Tyco Electronics Galaxy SC Controller J85501F-1
Issue 13 February 2001 Feature Descriptions 7 - 66
End Volts per Cell:
The plant voltage, normalized on a per cell basis, which the user chooses
for calculating the reserve time. The default value is 1.75 volts. The
range of values for this setting is 1.75 to 1.95 volts. The predicted
reserve time will vary significantly as the end cell voltage changes from
1.75 to 1.95.
Battery Type:
The reserve time prediction algorithm is based on a modeling technique
that is adaptive for different types of batteries. The batteries currently
supported are listed above. The default value is the Tyco Electronics
KS-20472, L-1S battery.
Number of Battery Strings:
The reserve time is adjusted to reflect the number of battery strings and
the actual plant load. The range is 1 to 32 strings, with the default setting
of 2 strings.
Cells Per String:
The algorithm must know the number of cells per string. Dividing by the
number of cells per string normalizes the plant voltage (or battery
voltage). The program allows 1 to 75 cells per string. For 24-volt plants,
the default number of cells per string is 12. For 48-volt plants, the
default number of cells per string is 24.
Rectifier Float Set Point:
During discharges, the reserve time is normalized for a constant power
discharge using the rectifier float set point. For 24-volt systems, the
default rectifier float set point is 26.04 volts. For 48-volt systems, the
default value is 52.08 volts.
Reserve Time Too Low Alarm Threshold:
The Reserve Time Too Low alarm is created during a battery on
discharge when the predicted reserve time drops below this configurable
threshold value (in hours). The default value is 2 hours. The alarm is
cleared when the batteries recharge. If the universal battery temperature
probe is removed, which should never happen, the alarm is cleared.
The alarm can also occur if the plant load increases so that the calculated
reserve time with fully charged batteries is less than two hours. This
occurs if the battery capacity exceeds C/2. For this case, the alarm can
be removed by configuring the alarm threshold to zero.
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