44 Operation

History Status

TheHistory Status screen displays 64 frames, of 4 millisecondseach, from the Present Status screen. Note that

thevalues for output volts and amps are updated once eachm illisecond.Alarms are listed in the sequence they

occurred,within 1 millisecond resolution. The frames are stored in a buffer (a computerinformation storage

technique).The buffer stores the frames in a first-in first-outsequence. As a new frame enters the buffer the old-

est one is released.

Whena designatedfault occurs (see list below), the buffer storesinformation for the next 24 frames and then

freezes(stops gathering information). At that time, the History Statusscreen contains 40 frames before the fault,

theframe when the fault occurred, and 23 frames after the fault. This 64-page report is a very usefuldiagnostic

toolfor the operator or Liebert Global Services. Use the Up andDown pads to view the screens.

Figure 25 History Status Report Screens

OUTPUTVOLTS
OUTPUTAMPS
OUTPUT FREQUENCY
LOADKVA
BYPASSVOLTS
A
480
420
480
DC
B
480
420
480
TIMELOAD
349
C
480
420
480
HERTZ
60.0
NEXTFRAME
PREVIOUSFRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 04/10/97 16:49:2 1 FRAME36
ORDER- 00 0000 SITE ID - 00000 SITETAG - 0000000
****ACTIVE ALARMS**** Output Ov-volts
OUTPUTVOLTS
OUTPUTAMPS
OUTPUT FREQUENCY
LOADKVA
BYPASSVOLTS
A
380
530
380
DC
B
380
530
380
TIMELOAD
349
C
380
530
380
HERTZ
50.0
NEXTFRAME
PREVIOUSFRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 04/10/97 1 6:49:21 FRAME36
ORDER- 00 0000 SITE ID - 00000 SITETAG - 0000000
****ACTIVE ALARMS *** * Output Ov-volts
OUTPUTVOLTS
OUTPUTAMPS
OUTPUT FREQUENCY
OUTPUTVOLTS
OUTPUTAMPS
BATTERYVOLTS
OUTPUTVOLTS
OUPUTAMPS
BATTERYAMPS
INPUTVOLTS
INPUTAMPS
OUPUTVOLTS
OUTPUTAMPS
LOADKVA
A
480
325
480
325
480
325
0
0
480
325
DC
390
-645
B
480
325
480
325
480
325
0
0
480
325
TIME
0:01
LOAD
270
C
480
325
480
325
480
325
0
0
480
325
HERTZ
60.0
NEXTFRAME
PREVIOUSFRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 01/17/98 11:21:59 FRAME 100
ORDER- 00 0000 SITE ID - 00000 SITETAG - 0000000
****ACTI VE ALARMS **** Batt Dis charging LowBatt Warni ng
DISCONTINUED
PROD U C T