Samlexpower SEC-1245A Owner's Manual - page 25
When the charger is powered and is being used as a DC power supply / UPS, the
output voltage drops when the DC load is switched on or increased.
The charger is being forced into current limit condition The load is trying to draw current
more than the current limit value of the charger – 45 A for SEC-1245A and 25 A for
SEC-2425A (the current limit value is the maximum specified charging Amps). Once the
load current reaches the current limit value, the current limit circuit is activated and the
output voltage drops. Some loads like motors, compressors, incandescent lamps, halogen
lamps, heating elements, relays, coils, capacitors etc. draw very large inrush / starting
currents which may reach up to 10 times their normal operating currents. Ensure that the
starting / inrush current or the maximum operating current of the load is lower than the
current limit value of the charger. Do not use a load that draws more than 45 A for SEC-
1245A or more than 25 A for SEC-2425A. Once the load current is reduced below the
above limiting values, the charger will recover automatically.
The battery is getting over charged / overheated / loses water or boils
There is an external load connected to the battery when it is being charged 3-stage
charging is recommended for charging stand-alone or unloaded batteries (there is no load
connected to the battery when it is being charged). If a load is also connected simulta-
neously, a part of the charger’s output current will be diverted to this load. Thus, the
charger may remain locked in Stage 2 if the current drawn by the load is more than the
preset value of threshold current determining transition from Stage 2 to Stage 3 .This will
lead to overcharging, overheating and loss of electrolyte.
For charging a battery when a load is also connected simultaneously, Stage 2 voltage
should be the same as Stage 3 voltage (Stage 2 is disabled). Select “Loaded Battery” with
the help of Dip Switches S1 and S2 of the set of 4 Dip Switches (5) – See under
“Selecting the Type of Battery and Charging Stages”
Two banks of batteries are being charged and the batteries in the two banks are in
dissimilar state of discharge
When charging more than one bank of batteries at the same
time using 3 Stage Charging, ensure that the batteries in the banks are in a similar
discharged condition. If one bank is completely discharged and another is almost fully
charged, the bank that is fully charged will be subjected to over charge condition during
the time when the charger remains in Stage 2 for charging the completely discharged
bank.
If 2 banks of batteries are required to be charged and they are at different discharged
conditions, select “2 Stage Charging” with the help of switches S1 and S2 of the set of 4
Dip Switches (5) (both S1 & S2 in off condition) – See under “Selecting the Type of
Battery and Charging Stages”
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