Schumacher SC-7500A Using your battery charger, Engine Starting Notes, Overview

up to 5 seconds or until the engine cranking stops. The digital display shows a countdown of the remaining crank time in seconds. It starts at 5 and counts down to 0.

3.Cool Down - After cranking, the char- ger enters a mandatory 3-minute (180 second) cool down state. During this period, no settings can be changed. The buttons are ignored. The digital display indicates the remaining cool down time in seconds. It starts at 180 and counts down to 0. The 75A START LED blinks once every second. During

the cool down period, no current is de- livered to the battery. After 3 minutes, the 75A START LED will stop blinking and will light continuously, indicating that another crank cycle can be started. The digital display will change from display- ing the countdown back to displaying the battery voltage. The CHARGING LED will then be lit.

ENGINE STARTING NOTES:

•If the battery is disconnected during the cool down period, the charger will reset.

using your battery charger

OVERVIEW

Using this battery charger is very simple. First, connect the battery and AC power following the precautions listed under “OPERATING INSTRUCTIONS”. Then select the appropriate BATTERY TYPE and CHARGE RATE for your battery. The charger will then do everything automati- cally. This section explains a few details.

CHARGING: If the charger does not detect a properly connected battery, the CHECK (red) LED will light continuously until such a battery is detected. Charging will not begin while the Check LED is on. When charging begins, the CHARGING LED will be lit.

AUTOMATIC SHUT OFF: When the 2A, 12A   30A charge rate is selected, the charger is set to perform an automatic charge. When an automatic charge is performed, the charger stops charging au- tomatically after the battery is charged.

ABORTED CHARGE: If charging can’t be completed normally, charging will be aborted. When charging is aborted, the charger’s output is shut off and the red CHECK LED and digital display blink on and off (at opposite times). In that state, the charger ignores all buttons. To reset from after an aborted charge, either disconnect the battery or unplug the charger.

DESULFATION MODE: If a battery is left discharged for an extended period, it could become sulfated and not accept

a normal charge. If the charger detects a sulfated battery, the charger will switch to a special mode of operation designed for such batteries. Activation of the special desulfation mode is indicated by blinking the CHARGING LED. If successful, nor- mal charging will resume after the battery is desulfated. The CHARGING LED will then stop blinking and light continuously. Desulfation could take up to 10 hours. If desulfation fails, charging will be aborted and the CHECK (red) LED will blink.

CO M PLE T I O N O F CH A RG I N G: Charge completion is indicated by the CHARGED (green) LED; when lit, the charger has stopped charging and switched to the Maintain Mode of operation.

MAINTAIN MODE: When the CHARGED (green) LED is lit, the charger has started Maintain Mode. This mode of operation is also known as Float-Mode Monitoring. In this mode, the charger keeps the battery fully charged by delivering a small amount of current, when necessary. The voltage is maintained at a level determined by the BATTERY TYPE selected.

GENERAL CHARGING NOTES:

The charger is designed to control its cooling fan for efficient operation. Con- sequently, it is normal for the fan to start and stop when maintaining a fully charged battery. The fan does not run in Tester Mode.