Power-Sonic PSC-124000A - Manual (Page 4)

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conditions. For this feature to work properly, the battery and charger should be located in the same
environment (allow the battery and charger to stabilize at room temperature before charging).
Initially, the charger open circuit voltage may read a little high until its internal temperature warms
during operation, thereby lowering the voltage.
Make sure that you only charge a battery with the same nominal voltage rating as the charger.
Charging a lower voltage battery will cause battery damage due to severe overcharging. Charging a
higher voltage battery may damage the charger due to overheating.
These battery chargers are designed to ideally charge a battery at the C/10 rate (capacity divided by
10 hours). Therefore, a 40 amp-hour battery would require a 4 Amp charge. Larger or smaller capacity
batteries can be charged with these chargers with the following precautions (refer to these charger
specifications and your battery documentation for proper switch and charge currents to determine
compatibility with this charger). When charging a larger capacity battery, the battery may be over-
charged due to the unit not switching into float charge mode. Holding a battery for prolonged times
at the high rate charge voltage may damage the battery. Larger capacity batteries really require a
Larger current charger or a float charger.
When charging a smaller capacity battery, the battery may be undercharged because the charger
switches into float charge mode too early (relative to capacity). Leave the battery to the charger for
several hours to finish charging in the float charge mode.
TROUBLESHOOTING
NO INDICATOR LIGHT - If the indicator light is dark, check the fuse and replace if necessary. If the fuse
is good, check the voltage switch setting and input power (is the receptacle controlled by a light
switch?). If all else appears normal then the charger probably needs repair.
NO CHARGE INDICATOR, NOT CHARGING - If the charger will not go into charge mode (yellow indica-
tor) then the battery is probably already charged. Try again with another battery which you know is
not charged.
FAULT INDICATOR - If the indicator light is red then either the outputs are hooked up in reverse or
shorted together. Make sure of the connection to the battery. Note: A nearly completely dead battery
(less than one volt) looks like a short to the charger. If you suspect the battery is dead, leave the
charger on the battery to see if it will go into charge mode. The charger will deliver a small amount of
current into a dead battery and may eventually go into normal charge mode and recover the battery.
If the charger will not go into charge mode within one hour, and then into float mode within 24 hours,
the battery is probably damaged beyond recovery.
CHARGER WILL NOT SWITCH INTO FLOAT MODE - If the charger will not switch into the float mode,
after 24 hours, then the battery is probably damaged and is not properly accepting the charge.
MAINTENANCE INSTRUCTIONS
FUSE REPLACEMENT - The AC input module contains the main fuse and a spare fuse. Detach the