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mately 3 amps, the charger will remain in the charge mode (unless the Charge Cycle
Select switch is put into the "Float" position).
C) Constant Versus Occasional Use
In general, it is recommended that the charger be left connected continuously to the a.c.
distribution system so that it will be in operation whenever a.c. is available. This will
maintain batteries at peak voltage and will automatically compensate for the natural
self-discharge of the battery system. When a load is applied to the battery system the
charger's output will automatically increase to supply the current which would otherwise
draw battery voltage down. Repeatedly allowing batteries to become completely dis-
charged before recharging will greatly shorten their life. Leaving the charger on
continuously will prevent this.
While the output regulation of the charger will minimize battery gassing and water loss,
monthly checks of the electrolyte level (for wet lead acid batteries) are still strongly
recommended. Some water loss is an inevitable aspect of the charging process, and
maintaining the correct electrolyte level in your batteries is the most important thing
you can do to assure their maximum performance and long life.
D) Proper Load Sizing
The PT-7 is rated for continuous duty at 7 amps. While the charger cannot be damaged
by overloads that exceed this continuous rating, excessive load demands may draw
battery voltage down faster than the charger can resupply it. If battery voltage continues
to drop and the output current is at maximum while the charger is in service, check to
see that your average d.c. loads are not exceeding the charger's rated output.
E) Operation With Engine
It is perfectly acceptable to allow the charger to remain on when the engine is started
and while it is running. The current limit feature of the Phase Three Charger will pro-
tect against any damage due to the high current demands of engine cranking. Output
diodes will prevent any back-feed of current into the charger from the alternator while
the engine runs.
As the alternator starts to charge the battery, the charger output will decrease. When
the battery voltage exceeds the rated output voltage of the charger it will shut off and
stay off as long as the batteries are in this high state of charge. If the battery voltage
should drop below the charger's rated output voltage it will automatically return to ser-
vice.
E) Operation as a d.c. Power Supply (stand-alone d.c. power source)
Most battery chargers are not suitable for powering electronic devices directly, without a
battery attached to the output, as the high ripple and pulsing d.c output ( i.e., rectified
a.c. output) can interfere with the operation of the device. However, the PT-7 employs a
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U.S.A. HEADQUARTERS
EURO WAREHOUSE
E
P
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LECTRONIC
OWER
RODUCTS
P.O. Box 1306, Newport Beach, CA 92663
Phone:+31-35-603-2494
C
! ! ! ! !
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Phone: 714-751-0488 Fax: 714-957-1621
OMMUNICATION
AVIGATION
Fax:+31-35-603-2149
E-Mail: sales@newmarpower.com
www.newmarpower.com
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