Xantrex Technology TC10TB - Manual (Page 16)

Truecharge 10TB Owner’s Manual
13
5.0 Operation
5.1 Automatic Charging Sequence
1. When AC power is first switched on, an initialization procedure begins.
The microprocessor checks for excessive voltage at the battery. It then
checks to ensure the internal charger temperature is not greater than
175°F (80°C). If both these conditions are met, and the battery voltage
is lower than the “absorption” voltage (see step 4), the Truecharge
begins “bulk” charging, delivering a full charge to the battery or batteries.
During this charging phase, the majority, or bulk of the charge is returned
to the battery.
2. After approximately 10 seconds, the microprocessor rechecks battery
voltage, to determine if the battery is responding to being charged. If
the battery is not responding, charging is terminated and the initialization
procedure in step 1 is restarted.
3. If the battery is responding, bulk charging at a full 10 amps continues
until the battery voltage rises to just below the point where destructive
battery “gassing” can begin. When this threshold is reached, typically
14.2 to 14.4 volts, depending on battery type and position of the battery
selector switch, the Truecharge enters its absorption charge mode.
4. When the battery voltage under full bulk charge approaches the point
where battery “gassing” can begin, the Truecharge switches over to
“absorption” mode. During this final charging phase, current is
progressively reduced to hold the battery voltage absolutely constant
at 14.2 to 14.4 volts (depending on battery type selected).
5. When charging current drops below 1 amp, this signals that the battery
is fully charged. If a Gel or AGM battery type is being charged, the
Truecharge now switches immediately into its “float” charge mode. If
the battery being charged is a Flooded type, the Truecharge continues
the absorption charge mode for one additional hour, then switches into
float charge mode.
6. Once in float charge mode, the Truecharge reduces its charging voltage
to the precision-controlled “float” voltage value. This maintains the
battery indefinitely at 100% charge, yet creates negligible gassing or
electrolyte loss.
7. If the microprocessor detects the charger has been in absorption mode
for more than 8 hours, it automatically switches into float mode. This
feature protects the battery against situations where a light load
connected to the battery prevents the charger current from dropping