B) Time-Out Circuit - NewMar Phase Three PT-70a Installation & Operation Manual

FIGURE 4: Typical Charger Output Graph (into battery without load)
*
* Approximately 10 hours maximum at factory setting.
Note: If a load is applied during the absorption phase, the charger may revert to the bulk phase
depending on the total current draw. When the charger switches to the float phase, it will
remain in that phase regardless of current draw. The charger is still able to deliver full output
current when in the float phase. To re-initialize the three stage process shut the charger off
momentarily, then back on again (or press the reinitialize button on the optional remote panel)

B) Time-Out Circuit

Batteries have a tendency to lose their electrolyte and may be damaged if they are main-
tained for long periods of time in the elevated voltage of the absorption phase. Therefore, the
Phase Three Charger employs a special time-out circuit. This circuit is initialized each time
a.c is first applied to the charger (or when the reinitialize button on the optional remote
panel is activated) and runs for a pre-set interval before forcing the charger to go into the
float (lower voltage) mode. The functioning of the charger during this interval is as follows:
If the current demand of the batteries/load falls below 5-15 % of the charger's output capac-
ity prior to the circuit timing-out, the charger will automatically switch to the float mode. If
demand rises to about 10-20 % of charger output capacity, it will return to the elevated
output voltage of the absorption phase. This switching back and forth between modes may
occur until the circuit times-out (8-10 hours after a.c. is first applied), after which the
charger will remain at float voltage, until the circuit is re-initialized, either by turning the
charger off and then on again or by presssing the re-initialize button on the optional remote
panel.
Installation Note: The time-out circuit of the PT charger has been set at about 8-10 hours,
which is appropriate for battery systems within the capacity range specified on the front
panel of the charger. If the charger is used with a battery system with a capacity near (or
outside) the upper or lower ranges of the specified range of the charger, adjustment of the
internally located time-out circuit adjustment pot may be recommended. The procedure is as
follows:
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