10
CHARGING CYCLE
Voltage/Current
Voltage
Time
Current
Bulk
Io
Start
Is
Absorption
Uo
Pulse
Up
Supply
Uo
Recond
I
Setting: 14.4 V or 14.7 V
MULTI US 7000 performs a 5-step fully automatic charge cycle, IIUoIUp. Lamp B for 14.4
V or Lamp C for 14.7 V.
Start:
Starting phase for charging. The current is restricted to 3 A. It ends when the volt-
age is above 10.5 V. There is a time-out after 6 hours and the charger switches to Error
indication, (lamp 0). This indicates a faulty battery or an undersized charger for the battery
pack. Lamp 1 indicates this phase.
Bulk:
Main part of the charge cycle when about 80% of the charge is returned. The
charge is carried out at maximum charge until full voltage is achieved. Lamp 2 indicates
this phase.
Absorption:
Final part of the charge. The voltage is kept constant until the current has
tapered to 0.6 A when the charger goes into Pulse Maintenance mode. The phase is also
ended if the total time for bulk and absorption exceeds 40 hours. Lamp 3 indicates this
phase.
Pulse Maintenance charge:
The state of charge is between 95% and 100%. A pulse at
5 A is sent out if the voltage drops. This gives minimum water loss and maximum life. The
charger can normally be connected for extended periods without problems. However, it is
recommended to monitor batteries on charge.
The charger measures the voltage every 10 minutes to decide whether a new pulse
should come. This means that these pulses can’t come more often than every 10 minutes.
