16 | SAMLEX AMERICA INC.
SECTION 4 |
Principles of Operation
4.3.3.2 Charging characteristics during this stage are as follows:
• Float Stage is used to maintain the battery's charge without losing electrolyte
through gassing and also, to compensate for self-discharge. For example, a bat-
tery not under charge and sitting idle with no load will self discharge at around
1% of its remaining Ah capacity every day.
• Float Stage current is around 0.1% of the Ah capacity of the battery
• During this stage, Green LED marked "Float"/“U Phase" on the optional Remote
Control Model 900-RC will be lighted
4.3.3.3 Thresholds of Charger Currents for Change over Between Absorption and Float
Stages:
The thresholds of charger current for change over between the Absorption
Stage (
Displayed as “U0” Phase in optional Remote Control 900-RC
) and Float Stage
(
Displayed as “U” Phase in optional Remote Control 900-RC
) are shown below:
Change Over
SEC-1250UL SEC-2425UL
From Absorption Stage to Float Stage
5A +/- 0.5A
3A +/- 0.5A
From Float Stage to Absorption Stage
10A +/- 0.5A 6A +/- 0.5A
SECTION 5 |
Protections
The charger has the following protections:
5.1 SHORT CIRCUIT SHUT DOWN
In case of a short circuit on the output side, the output of the charger will be shut down.
Another symptom of short circuit shut down is that the fan will be ON till the unit is
reset or switched OFF. On the optional Remote Control 900-RC, Green LED marked
"Power" and Red LED marked "Bulk"/ "I Phase" will be lit. The charger will be latched
in this shut down condition and will NOT recover automatically even after the short
circuit condition is removed. To reset, the AC input power ON/ OFF switch at the back of
the unit has to be switched OFF and ON again.
5.2 OVER LOAD CURRENT LIMITING
The current drawn by the load is automatically limited to a maximum of 50A for
SEC-1250UL (
25A +/- 1A in “Half Power Mode”
) and 25A for SEC-2425UL (
12.5A +/- 1A
when in “Half Power Mode”
). If the load tries to draw a higher current than these lim-
its, the output voltage of the unit will start to drop. The unit will automatically recover
when the overload condition is removed.
5.3 REVERSE BATTERY CONNECTION – DC SIDE FUSES WILL BLOW
The output is internally fused on the DC side - 2 x 30A fuses for SEC-1250UL and 2 X
20A fuses for SEC-2425UL. In case, the polarity of the battery connection is reversed, the