Liebert 610 manual History Status, History status report screen

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 (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

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
	A	B	C	DC	LOAD	HERTZ TIME
OUTPUT VOLTS	480	480	480
OUTPUT AMPS	325	325	325
OUTPUT FREQUENCY	480	480	480			60.0
OUTPUT VOLTS
OUTPUT AMPS	325	325	325	390			0:01
BATTERY VOLTS	480	480	480
OUTPUT VOLTS
OUPUT AMPS	325	325	325	-645
BATTERY AMPS	0	0	0
INPUT VOLTS
INPUT AMPS	0	0	0
						UP	: NEXT FRAME
OUPUT VOLTS	480	480	480
						DOWN : PREVIOUS FRAME
OUTPUT AMPS	325	325	325		270
LOAD KVA
						SELECT : EXIT

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.

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).

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).

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