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Stage - 2: Equalization Stage. The controller enters this stage at point “C1” from
the previous Bulk Stage when the battery voltage reaches the Equalization Voltage
Regulation Set Point “Ve” and is sustained for a minimum period of around 50 to
55 sec. This stage is timed for continuous / cumulative period of 1/2/3 Hours based
on the programmed type of battery (Please see Table 6.3 under heading “Standard
Battery Charging Programs” on page 38). During the Equalization period (Curve
portion C1 to D1), the battery is in overcharge condition, is gassing and bubbling
vigorously and the electrolyte gets stirred up resulting in removal of stratification.
Also, weaker cells are brought up to full charge too (equalized).
In this stage, the Switch operates under PWM control by feeding pulsing Short Circuit
Current “Isc” with constantly reducing Duty Cycle (< 100% and > 0%) / average current
to keep the battery voltage constant at the Equalization Voltage Regulation Set Point
“Ve” (Curve portion C1 to D1). This is equivalent to Constant Voltage Charging. This is
an intentional, controlled over charge condition for the battery for 1/2/3 Hrs.
Change over to the next Float Voltage Regulation Set Point “Vf” is possible only
after the battery voltage is held at the selected Equalization Voltage Regulation
Set Point “Ve” for continuous or cumulative period of 1/2/3 Hours depending upon
the programmed type of battery (Please see Table 6.3 under heading “Standard
Battery Charging Programs” on page 38). If “Ve” cannot be maintained continuously
/ cumulatively for 1/2/3 Hrs, the charger will NOT exit out of Equalization Stage and
transition to Float Stage will NOT take place.
During this stage, LCD Screen 4 (Fig 5.3) displays “ State: Equalization”. LCD Screen 6
(Fig 5.3) displays the programmed Equalization parameters. Screen 1 (Fig 5.3) shows the
programmed value of Equalization Voltage Regulation Set Point “Ve” under “BatV”.
The Status LED on the front panel will blink ORANGE, once per second.
NOTE: During Equalization Stage, if the load current is more than the current from the
solar panel, the battery voltage will drop. If the battery voltage drops around
1V below the Equalization Transition Voltage Set Point “Ve” for around 1 min,
the controller reverts to Bulk Stage with 100% Duty Cycle. The LCD Screen 4
(Fig 5.3) will still display “State: Equalization” and the front panel Status LED
will still be blinking Orange. It will revert to PWM when the
battery voltage reaches Equalization Transition Voltage Set Point “Ve” and is
sustained for a minimum period of around 50 to 55 sec.
WARNING!
Once Equalization Stage is activated, it will not exit this Stage unless the
there is adequate charging current from the solar panel to charge the battery
up to the programmed Equalization Voltage Regulation Set Point “Ve” and
maintain this voltage level for continuous or cumulative period of 1/2/3
Hours depending upon the programmed type of battery (Please see Table 6.3
under heading “Standard Battery Charging Programs” on page 38). If “Ve”
cannot be maintained continuously for 1/2/3 Hrs due to inadequate charging
SECTION 4 |
Principle of Operation & Features
Summary of Contents for samlexpower SCC-30AB
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