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20 Manual Skylla with universal input
4.8 Charging batteries with voltage sensing
When high current runs trough a thin cable between the charger and the battery
there will be a voltage loss in the cables. The charging voltage measured at the
battery poles will be lower than the specified voltage and this will result in a longer
charging time. However, the charger is equipped with a voltage sense facility. The
battery voltage is exactly measured and the charger increases the output voltage
to compensate for the voltage loss across the cables.
The charger can compensate for a maximum of 2V voltage loss over the cables.
When the voltage loss is bigger than 2V the “on” led flashes and the failure led
illuminates. The charge voltage will decrease until the voltage loss becomes
maximum 2 Volt. The “on” led flashes and the failure led illuminates until the
charger is manually switched off. When this occurs the battery cables have to be
replaced because they are too thin or have bad connections.
To install the voltage sense option:
Disconnect the mains.
Connect a red 0,75 mm2 wire to the positive battery pole and the “+Vse”
connector of the charger, see illustration 8.
Connect a black 0,75 mm2 wire between the negative pole of the battery and
the “-Vse” connector of the charger, see illustration 8.
For properly functioning both wires have to be connected.
Switch on the mains.
The “VSE OK” led on the printed circuit board illuminates when connected
correctly. If this led does not illuminate the voltage sense wires are wrongly
connected.
4.9 Intelligent startup
The factory setting of the charger is such that the battery voltage
is checked when the charger is switched on (intelligent startup). In
the case of a flat battery, the charger will start charging in the
boost mode. If the battery voltage is sufficiently high during
charger startup, the charger will be charging in the float mode.
In some situations it may be desirable for the charger not to check
the battery voltage upon startup. With this charger this function is
enabled by sliding dip switch 2 “Watch” to the left.
When this dip switch is positioned on the left, the charger will
always start charging in the boost mode.
When dip switch 2 “Watch” is positioned on the right, it is checked upon startup
whether the battery voltage is sufficiently high to enable a start in the float mode. If
it is not, the charger is started in the boost mode as yet.
Do not use the voltage sense facility in combination with the
diode-splitter compensation, as this will raise the output voltage.
22


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