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ADJUSTING OUTPUT VOLTAGE
!
The output voltage can be adjusted with the help of the internal potentiometer
marked "VR2". Adjustment range is (11V to 16 V).
WARNING! At output voltages higher than 13.8 V, the maximum output current
should be reduced linearly from 30 A at 13.8 V to 25 A at 16 V.
OVERLOAD / SHORT CIRCUIT
The units are protected against overload by constant current limiting at 35 A. If the
load tries to draw more than 35A, the output voltage will drop and will no longer be
regulated. The output voltage will drop to near 0 V in case of a dead short. The unit
will recover automatically once the overload condition is removed.
OVER TEMPERATURE
Protection is provided to shut down the power supply in case the fan fails or if the
air flow is blocked or if the ambient temperature is very high. A temperature sensor
is mounted on the power transformer and will activate at 105° C +/- 5° C and shut
down the output of the power supply. After the power supply cools down to 95° C
+/- 5° C, the temperature sensor will de-activate and the power supply will re-
sume operation automatically
BATTERY CHARGING AND BATTERY BACKUP
WARNING!
These units are power supplies and not battery chargers.
Do not connect these units directly to a battery
The voltage of a 12 V battery in a deep discharged condition will be around 10 to 11.4 V.
When a deeply discharged 12 V battery is charged at say 13.8 V, it will initially draw a very
large current. As the battery capacity is restored, the battery voltage increases to around
13.8 V when fully charged and the current drawn by the battery reduces a few hundred
mA.
If a deeply discharged battery is directly charged by SEC-1235CE, the battery will initially
draw a very large current and thus, will force the power supply into current limit mode for
prolonged period of time. This is harmful for the power supply as operating under prolonged
periods under current limit conditions is an abnormal operating condition.
SEC-1235CE may be used for battery charging and battery backup application only when
the battery is charged through a suitable external isolating diode and charge limiting resistor
in series with the power supply. The isolating diode will ensure that the battery does not
feed power back into the power supply and the series connected charge limiting resistor
will limit the maximum charging current to a value less than the current limit.
It is recommended that the optional Battery Backup Module BBM-12100 may be used in
conjunction with the power supply for battery charging / backup application.
Call Technical Support at 1-800-561-5885 for further assistance
PROTECTIONS
5.
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