Tyco Galaxy SC Controller User Manual

Tyco Electronics Galaxy SC Controller J85501F-1
7 - 63 Feature Descriptions Issue 13 February 2001
based on the manufacturer’s data for the particular type of battery, the
minimum allowable cell voltage, the temperature, and the load. Since
the manufacturer’s data are based on a fully charged battery, the initial
prediction will be accurate only if the battery is fully charged.
When the ac fails and the batteries begin to discharge, during the initial
portion of the discharge, known has as the Coup De Fouet, the predictor
continuously subtracts the ampere hours that are being removed from
the battery from the reserve time predicted before the start of the
discharge. The Coup De Fouet time period varies with the rate of
discharge and begins when the battery starts to discharge. The Coup De
Fouet time period is calculated as approximately 5 percent of the
projected discharge time, and is typically 1 minute to 15 minutes.
After the Coup De Fouet, the prediction is based on a Tyco patented
prediction algorithm. In essence, the algorithm “learns” the
characteristics of the particular battery string(s), then uses the learned
characteristics for future predictions rather than using the
manufacturer’s data as was used for the initial prediction.
When the ac returns, and the battery begins to charge, the reserve time
prediction is continuously updated as ampere-hours are added into the
battery. If there is not a subsequent battery on discharge before the
battery is fully charged, when the battery is fully charged the reserve
time prediction for the plant will be based on the learned battery
characteristics. With the plant now in the float mode, the algorithm then
uses the learned battery characteristics for subsequent predictions.
Recall that the initial prediction was based on battery manufacturer’s
data.
If there are subsequent ac failures before the batteries are fully
recharged, the prediction is updated by subtracting the ampere-hours
removed during the discharge and adding ampere hours during charge.
Note that a prediction is always made, regardless of the load, number of
ac failures, and changes in the load. Eventually the batteries will be fully
charged and in the float mode. With the plant in the float mode, the
algorithm uses the learned battery characteristics for subsequent
predictions.
The total reserve time for the discharge is also stored in the plant Battery
On Discharge history. The reserve times included in the Battery On
Discharge history can be used as one of the criteria for determining
when to check or replace the batteries in the plant.
If the predicted reserve time drops below a user configurable threshold,
with a default value of 2 hours, then the Reserve Time Too Low alarm

Tyco Galaxy SC Controller Specifications

General

Brand	Tyco
Model	Galaxy SC Controller
Category	Controller
Language	English