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4. OPERATION
4.1. Battery charging
After applying mains power and switching the unit ON:
•
all LEDs will be lit during two seconds
•
the green LED will then be on to indicate the unit is "On"
•
the state of charge will be indicated by lighting one of four yellow LEDs
•
the actual output voltage and current will be indicated by the appropriate red LED bars
•
the internal fans may run depending upon the temperature inside the cabinet (temperature controlled)
In case the red LED is lit, refer to section 6.
4.2. Seven stage charge curve for lead-acid batteries
4.2.1. Bulk
Entered when the charger is started (DS-2 on and battery voltage <26V, or DS-2 off), or when the battery voltage falls below
26,4V (due to a heavy load) during at least 1 minute. Constant current is applied until gassing voltage is reached (28,8V for a
24V battery).
4.2.2. BatterySafe
If absorption voltage is set higher than 28,8V, the rate of voltage increase beyond 28.8V is limited to 14mV/minute, in order to
prevent excessive gassing.
4.2.3. Absorption
After the absorption voltage has been reached, the charger operates in constant voltage mode.
In case of adaptive charging, the absorption time is dependent on the bulk time, see section 3.3.
4.2.4. Automatic equalization
If automatic equalization has been set to “on”, the absorption period is followed by a second voltage limited constant current
period: see section 3.3. This feature will charge VRLA batteries to the full 100%, and prevent stratification of the electrolyte in
flooded batteries.
Alternatively, manual equalization can be applied.
4.2.5. Float
Float voltage is applied to keep the battery fully charged.
In case of adaptive charging, the float voltage time is dependent on the bulk time, see section 3.3.
4.2.6. Storage
After float charge the output voltage is reduced to storage level. This level is not sufficient to compensate for slow self-discharge
of the battery, but will limit water loss and corrosion of the positive plates to a minimum when the battery is not used.
4.2.7. Weekly battery ‘refresh’
Once a week the charger will enter Repeated Absorption-mode during one hour to ’refresh’ (i. e. to fully charge) the battery.
Figure 8
time
storage voltage
float voltage
absorption voltage
U
bulk
absorption
float
storage
100%
I
Equalization
Summary of Contents for Skylla-i 24/100
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