NewMar PT-24-20W Installation & Operation Manual page 13

Condition
A) Batteries are not coming up
to full charge
B) Charger continues to charge
at 3 amps or more – does not
taper back into charge
C) Charger does not charge.
D) Charger repeatedly blows
input fuse with no batteries
connected.
E) Reverse polarity connection
to charger has caused charger
to stop charging.
F) High output voltage
measured across charger
output terminals.
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P.O. Box 1306, Newport Beach, California 92663 • Phone: 714-751-0488 • Fax: 714-957-1621 • E-Mail: techservice@newmarpower.com
Possible Cause
1) Extremely discharged batteries requiring
long recharge time.
2) Charger limiting its output due to overload
or over temperature conditions.
3) Fan not operating properly causing
charger to protect against over-heating by
reducing power.
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.
1) Blown input fuse.
2) Charger is not receiving AC input voltage
or is not receiving correct AC input voltage.
3) Charger output is not properly connected
to batteries.
4) Blown output fuse.
5) Defective charger.
Internal Short.
DC Output fuse and possibly
other components blown.
1) Batteries not connected to charger. It is
normal to read volt higher across any output
bank when no batteries are connected.
2) Equalize time function activated.
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Routine Checks and Maintenance
Solution
Batteries should periodically be "exercised" (slowly discharged and
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 and/or determine cause of over
temperature state (See section III-B, "Location").
3) Replace fans if necessary.
1) Turn off main battery switch to DC electrical panel
or turn off all DC loads if you wish to confirm charger
will output minimal amperage to fully charge
batteries.
2) Check for shorted cell in all wet lead-acid batteries
using a hydrometer. Replace battery if cell is shorted.
Refer to manufacturer for testing maintenance-free
batteries.
1) Replace fuse with another of correct value. Check
to see if AC input select switch is in proper position.
Check to see if input fuse value is correct for
input AC voltage.
2) Using a voltmeter, confirm, AC input voltage,
check input connections. Confirm AC input
select switch is in correct position or correct AC
connector/adapter is installed.
3) Refer to DC wiring installation diagram for proper
connections to batteries.
4) Replace with another of correct value (see section
III-D, "DC Output Wiring").
5) Return for analysis/repair by servicing dealer
where charger was purchased or contact
NEWMAR for a Return Materials Authorization
number.
Same as above.
Replace output fuse with another of correct value.
If fuse again blows, return to servicing dealer or
contact NEWMAR for Return Materials Authorization.
1) Check for tight connection of charging leads from
charger to batteries.
2) Check to verify proper installation and operation of
equalize timer.