9
NOTE : If the charge is completed (green LED L3 – on) and the charger is not working (yellow LED L4 – off) battery plug
can be disconnected avoiding electric arcs.
Connecting a new battery the charger re-starts automatically
5.3
Charging profile Wa and Wap - features
Chargers perform a decreasing current profile called Wa regulated by the rule DIN 41774
The cycle is divided in two parts:
The bulk phase : from beginning of the charge up to the gassing point (2,4Vel)
The final charger : from gassing point (2,4Vel) up to the end of the charge.
Once the cycle is completed the charger con perform additional equalisation and preservation charges.
Equalisation and preservation can be activated on demand.
Model indentified as
Advanced
performs a classical cycle having an estimated recharging time of about 10-13 hours. On
the other hand model identified as
Pulse
once completed the bulk phase (>2,4Vel) performs a different final phase.
Pulse cycle in fact at regular step defined by time (min) is able to force a current higher than on standard Wa profile in
order to accelerate the normal timing of final stage. The electronic board keep under control all charging parameters in
order to optimize the duration. Pulse profile is able to reduce time of recharger to 7-8h.
Here is a table that underline the functioning of both models:
Phase
Charge
Duration
Advance / Pulse
1
Bulk
From beginning of charge up to Vbatt=2,4Vel
(programmable)
(min. 0,5 h – max 11 h)
Starts with (*) = 100% Inom
(@2,0Vel)
Ends = 50% Inom (@2,4Vel)
2
Final
From 2,4Vel up to the end of the charge. The arrest of
the cycle is defined by derivative (dV/dt) termination or
by capacitive (accumulation of Ah) termination.
Starts with = 50% Inom (@2,4Vel)
Ends (#) = 25% Inom (@2,65Vel)
3
Equalisation
5 min every hour for the following 15h
4
Preservation
Once the Equalisation cycle is completed, 5 min every
15h until the charger is turned off.
(*) For details regarding Ah and related Inom please refer to dedicated Ah chart table
(#) Current values of Pulse model varies continuously during the final charge.
5.4
Automatic termination of the charge - details
The charger stops the charge when detects that the battery is fully charged.
It analyses and considers different parameters. Some are always in function, others can be activated or disabled on
demand.
Termination
by
Factors determining charge termination
Time
It is defined a max duration above which the charger stops the cycle. (disabling not permitted)
Voltage
It is defined a max voltage above which the charger stops the cycle. (disabling not permitted)
Derivative
(dV/dt)
Termination is defined when voltage is no longer growing.
This type of termination is based on the assumption that when a battery is fully charged it cannot grow its
output voltage. PCB elaborates an algorithm able to determine the steepness (or derivate dV/dt) of the
curve referring to the battery voltage growth.
Values of this specific steepness is programmable (disabling permitted)
Charging
factor
Termination is defined when the charger has supplied all the Ah perviously descahrged adding a
percentage factor called "charging factor".
This termination is based on the assumption that it is necessary to reintegrate more Ah in respect of those
that have been previously taken out.
PCB elaborates an algorithm able to detect the Ah taken and at same time the Ah % set necesary to be
reintegrated.
If 200Ah are taken from the battery and charging factor has been set at 1,2 ( or 20%) the charger
concludes the cycle when 240Ah are accumulated (200Ah +20%)
Charging factor value is programmable (disabling permitted)
