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charger, it is highly unlikely that this fuse will blow unless there is some other malfunc-
tion within the charger. This fuse is not user-replaceable. Replacement of the input fuse
must be performed by a qualified service person.
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. (This also occurs when the
reinitialize button on the optional remote panel is activated; see Remote Panel Option
section for more information). Note: An audible "clicking" noise from an internal relay may be
heard when the charger switches from one phase to another. This is normal operation. 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). A current limit circuit prevents charger overload during this maxi-
mum output stage. 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.
* Note: The absorption phase may also be ended by the time-out circuit. See section B
following for a complete explanation of the purpose and functioning of the time-out cir-
cuit.
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
overcharging. The charger may be left in this stage for lengthy periods of time without
attention (though periodic checks of electrolyte level in flooded batteries is recom-
mended). It is not necessary or recommended to shut the charger off when this stage is
reached.
1 0
P.O. Box 1306
Newport Beach,
California 92663
www.newmarpower.com
Phone: 714-751-0488
Fax: 714-957-1621
E-Mail: sales@newmarpower.com
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