Fairbanks 5001 Series QuickSilver IS - Manual (Page 18)

C. States of Operation
STATE 1: NO BATTERY
• RED LED is constantly on.
• No battery is attached to the charger, and no current is flowing from the charger.
STATE 2: UNDER VOLTAGE BATTERY
• RED LED flashes at a set interval.
• A battery is attached to the charger, but is below the 3.6V threshold.
– The charger will attempt a trickle charge for up to sixteen (16) hours to restore the
battery to normal state.
– If at the end of sixteen (16) hours the battery has not reached 3.6V, the charger
shuts down.
– RED LED flashes with a steady YELLOW LED.
– No battery charge exists while in this state.
• The small trickle charge in this state is about 10% duty cycle, or about 60mA*.
STATE 3: CHARGING
• YELLOW LED is on constantly.
• Indicates the battery is between 3.6V and 7.0V.
• Charger will continue charging for up to sixteen (16) hours
– If charger has not reach next state in the sixteen (16) hours, it will determine voltage
▪ If charger is between 6.4V and 7.2V, the unit switches to State 4: Trickle Charge.
▪ If charger is not to 6.4V, charger shuts down and shows YELLOW LED on steady with
– RED LED flashing (used to indicate possible fault with battery).
• Full charge is produced in this state is 200mA*.
STATE 4: TRICKLE CHARGE
• GREEN LED will be on steady, battery pack is considered fully charged
• Indicates the battery has reached 7.0V, and is now between 6.6V and 7.2V.
– Hysteresis is built in to allow battery’s chemicals to settle.
• Charger will stay in this state indefinitely as long as battery voltage remains between
6.6V and 7.2V.
– If voltage drops below 6.6V, the charger returns to State 3: Charging.
– If voltage rises above 7.2V, the charger switches to State 5: Over Voltage.
• Trickle charge is produced at about 35% duty cycle or about 60mA*.
STATE 5: OVER VOLTAGE
• GREEN LED will be on steady with the RED LED flashing.
• This indicates the battery has been over charged above 7.2V.
– Current from the charger is stopped and charger waits for voltage level to drop back
below 7.2V.
• No current is produced
* Current levels will vary between batteries and is only given as a reference.
50770 18 04/12 Rev. 5