Audible Alarm (Buzzer); Control Keys; Lcd And Menu Keys; Lcd Screen Type - Liebert NXC 30kVA User Manual

28 Chapter 4 Operator Control And Display Panel
Alarm indicator

4.1.2 Audible Alarm (Buzzer)

UPS activity is accompanied by the two kinds of sound listed in Table 4-3.
Alarm sound
Beep every other second
Continuous beep

4.1.3 Control Keys

The operator control and display panel provides five control keys, as described in Table 4-4.
Control key
EPO switch
Inverter start switch
Inverter shutdown
switch
Fault reset switch
Alarm silencing switch
Note: It is required to hold and press the preceding keys for 2s to initiate the key function

4.1.4 LCD And Menu Keys

The operator control and display panel provides an LCD screen and five menu keys (F1 ~ F5). The menu keys are
described in Table 4-5.
Providing 320 × 240 dot matrix graphic display, the user-friendly and menu-driven LCD allows you to easily browse
through the input, output, load and battery parameters of the UPS, get current UPS status and alarm information, and
perform functional setting and control operation. The LCD also stores up to 2048 historical records that can retrieve for
reference and diagnosis.

4.2 LCD Screen Type

4.2.1 Start Screen

Upon UPS start, the UPS executes self-test, and the start screen appears and remains approximately 25 seconds, as
shown in Figure 4-2.
Off Inverter off
Rectifier not ready or critical fault (fro example, inverter relay short circuit, bypass STS
Solid red
short circuit, bypass backfeed and inverter fault, etc.)
General fault (for example, module overload, battery disconnected, fan failure and
Flashing red
parallel load sharing failure, etc.)
Off No fault
Table 4-3 Description of audible alarm
Alarm upon a general fault, for example, module overload, battery disconnected, fan
failure, parallel load sharing failure and battery discharge pre-alarm, etc.
Alarm upon a general fault, for example, inverter relay short circuit, bypass STS short
circuit, bypass backfeed and inverter fault, etc.
Table 4-4 Description of control keys
Silkscreen
EPO Cut off the load power and battery, shut down the rectifier, inverter, static bypass
ON Start the inverter
OFF Shut down the inverter
FAULT CLEAR Clear fault to restart the UPS
When an alarm is active, pressing this key silences the audible alarm. Pressing
ALARM CLEAR
this key again enables the buzzer again
Table 4-5 Description of menu keys
Key F1
Function 1
HOME
Function 2
Liebert NXC 30kVA And 40kVA UPS User Manual
Meaning
Description
F2 F3 F4
ESC
Escape Left Right
Up Down
F5
Enter