EnerSys Alpha FXM HP 1100, Technical Manual

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0170022-J0 Rev A Page 65
Figure 55: Temperature Compensation Voltage Graph
Battery performance and life expectancy are directly related to the battery ambient temperature.
Thermal runaway occurs if the internal temperature rises due to overcharge, high ambient temperature
or internal fault. Temp Comp automatically adjusts the float voltage as the battery temperature changes
to protect the battery from thermal runaway.
The Temp Comp function adjusts the system voltage every two seconds, as the temperature changes,
and provides for a maximum voltage change of 0.1V over this interval. Temp Comp occurs at standard
rates commonly referred to as slope-compensation settings.
The slope of the Temp Comp curve in either mV/°F/Cell or mV/°C/Cell can be set via the
System >
System Functions > Temperature Compensation . The value is set based on the battery manufac -
turer’s information.
If the battery temperature probes appear to be disconnected or broken, then the Temp Comp function
calculates the enabled setpoints as if the temperature reached the Upper Temperature Breakpoint.
9.2.4 Battery Test
Battery test is used to determine the Estimated State of Health of the battery by discharging it to a
certain state.
Definitions
• Battery Test Termination Voltage — The voltage threshold at which the test normally ends.
• Battery Test Timeout — The maximum time the test can run before it is stopped.
• Battery Test Alarm — The battery test is active.
There are three ways to start a battery test:
• Manual Battery Testing — Battery Test can be started by clicking in the Start Manual Battery Test
button.
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Temperature Compensation
Battery Voltage Curve
V
oltage (V)
Temperature (°C)
Upper Temperature Breakpoint
Lower Temperature Breakpoint