
audible alarm pattern duration for each condition. Time intervals are shown in seconds.
The audible alarm can be silenced, by pressing “BUZZ STOP” on the keypad.
Condition Audible pattern
UPS in Battery Backup Mode
(Battery Voltage 100-92%)
UPS Low Battery
(Battery Voltage < 92%)
Overload
Fault
.5 S
.5 S
.5 S
.5 S
1 S 1 S
1 S 7 S
6.11 LED (Light Emitting Diode) Functions
The following list describes the conditions necessary for each LED lamp to be "on."
On when the UPS has normal AC input power that is within tolerance. If there is an input
power failure this LED is off. If there is no power failure and the input voltage is in an over-
voltage condition, the AC IN LED will flicker on and off rapidly (0.4 sec on and 0.4 sec off). If
there is no power failure and the input voltage is in an under-voltage condition the AC IN
LED will be off.
On when the UPS inverter is operating.
On when the UPS is in the static bypass mode.
On when the UPS is in the battery-discharge mode. If the battery is low during a battery
discharge, the BATT lamp will flicker on and off slowly (1.2 second on and 1.2 second off).
The BATT LED will go off if the battery voltage reaches the shutdown level during the
battery-discharge mode.
On when the UPS is experiencing a fault.
4200FA CT/XT User’s Manual 43