Tyco Galaxy SC Controller User Manual

Tyco Electronics Galaxy SC Controller J85501F-1
Appendix G - 2 Glossary Issue 13 February 2001
service. A failure can be service affecting according to one or both
definitions. (See BellCore TR-TSY-000474.)
Plant Voltage Float voltage is the continuous, long-term constant voltage of the plant
that maintains battery cells in a fully charged condition. Refer to the
battery product manual for the battery cell float voltage level. The float
voltage level is set by the rectifier float voltage set point. The controller
refers to this output level as the float mode.
Boost mode is the rapid recharge of all the battery strings. The boost
voltage set point is typically 0.15 volts per 2 volt cell higher than the
float voltage set point. Thus, for 48 volt plants, the boost voltage set
point is 3.6 volts higher than the float set point. For 24 volt plants, the
boost voltage set point is 1.8 volts higher than the float set point. Some
rectifiers refer to this form of recharge as equalize. This form of
recharge is usually done on non-valve regulated lead acid batteries.
Refer to the battery product manual for the recommended boost voltage
set point.
Note: the boost voltage must be within the operational range of the load.
Battery Thermal Protection Mode (BTP) may be used to prevent
thermal run away on valve regulated lead acid batteries. For 48 volt
plants, the BTP voltage set point is typically 2 volts less than the float
voltage setting. For 24 volt plants, the BTP voltage set point is typically
1 volt less than the float voltage setting.
The Galaxy SC supports two plant modes, float and either BTP or boost
mode. While in boost or BTP mode, the energy management algorithm
is temporarily disabled.
In all modes, the plant voltage is monitored for trouble indications. The
following alarms and event conditions are associated with the plant
voltage “Very Low Voltage,” “Battery on Discharge,” “High Float
Voltage,” “High Voltage Shutdown,” and the “Rectifier On” Threshold.
Battery On
Discharge
If rectifier output is insufficient to supply the load current for any reason
(such as an AC power failure), the battery reserve will provide the
necessary current. Such a battery discharge can be detected by a drop in
the plant bus voltage. Whenever the plant voltage drops below a
pre-selected threshold, the controller issues a Battery on Discharge
alarm (BD). This alarm threshold is typically set to indicate the onset of
battery discharge, in order to allow enough time for maintenance
personnel to respond before battery reserve is exhausted. When a BD
alarm occurs, service is not usually affected immediately. However,

Tyco Galaxy SC Controller Specifications

General

Brand	Tyco
Model	Galaxy SC Controller
Category	Controller
Language	English