Lead-Acid (Pb) Charge Programs - GRAUPNER ULTRA TRIO PLUS 14 Operating Manual

14. Pb (lead-acid) programs (Output 1)
This program is designed for charging and discharging lead / sulphuric acid and lead / gel
batteries with nominal voltages of exactly 2, 4, 6 and 12 V (1, 2, 3 and 6 cells).
Caution: the charger will not recognize lead-acid batteries with other nominal voltages, and
such batteries must not be connected to it.
Lead-acid batteries behave entirely differently to Ni-Cd and Ni-MH batteries. Lead-acid batteries
can only deliver relatively low currents relative to their capacity, and similar restrictions very
definitely apply to charging. Manufacturers usually state 14 to 16 hours for achieving nominal
capacity when recharging at the normal charge current. The „normal" charge current is defined
as one tenth of the battery's nominal capacity. Example: battery capacity = 12 Ah —> normal
charge current = 1.2 A. In contrast to Ni-Cd and Ni-MH batteries, lead-acid chargers generally
monitor the battery's voltage in order to determine when it is fully charged.
Caution: lead-acid batteries cannot and must not be fast-charged! Always select the
charge current which the battery manufacturer recommends. Please also bear in mind that
the nominal capacity (i.e. useful life) of a lead-acid battery is very quickly compromised by
incorrect handling, including overcharging, repeated 100% discharges and, in particular, deep
discharging. The magnitude of the charge / discharge currents is also crucial to the actual
battery capacity which can be exploited, i.e. the higher the current, the lower the capacity which
the battery can deliver.
The values selected in the user settings for charge termination delay and safety timer have no
effect in the Pb charge programs.
P b m a n u a l
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2
sec.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
P b - C : 2 . 5 A
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
+ -
INC DEC
If the battery manufacturer states a low maximum charge current, then it is important to limit the
charge current to that value to avoid the charger setting a higher current if the battery appears
to be willing to accept charge.
The battery can then be connected to the charger and the charge process started: the unit
starts charging at 0.00 A and slowly raises the current until it reaches the set limit.
The charger constantly assesses the state of the battery during the charge process, and
adjusts the charge current to suit its condition.
The charge program automatically determines the number of cells (cell count) in the battery by
measuring its overall voltage.
44
Pb
MODE
MANUAL- discharge
program program
Pb manual program
In this program you can set the maximum permissible
charge current using the INC / DEC buttons, but only
before you connect the lead-acid battery for charging.
This setting only determines the top limit which the
charger is permitted to feed to the battery.
Pb
MODE