Service manual

Always On UPS Systems Inc
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14. THE LCD DISPLAY
The LCD displays Real Time information as to the status and operation characteristics of the UPS
system and battery banks. In order to make the display sharp and readable, the LCD is back-lit by
LED’s. To prolong the life of the LED, the CPU will cut off the power of the LED 3 minutes after
the last key has been pressed. The backlight will illuminate whenever a key has been pressed. This
screen will pop up once the system power is enabled (i.e. the default screen).
14.1. Menu 0 – Main Menu
The first row will display the greeting content set by the factory. The model no. (MODEL), serial
no. (S/N), and the identification no. (ID) are displayed in the second row. The third row will
display the kVA rating, input rating and output rating of the UPS.
The serial no. is set by the factory for the convenience of maintenance personnel who may need
to refer to the serial number for the correct spare parts and testing procedures. The identification
no. is set only when multiple UPS systems are connected in parallel. Each UPS must have a
unique number to identify itself, and will be set by a factory trained technician after installation.
The YEAR/MONTH/DATE, DAY OF THE WEEK, HOUR, MINUTE and AM/PM from the
real time clock inside the UPS are displayed in the fourth row for user’s reference and for
stamping the date and time in the historical data when an abnormal conditions occurs. By
pressing one of the UP(↑), DOWN(↓) or ENTER(↵) keys, the LCD will change to another
screen.
W E L C O M E T O A L WA Y S O N U P S S Y S T E M S I N C
M O D E L : N
X
- S E R I E S S / N : 3 4 5 6 7 8 9 0 I D : 0 1
5 0 K V A I : 1 2 0 2 0 8 V 6 0 H Z O : 1 2 0 2 0 8 V 6 0 H Z
2 0 0 2 0 2 0 1 T U E 0 8 : 0 0 A
M
Figure 14.1.1
M
ain Menu Dis
p
la
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