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44 Operation
History Status
The History Status screen displays 64 frames, of 4 milliseconds each, from the Present Status screen. Note that
the values for output volts and amps are updated once each millisecond. Alarms are listed in the sequence they
occurred, within 1 millisecond resolution. The frames are stored in a buffer (a computer information storage
technique). The buffer stores the frames in a first-in first-out sequence. As a new frame enters the buffer the old-
est one is released.
When a designated fault occurs (see list below), the buffer stores information for t he next 24 frames and then
freezes (stops gathering information). At that time, the History Status screen contains 40 frames before the fault,
the frame when the fault occurred, and 23 frames after the fault. This 64-page report is a very useful diagnostic
tool for the operator or Liebert Global Services. Use the Up and Down pads to view the screens.
Figure 25 History Status Report Screens
OUTPU T VOLTS
OUTPUT AMPS
OUTPUT FREQUENCY
LOADKVA
BYPASS VOLTS
A
480
420
480
DC
B
480
420
480
TIMELOAD
349
C
480
420
480
HERTZ
60.0
NEXT FRAME
PREVIOUS FRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 04/10/97 16:49:21 FRAME 36
ORDER - 000000 SITE ID - 00000 SITE TAG - 0000000
**** ACTIVE ALARMS **** Output Ov-volts
OUTPUT VOLTS
OUTPUT AMPS
OUTPUT FREQUEN CY
LOAD KVA
BYPASS VOLTS
A
380
530
380
DC
B
380
530
380
TIMELOA D
349
C
380
530
380
HERTZ
50.0
NEXTFRAME
PREVIOUS FRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 04/10/97 16:49:21 FRAME 36
ORDER - 000000 SITE ID - 00000 SITE TAG - 0000000
**** A CTIVE ALARMS **** Output Ov-volts
OUTPUT VOLTS
OUTPUT AMPS
OUTPUT FREQUEN CY
OUTPUT VOLTS
OUTPUT AMPS
BATTERY VOLTS
OUTPUT VOLTS
OUPUT AMPS
BATTERY AMPS
INPUT VOLTS
INPUT AMPS
OUPUT VOLTS
OUTPUT AMPS
LOAD KVA
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
PREVIOUS FRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 01/17/98 11:21:59 FRAME 100
ORDER - 000000 SITE ID - 00000 SITE TAG - 0000000
**** ACTIVE AL ARMS **** Batt Discharging Low Batt Warning
DISCONTINUED
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