Samlex Power SEC-1215UL Manuel Du Propriétaire page 10

SECTION 4 |
4.1.3 Stage 3 - Constant Voltage , Float or Maintenance Charging Stage
As explained at Section 4.1.2, as the charging current drops below the preset threshold
(1.5 to 2 amps for SEC-1215UL / SEC-2415UL and 2.5 A to 3 A for SEC-1230UL), it signals
that the battery is 100% charged.
In this "Float or Maintenance Charging Stage", the charger outputs a constant volt-
age of 13.5 V for 12 V system and 27 V for 24 V system. This helps in maintaining 100%
capacity of the battery and also compensates for self discharge. The battery can remain
connected in this stage indefinitely without the risk of overcharging or excessive loss of
electrolyte. In Float Stage, the battery will consume around 0.1% of its Ah capacity to
compensate for self discharge.
!
CAUTION!
3 stage charging is recommended for charging stand-alone, unloaded batteries
(there is no load connected to the battery when it is being charged).
If a load is also connected simultaneously, a part of the charger's output current
will be diverted to this load. Thus, the charger may remain locked in the "Boost
or Absorption Mode" if the current drawn by the load is more than the preset
value of threshold current determining change over between the Boost and Float
Stages (1.5 to 2A for SEC-1215UL / 2415UL and 2.5 to 3A for SEC-1230UL). This
will lead to overcharging and loss of electrolyte.
For charging a battery when a load is also connected simultaneously, the "Boost
or Absorption Stage" is required to be disabled. Select "Battery with Load" using
the DIP switch. See details under "Powering other DC Loads" at Section 5.4.1.
4.2 PROTECTIONS
4.2.1 Short Circuit Shut Down
In case of a short circuit on the output side, the charger will shut down. The Red LED (2 in
Figs 2.1 to 2.3) will switch off. The charger will automatically recover once the short circuit
condition is removed.
4.2.2 Over load Current Limiting
The current drawn by the battery / load is automatically limited to a maximum of 15 A
for SEC-1215UL / SEC-2415UL and 30A for SEC-1230UL. If the battery / load tries to draw
a higher current than these limits, the output voltage of the unit will start to drop.
If a battery is connected, the output voltage will be clamped to the actual battery volt-
age proportional to its state of charge. The unit will automatically recover when the
overload condition is removed.
4.2.3 Reverse Battery Connection Cut Off
The output is internally fused on the DC side (20A for SEC-1215UL / SEC-2415UL and 40A
for SEC-1230UL). In case, the polarity of the battery connection is reversed, the fuse(s)
will blow . The Red LED (2 in Figs 2.1 to 2.3) will switch off. The fuse(s) will be required
to be replaced for the unit to function again.
10 | SAMLEX AMERICA INC.
Charging States & Protections