Effect Of Power Failure - Tyco Galaxy SC Controller Manual

Effect of Power
Failure
7 - 55 Feature Descriptions
Tyco Electronics Galaxy SC Controller J85501F-1
date, plant voltage, and battery current, will be added to the Discharge
Statistics table.
The frequency at which entries are added to the log depends on the rate
of battery discharge. If a voltage reading differs by at least 250mV from
the previous entry (125mV for 24-volt plants), it will be recorded. If
voltage does not drop by the minimum valid, records will be made at
15-minute intervals. Thus, data points are spaced more closely together
in time during periods of rapid discharge, and are shown less frequently
during more stable periods when plant load is less and voltage is steady.
Once logging has begun, it will continue until the alarm is retired. At any
time, a super-user or administrator may clear the log. If the log is not
cleared, each new battery discharge charge alarm will continue with a
new series of entries, with the next higher series number.
Battery discharge statistics are limited to 120 entries. At the 121st
consecutive entry, the oldest occurrence will be lost and all others will
be moved up by one entry. The loss of the last entry may cause the series
numbers for the following discharges to go down by one number.
The battery on discharge statistics also contains the start date and time,
end date and time, duration and average load during the last discharge.
Loss of DC power to the Galaxy SC will affect computation of statistics
as follows:
Hourly Statistics: Hourly maximum or minimum value for an hour in
which power has failed will be the high or low reading between
restoration of power and the next change of hour.
The hourly average value will be the average of the readings between
restoration of power and the next change of hour.
If power fails more than once during an hour, only the last interval
between and the restoration and change of hour will be used.
If power failure lasts more than one hour, or if fewer than 10 readings
could be taken in the hour, the data for that hour will not be displayed.
If power failure lasts through the change of hour, data for the first hour
will not be displayed.
Issue 13 February 2001