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Stage 2 - Constant Overcharge Voltage, Timed Absorption / Boost Charge Mode (Uo
Phase): When the charger enters Stage 2 from Stage 1, the battery is approximately 70% to
80% recharged. As soon as it enters this stage, a timer circuit is also initiated. The timer
circuit can be selected to operate for 4 or 8 hours with the help of DIP Switches (5) (See
under "Selecting time for Absorption / Boost Stage"). During this stage, the charger will
output a higher constant overcharge voltage whose value will depend upon the type of
battery or charging stages selected ( The type of battery and charging stages are selected with
the help of DIP Switches (5) – See under "Selecting The Type of Battery and Charging
Stages"):
•
14.4 V (SEC-1245A) or 28.8 V (SEC-2425A) when Flooded / AGM battery is
selected
•
14 V (SEC-1245A) or 28 V (SEC-2425A) when Gel Cell battery is selected
•
13.5 V (SEC-1245A) or 27 V (SEC-2425A) when loaded battery is selected (2
stage charging)
The battery will further absorb charge at this voltage and the charging current will further
reduce. When the charging current reduces to approximately 10% of the charger capacity "I"
(4.5 A +/0 .5 A for SEC-1245A and 3 A +/- 0.5 A for SEC-2425A), the charger automatically
changes over to "Stage 3 - Float / Maintenance Charge Mode (U Phase)". However, if the
charging current does not reduce to the above threshold level (because of some defective /
shorted cells or due to an external load in a loaded battery), the charger will be forced to
change-over to "Stage 3 or Float / Maintenance Charge Mode (U Phase)" after elapse of 4 or
8 hours determined by the selected duration of the timer circuit. The battery will be charged
to approx. 95% of its capacity by the end of this stage. Ideally it would be at 100%, but there
are some practical limitations like temperature effect etc that usually prevent full recharge.
During this Stage, following LED indications are provided:
•
Charging Indicator LED (4) on the front panel turns orange
•
Yellow LED under "Uo Phase" is lighted on the Remote Panel (15) ( Optional
accessory)
NOTE: The threshold of current for change-over between the Absorbtion / Boost Charge
Mode ("Uo" Phase) & the Float / Maintenance Charge Mode ("U" Phase) are
different as follows:
•
From "Uo" Phase to "U" Phase
•
From "U" Phase to "Uo" Phase
Stage 3 – Constant Voltage, Float or Maintenance Charge Mode (U Phase): During
this mode, the charger outputs a constant voltage U = 13.5 V (SEC-1245A) or 27 V (SEC-
2425A). This helps in maintaining full capacity of the battery and also provides replacement
charge to overcome self discharge of the battery. The battery can remain connected in this
stage indefinitely without the risk of discharging.
During this Stage, following LED indications are provided:
•
Charging Indicator LED (4) on the front panel turns green
•
Green LED under "U Phase" is lighted on the Remote Panel (15) ( Optional
accessory)
SEC-1245A
4.5 A +/- 0.5 A
9 A +/- 1 A
Page 11
SEC-2425A
3 A +/- 0.5 A
7 A +/- 1 A
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