Filter
Top Products
Operation
29
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 (FIFO)
sequence. As a new frame enters the buffer the oldest one is released.
When a designated fault occurs (see list below), the buffer stores information for the 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 16 History status report screen
The alarm conditions that cause the History Status buffer to store and freeze data are:
Auto Transfer to Bypass
DC Cap Fuse Blown
DC Overvoltage Shutdown
Inverter Fault
Low Battery Shutdown
Output Overvoltage
Output Undervoltage
Overload Transfer
Overtemperature Time-out
Rectifier Fuse Blown
Reverse Power
For a complete list of all the alarm messages and corrective action to these faults, refer to Table 4.
The History Status buffer does not resume collecting new frames until the fault is cleared and the
Alarm Reset pad is pressed for more than 5 seconds (or until the screen clears).
NOTE
The Emergency Off and Hardware Shutdown alarms will also freeze the History Status buffer
with the Auto Transfer to Bypass alarm (if the load is on the UPS system when the alarm
condition occurs).
OUTPUT VOLTS
OUTPUT AMPS
OUTPUT FREQUENCY
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
NEXT FRAME
PREVIOUS FRAME
EXIT
UP :
DOWN :
SELECT :
HISTORY STATUS MODULE-0 01/17/96 11:21:59 FRAME 100
ORDER - 000000 SITE ID - 00000 SITE TAG - 0000000
**** ACTIVE ALARMS **** Batt Discharging Low Batt Warning