Samlex America SEC-2415UL - Manuel (Page 9)

8 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 9
seCtIOn 4 | Charging states & Protections
In this "Float or Maintenance Charging
Stage", the charger outputs a constant
voltage of 13.5 V for 12 V system and
27 V for 24 V system. This helps in main-
taining 100% capacity of the battery and
also compensates for self discharge. The
battery can remain connected in this stage
indefinitely without the risk of overcharg-
ing or excessive loss of electrolyte.
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. 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 disa-
bled. Select "Battery with Load" using the
DIP switch. See details under "Powering
other DC Loads" at page 14.
tHe cHARgeR HAS tHe
Following PRotectionS:
Short circuit Shut Down
In case of a short circuit on the output side,
the charger will shut down. The Red LED
will switch off. The charger will automati-
cally recover once the short circuit condi-
tion is removed.
over load current limiting
The current drawn by the load is auto-
matically limited to a maximum of 15 A
for SEC-1215UL / SEC-2415UL and 30 A for
SEC-1230UL. If the load tries to draw a
higher current than these limits, the out-
put voltage of the unit will start to drop.
if a battery is connected, the output
voltage will be clamped to the actual
battery voltage. The unit will automati-
cally recover when the overload condition
is removed.
Reverse Battery connection cut off
The output is internally fused on the DC
side. In case, the polarity of the battery
connection is reversed, the fuse(s) will
blow . The red LED will switch off. The
fuse(s) will be required to be replaced for
the unit to function again.
thermal overload Shutdown
SEC-1215UL is cooled by convection and
does not have any thermal overload
shut down.
SeC-1230UL and SeC-2415UL are cooled by
convection and in addition, have a tem-
perature controlled fan for forced air cool-
ing. Two temperature sensors mounted on
the power transformer control the switch-
ing of the fan and over temperature shut
down. The fan will be switched on by the
first temperature sensor when the power
transformer reaches 70°C. Hence, at lower
loads, the fan may not cut in and will be
off. this is normal.
In case the fan fails or if the cooling is not
adequate, the second temperature sen-
sor will shut down the unit if the power
transformer reaches 100°C. The red LED
will switch off. The unit will automatically
recover on removal of thermal overload
condition.
cAUtion:
Keep the charger in a well ventilated,
cool and open area. Do not block the vent
holes on the sides or the discharge open-
ings of the cooling fan.