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a)
Hiccup Mode Overload Protection: When the voltage drop across the Load Sense
Resistor in the SMPS Section is more than 5.18 to 5.44V (output current > 27.6 to
29A) and is sustained for 40-50ms, Hiccup Mode Overload Protection is triggered.
The output of the SMPS is shut down. After 3 to 4 sec, the SMPS Section is switched
ON again. If the overload still exists for 40-50ms, the SMPS will shut down again.
Hence, for a continuous overload of > 27.6 to 29A, the SMPS Section switches ON
and OFF (hiccup) every 3 to 4 sec. The average output voltage of the SMPS during
this protection will be nearly 0V.
b)
Hiccup Mode Short-Circuit Protection: When the voltage drop across the Load Sense
Resistor inside the SMPS Section is more than 7.5V (output current > 40A) and is
sustained for 4 to 6.5 ms, Hiccup Mode Short Circuit Protection is triggered. The
output of the SMPS is shut down. After 2 to 3 sec, the SMPS is switched ON again. If
the short circuit still exists for 4 to 6.5 ms, the SMPS will shut down again. Hence, for
a continuous short circuit, the SMPS switches ON and OFF (hiccup) every 2 to 3 sec.
The average output voltage of the SMPS during this protection will be nearly 0V.
3.5 BATTERY CHARGING & BATTERY BACK-UP
WARNING!
These units are power supplies and not battery chargers. Do not connect these
units directly to a battery.
MISE EN GARDE!
Ces unités sont des unités d’alimentation et non pas les chargeurs de batterie.
Ne pas connecter ces appareils directement à une batterie.
These units should NOT BE DIRECTLY CONNECTED TO A BATTERY for charging or for
battery back-up. Battery charging and battery back-up may be undertaken only when the
battery is connected through suitable external isolating diodes and charge limiting resistor.
The isolating diode will ensure that the battery does not back power the power supply. When
a battery is deeply discharged, it will initially draw a very large charging current and thus, will
force the power supply into current limit mode for prolonged periods. This is harmful for the
power supply. The charge limiting resistor will limit the charging current, thereby, ensuring
that the maximum charging current is well below the current limit value of the power supply.
i
INFO
It is recommended that the following optional battery back-up modules may
be used for battery back-up application:
For SEC-1212P and SEC-1223P: Battery Back Up Module Model No. BBM-1225
For SEC-1235P / 1235P-M: Battery Back Up Module No. BBM-12100
SECTION 3
| Description & Operation
Summary of Contents for SEC-1212P
Page 23: ...SAMLEX AMERICA INC 23 Notes ...
