14
4.3. Four stage charge curve for Lithium Iron Phosphate (LiFePo4) batteries
4.3.1. 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
26,7V (due to a heavy load) during at least 1 minute. Constant current is applied until absorption voltage is reached (28,4V for a
24V battery).
4.3.2. Absorption
After the absorption voltage has been reached, the charger operates in constant voltage mode.
The recommended absorption time is 2 hours.
4.3.3. Storage
After absorption 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 maximize service life.
4.3.4. 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.
5. MAINTENANCE
This charger does not require any specific maintenance. However an annual check of the battery connections is recommended.
Keep the charger dry, clean and free of dust.
6. TROUBLESHOOTING
Problem
Possible cause
Solution
Charger does not function
The mains is not ok
Measure mains: 180 -265 VAC
Input or output fuses are defective
Return product to your dealer
The battery is not fully charged
A bad battery connection
Check battery connection
The battery select switch is in the wrong
position
Select correct battery type with
rotary switch
Cable losses too high
Use cables with larger cross
section
Use external voltage sensing
The battery is being overcharged
The battery select switch setting is
switch is in the wrong position
Select correct battery type with
rotary switch
A battery cell is defective
Replace battery
Battery temperature too high
Overcharging or fast charging
Connect external temperature
sensor
Failure led on
(see also chapter 9)
Battery voltage too high (> 36 V)
Check all charging equipment
Check cables and connections
Bulk time too long (> 10 hrs)
Possible cell failure, or
higher charge current needed
Temperature in cabinet too high
Check air vents of cabinet
Improve cooling of environment
7. TEMPERATURE COMPENSATION
Figure 7
Float
Absorption
Ba
tt
e
ry
Vo
lt
a
g
e
Battery
temperature
25 °C
50 °C
10 °C
Summary of Contents for Skylla-i 24/100 (1+1)
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