Service manual

Always On UPS Systems Inc

The front panel is located behind the glass window on the front door. It displays the real time

information, UPS Status, battery system and provides the user interface for controlling and

setting the UPS operating parameters. This panel is user friendly. Each part of the panel is

explained below:

A: LCD display- Real time status, data and historical events are displayed on the LCD. The

UPS parameters, real time clock, inverter, and buzzer can also be set through

this LCD. The LCD is back lit by LED’s for a sharper display, but in order to

lengthen the LED’s life time, the LED will automatically shut off 3 minutes

after a key has been pressed, and will light up again when one of the

up/down/enter keys are pushed.

B: Warning LED’s-When an abnormal condition occurs, these LED’s will illuminate allowing

the user to identify the cause of the fault. This will also allow the service

personnel the ability to initially troubleshoot the system. These LED’s are

described below:

• RECT AC FAIL – supply to the rectifier is outside of the operating window.

This is related to the supply voltage out of range, the phase rotation is

incorrect or the rectifier has been shutdown (refer to C: Status LED’s).

• RESERVE FAIL – supply to the reserve is outside of the operating window.

This is related to the supply voltage out of range or frequency out of range

(refer to C: Status LED’s).

• FUSE/TEMP – inverter has shutdown due to inverter fuse open or heat sink

temperature above operating parameters.

• OVERLOAD – an overload condition has occurred on the output.

• HIGH DC – the DC voltage has exceeded maximum operating level (over

430VDC). The bus voltage is limited to this voltage.

• BAT LOW – this LED will be lit as long as the DC voltage is lower than

320VDC.

• BAT LOW STOP – the LED will be lit as long as the DC voltage is lower

than 295VDC. The inverter will not activate until the DC voltage is above

this level.

• FAULT – the inverter has shutdown because an abnormal condition has

occurred. Possible conditions include overload, short circuit, high DC

shutdown, fuse/over temperature, bypass breaker on or emergency stop (refer

to C: Status LED’s).

C: Status LED’s- 24 LED’s represent the real-time information about the status of the UPS

system. These LED’s will aid in diagnosing and trouble shooting abnormal

conditions. The 24 LED’s represent the following:

• INVERTER ON – inverter is running.

• INVERTER SS – inverter static switch is active.