Schumacher AUTOMATIC BATTERY CHARGER XC75 - Manual (Page 7)

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battery voltage. If you press the Charge Rate button again, the current will go back on at
the same setting it was when it was turned off. For example: The charger is charging a
battery at the slow charge rate setting. If you press the Charge Rate button, the output is
turned off. If you press the Charge Rate button again, the output will turn back on at the
slow charge rate setting.
OPERATING INSTRUCTIONS
11.
This battery charger must be properly assembled in accordance with
the assembly instructions before it is used.
Charging
Ensure that all of the charger components are in place and in good working 1.
condition, for example, the plastic boots on the battery clips.
Connect the battery following the precautions listed in sections 6 and 7.
2.
Connect the AC power following the precautions listed in section 8. Make sure to 3.
place the charger on a dry, non-flammable surface like metal or concrete.
Select the appropriate settings for your battery.
4.
Startup Defaults: When first turned on, the charger will default to the following startup settings:
Battery Type: Standard •
Charge Rate: OFF (No charge rate selected) •
After 10 minutes, if no charge rate is selected, the charger will automatically start
charging at the following defaults:
Charge Current: The lowest charge rate setting available, usually 2 amps. •
Charge Voltage: The lowest charge rate voltage available, usually 14.7 volts (Gel •
Cell), if not, then 15.4 volts (AGM), otherwise it will be 16.0 volts (Standard battery).
Battery Connection Indicator
If the charger does not detect a properly connected battery, the CONNECTED LED
will not light. Charging will not begin if the CONNECTED LED is not on.
Automatic Charging Mode
When an Automatic Charge is performed, the charger switches to the Maintain Mode
(see below) automatically after the battery is charged.
Aborted Charge
If charging cannot be completed normally, charging will abort. When charging aborts,
the charger’s output is shut off, all of the LEDs are turned off and the digital display
will show an error code (see Troubleshooting for a list of error codes). In that state, the
charger ignores all buttons. To reset after an aborted charge, unplug the charger.
Completion of Charge
Charge completion is indicated by the CHARGED LED . When lit, the charger has
switched to the Maintain Mode of operation.
Maintain Mode (Float-Mode Monitoring)
When the CHARGED LED is lit, the charger has started Maintain Mode. In this
mode, the charger keeps the battery fully charged by delivering a small current when
necessary. The voltage is maintained at a level determined by the BATTERY TYPE
selected. If the charger has to provide its maximum maintain current for a continuous
12 hour period, it will go into Abort Mode (see Aborted Charge section). This is usually
caused by a drain on the battery, or the battery could be bad. Make sure there are
no loads on the battery. If there are, remove them. If there are none, have the battery
checked or replaced.
NOTE: For 12V AGM and 12V GEL CELL battery types, the CHARGED LED might
be lit before the Maintain Mode starts.
Maintaining a Battery (3A
Charge Rate)
The Schumacher XC75 and XC103 are battery chargers with a maintenance setting that
maintains both 6 and 12 volt batteries, keeping them at full charge. On this setting, it can
charge small batteries and maintain both small and large batteries. If you are maintaining
a fully charged large battery, you will properly utilize the maintenance setting. However, if
you use the maintenance setting to charge a large battery, such as a marine deep cycle
battery, that was not fully charged, you may lose some of the battery’s capacity. This would