40 Operation
3.1.3 Walk-In DisplayScreen
Fromthe module Master Menu, highlight WALK-IN DISPLAY and thenpress the Select pad. Note that this
screenis displayed at the UPS modules but is not required at the System ControlC abinet(SCC).
Figure 21 Walk-In Display Screen During Start-Up
TheWalk-In Display screen enablesthe operator to monitor the UPS module DC bus voltage,the input currents,
andthe output voltage. This is important during the start-up procedures.
Duringstart-up, the UPS module input circuit breaker is closed and power is applied to the UPS module. The
Walk-InDisplay screen graphically shows thevoltage increasing on the DC bus as the UPS module rectifier
beginsto walk-in.
The DC Volt s bargradually moves to the right. After the DC Vo lts bar reaches the 90% level, the UPS module
inverterstarts-up and the Output Volts bar also moves to theright. Both the DC Vo lts and the Output Volts
barsshould settle near the 100% line as the UPS module becomes fullyenergized.
The three Input Amps bars (one for each phase ofinput current) move to the right during the initialtransformer
inrush.They should return to the left after themomentary inrush has subsided, then increaseto about 10% as the
DCVolts increase.
Modulesequipped with the optional input filter will indicatemore than 10% with no connected load.
NOTE
Afterthe critical load is transferredfrom the bypass line to the UPS modules, the
InputAmps bars continue to indicate the percent of the designinput current to the
UPSmodule rectifier.
Ifany Input Amps bar differs from the average bar lengthby more than 10%, call
LiebertGlobal Services.
DOWN :
SELECT :
MASTERMENU
SELECT :
0% 25% 50% 75% 100%
INPUTAMPS
OUTPUTVOLTS
D.C.VOLTS
DISCONTINUED
PROD U C T