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limit feature of the Phase Three Charger will protect 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 cease charging and will have no
output 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 service.
D) Cooling Fans
To maximize the life of the internal components and to allow
continuous operation at full rating, the Phase Three charger
employs multiple integral cooling fans. Both variable speed and
thermally cycling fans are used. Whenever load and/or ambient
temperature cause a significant rise in the internal temperature,
these fans will adjust automatically or cycle on and off, as
necessary, to cool components, extending their operating life.
Under no load and cool ambient temperature no fan movement
may be detected, but this does not indicate fan failure. Increased
load and/or rising ambient temperature should cause fan
activation.
VI) TROUBLESHOOTING
Note 1: The Phase Three charger incorporates a self-contained A.C. to D.C. conversion module. This module houses several automatic
protection circuits, as well as the A.C. input and D.C. output fuses to protect internal wiring. Under most circumstances these fuses will
fail only if the charger has an internal fault. They are not user-replaceable. The following section deals primarily with the charger's
protection features (some requiring manual charger reset; others auto-resetting). If an apparent charger fault cannot be corrected using
any of the recommendations in this section, the charger should be returned to the factory or place of purchase for inspection and repair
or replacement.
Note 2: Certain charger or battery problems are self-diagnosing with the Phase Three charger. For any shutdown condition which has
caused the charger's Status Indicator to signal with one or more Red L.E.D. "Flash/Beeps" or Yellow Flashes, refer to section IV-C Status
Indicators to diagnose and resolve the problem.
Condition
A) Status Indicator show charger
has shifted into float stage but
batteries are not coming up to
full charge.
B) Charger continues to charge
at 3 amps or more – does not
taper back into charge
13
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Possible Cause
1) High-rate time-out circuit has activated,
but extremely discharged batteries requiring
longer recharge time.
2) Charger limiting its output due to
overload.
3) Charger output is not properly connected
to batteries.
1) D.C. load drawing current from batteries
(not a problem condition).
2) Bad cell in one of the batteries to which
charger is connected.
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No lubrication or maintenance is required. Simply ensure that there
is a free flow of air around the charger (approximately 2 or more
inches around all sides) and that there is no debris clogging the
ventilation perforations in the charger chassis.
E) Current Limit Circuit
The Phase Three Charger is self-limiting and protected against
overloads by a fast-acting current limit circuit which automatically
reduces output voltage to protect the charger when a current
demand is encountered which exceeds the charger's power limit
rating. This may be due to extremely discharged batteries which
are beyond the recommended amp-hour rating, or a large D.C.
load being applied while batteries are heavily discharged, for
instance. (See SPECIFICATIONS section for maximum power limited
amps and recommended battery capacity ratings.) If a check of
the output voltage is taken when the charger is under this extreme
current draw, it may measure only a fraction of normal output
voltage. This is a normal function of the current limit circuit. To
check proper charger operation, simply remove the overload and
observe that normal output voltage has automatically resumed.
Important Note: The current limit circuit will not protect the
charger against a dead short across the (+) and (-) output
terminals when the charger is turned on. Charger failure will
result.
Solution
1) Turn off all D.C. loads and allow charger 24-
48 hours to recharge batteries. See section IV-B for
explanation of time-out circuit.
2) Reduce D.C. load.
3) Refer to D.C. wiring section of this manual and
verify compliance with instructions and diagrams
1) To confirm charger will output minimal amperage
to fully charged batteries, shut off all D.C. loads
or turn off main battery switch to D.C. distribution
panel.
2) Check for shorted cell in all flooded type batteries
– see Battery Care Tips section. Refer to manufacturer
for testing maintenance-free batteries.
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