24 | SAMLEX AMERICA INC.
SeCtION 6 |
Operation
Switching on (With Battery Backup - external Battery is connected):
-
Check that the load has been connected to the Load Terminal (7A, 7B, fig 2.1) and NoT to
the Battery Terminals (8A, 8B - fig 2.1).
-
Check that the load has been connected to the Load Terminals (7A, 7B - fig 2.1) through
external 25A Load Side fuse (f2).
-
Check that the external battery has been connected to the Battery Terminals (8A,
8B - fig 2.1) through external 25A Battery Side fuse (f1).
-
Switch oN the unit with the help of the Red Power oN / off Switch (1). If AC power is avail-
able and the internal AC side fuse is intact, the oN / off Switch will be lighted Red indicat-
ing that the Power Supply Section is in oN condition.
-
After a few milli sec, 54.8V will be available at the Load Terminals (7A, 7B - fig 2.1)and the
external battery will start charging at current of up to 2A determined by its State of Charge.
The voltage at the Battery Terminals (8A, 8B - fig 2.1) will get clamped to the actual termi-
nal voltage of the battery corresponding to its State of Charge.
-
Switch oN the load.
-
The Power Supply Section will supply all the current consumed by the load (up to its rated
current limit value) and the external battery will be maintained in charged condition all the
time at float Voltage of 54V to 54.6V (when fully charged), depending on the value of load
current being supplied.
Switching oFF:
-
Switch off the load first
-
Switch off the unit with the help of the Red Power oN / off Switch (1). Red light inside the
oN /off switch will switch off
cHARGinG AnD BAckUP oPeRAtion
Charging current will be proportional to the discharged state of the battery and is lim-
ited to maximum of 2A when the battery is completely discharged (Standing Voltage of
42.8V). The current will taper down from 2A as the battery gets charged and its voltage
rises. When the battery is fully charged, the current will drop down to 0.1% of the Ah
capacity of the battery to compensate for self-discharge. When fully charged, the volt-
age at the Battery Terminals (8A, 8B - fig 2.1) will be the float Voltage of 54V to 54.6V
depending on value of load current.
Battery should not be charged at very high current. Normally, as a Rule of Thumb, the
maximum charging current should be limited to 10% of the Ah capacity at 20 Hour Rate
unless higher current is allowed by the manufacturer. Higher charging current produces
higher heating, which reduces the life of the battery. further, higher charging current
will not re-charge the battery to full 100% capacity unless the Absorption Voltage is
increased proportionately. This may not be possible with chargers that do not have pro-
grammable charging voltages. It is, therefore, recommended that the capacity of the
battery used with this unit should be in the range of 10 to 25Ah which is appropriate for
2A charging current.
The voltage seen at the Battery Terminals (8A, 8B - fig 2.1) will be the actual terminal
voltage of the battery (assuming no voltage drop in the battery cables) and will be
proportional to its State of Charge. When the battery is fully charged, the voltage at the
Battery Terminals (8A, 8B - fig 2.1) will be 54V to 54.6V.
Summary of Contents for SEC-4825BRM
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