Operation; A) Three Stage Charge Regimen - NewMar Phase Three PT-7 Installation & Operation Manual

descriptions as "gel-cell" or "lead-acid". You are advised to consult the manufacturer of
your particular battery as to proper charging regimen, and use the battery type selection
switch setting which most closely conforms to the recommended voltages.
See the SPECIFICATIONS section for the actual preset charge and float voltages for
each model.
IV)

OPERATION

A) Three Stage Charge Regimen

The Phase Three Battery Charger utilizes the three stage charge regimen which is
widely recommended by battery manufacturers for allowing the fastest possible recharge
time without loss of batteries' electrolyte (gel or liquid) which may be caused by sus-
tained charging at higher voltages.
This three stage regimen is initiated each time a.c. is first applied, when drained batter-
ies are most likely to be encountered, and proceeds slowly or quickly through each stage
depending on the battery's relative state of charge.
Note: The Charge Cycle Select switch on the front panel must be in the "Charge" position for the
three stage cycle to occur. In the "Float" position, the charger will have a fixed output voltage which
depends on the setting of the Battery Type Selector. (See Specifications section for output volt-
ages. See also the warning about the switch setting at the end of this section.)
During the first two stages (referred to collectively as the "Charge" stage) the indicator
light on the front panel will glow red. When charging is complete and the charger has
switched to the "Float" stage, the indicator will glow green.
The charge regimen proceeds as follows:
1) Bulk Phase: When batteries are significantly discharged the charger responds ini-
tially by delivering a high amount of d.c. current, at or near the charger's maximum
rated output, in order to rapidly replenish them. It is during this stage that charging
current is maintained at a high level as battery voltage increases. Bulk charging contin-
ues until battery voltage reaches the "charge" voltage level (where batteries are at about
75-80% of capacity). At this point the charger switches to the second stage.
2) Absorption Phase: During this second stage of the charge cycle, battery voltage is
maintained at the "charge" voltage level. Output current begins to taper off as the bat-
tery plates become saturated. Charge voltage is maintained until the current sensing
circuit detects that output current has tapered to about 5-15 % of charger rating. At this
point the batteries are at about 95 % of full charge and the Phase Three charger
switches to the third and final stage of the charge cycle.
3) Float Phase: For extended battery life the Phase Three then automatically switches
to a lower float voltage level. This float charge keeps batteries at peak condition without
9
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