OnLine Power Battery Backup System - Manual (Page 24)

OLP
Three Phase UPS Systems
1. SYSTEM OVERVIEW
1-20
The front panel is located at the front of the PCB holder. It gathers the real time
information of the UPS and shows them clearly to the user. It also provides switches
for controlling and setting the UPS. Through this panel, the UPS can be not only a
stand alone machine supplying the load, but also closely monitored by the user. Each
part of the panel is explained below.
A: LCD display: Real time status, data or historical events are displayed on the LCD.
The UPS parameters, real time clock, inverter, and buzzer also can be set through
this LCD. The LCD is back-lighted by LEDs to provide a sharp display. In order
to lengthen the LED’s life time, the LED are automatically shut off 3 minutes
after no key is activated, but will light up again when one of the up/down/enter
key is pushed.
B: Status LEDs: 24 LEDs, representing all of the important information of the UPS,
provide the most up to date information to the user. Therefore these LEDs are
especially important when abnormal conditions occur. The 24 information items
are as shown below:
INVERTER ON – inverter is running.
INVERTER SS – inverter static switch conducts while the reserve static
switch is opened.
SHORT CIRCUIT – UPS output is in short circuit state.
FUSE/OVER TEMP SD – inverter shutdown due to either fuse broken or
over temperature condition.
INVERTER FAIL SHUTDOWN – inverter shutdown due to inverter output
voltage too low.
BYPASS ON SHUTDOWN – inverter shutdown due to bypass breaker being
closed while the inverter is running.
HIGH DC SHUTDOWN – inverter shutdown due to overly high DC bus
voltage condition while the inverter is running.
OVERLOAD SHUTDOWN – inverter shutdown due to overload of the
inverter for a period over that which the inverter can endure; will restart 7
seconds after overload removed.
70% LOAD – load connected to the output is at or over 70% of the UPS
rating.