8 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 9
SeCtIOn 4 |
Protections
Section will provide 25A and the battery will provide the balance 15A. The battery will
start draining at 15A. The voltage at the Battery Terminals (5, 6) will start dropping and
will be equal to the voltage corresponding to its actual State of Charge. The voltage at
the Load Terminals (3, 4) will be around 0.3 ± 0.2V below the voltage at the Battery Ter-
minals (5, 6). External 25A fuse (f2) on the load side will blow only on sustained current
≥ 25A for > 100 sec but will not blow at higher short duration surge currents deter-
mined by its Time Current characteristics. for example, based on the Time Current
Characteristics of 32V, 25A fuse Type ATC-25 from Cooper Bussmann, the fuse can pass
extremely high currents for shorter durations is as follows:
•
550A for 10 ms
•
170A for 100 ms
•
40A for 1 sec
•
25A continuous (for > 100 sec)
In case of short circuit on the load side, the external 25A fuse (f2) on the load side will
blow because of very high additional current supplied by the battery (Additional battery
current supplied into the short circuit on the load side = Short circuit current - 25A from
the Power Supply Section). for example, if a short circuit current of 170A tries to flow
for > 100 ms, 25A will be supplied by the Power Supply Section and the balance 145A
will be supplied by the battery. As the external 25A fuse (f2) on the load side will see
170A and the external 25A fuse (f1) on the battery side will see 145A, the external 25A
load side fuse (f2) will blow first.
PRotection AGAinSt ReVeRSe PoLARitY oF BAtteRY connection
In case of reverse polarity of battery connection, internal Diode connected across the
battery output terminals will be forward biased and the external 32V, 25A battery side
fuse (f1) will blow.
!
cAUtion!
reversal of polarity may result in permanent damage to the unit and to the load.
DAMAGe DUe to ReVeRSe PoLARitY iS not coVeReD UnDeR WARRAntY.
oVeR teMPeRAtURe PRotection
!
cAUtion!
Keep the unit in a well-ventilated, cool and open area. Do NoT block the vent
holes on the sides or the discharge openings of the cooling fan at the bottom
of the unit.
In case the fan fails or if cooling is not adequate due to higher ambient temperature
or inadequate air circulation or blockage of air ventilation openings, the temperature
of the output power transformer windings will rise and at temperature ≥ 105°C ± 5°C
/ 221°f ± 9°f, Thermal Switch mounted on the windings will open and will activate
over-temperature protection circuit to shut down the Power Supply Section. When the
