Victron energy Lynx Ion Manual page 12

4.8 Using the I/O of the Lynx Ion
The Lynx Ion has several I/O's. The most important are the 'allow-to-charge' and 'allow-to-
discharge' contacts. These are used to control loads and chargers based on the battery
state of charge. See appendix A, connection 'C' for the connections.
These contacts are potential free, and normally open. They are closed when the system is
normally working. If the battery is fully charged the 'allow-to-charge' contact will be opened.
Now the charger knows that it has to stop charging. If it does not stop charging, the safety
contactor will eventually open. This also applies for the 'allow-to-discharge' contact. It is set
open when the battery is fully discharged. All consumers have to stop discharging.
The Lynx Ion has also an 'external contactor output' and a 'bilge pump output'. See
appendix A connection 'B'. The 'external safety contactor' output can be used for switching
an external safety contactor. This contact can switch 10ADC and the output voltage is the
same as the supply voltage of the Lynx Ion. It switches the same way as the internal safety
contactor.
The 'Bilge pump output' can also switch 10ADC and also outputs the supply voltage of the
Lynx Ion. This contact is always on. It only switches off if the Lynx Ion detects an under
voltage alarm.
Switching limits
Contact
Allow-to-charge signal
Allow-to-discharge signal
Internal Safety contactor
External Safety contactor
Bilge pump
Closed / On
When the highest battery
cell voltage drops below
3,32V for 10 sec.
When the lowest battery cell
voltage rises above 3,35V
for 10 sec.
When all cell voltages are
between 2,60V and 3,62V.
Same as internal safety contactor
After a system reset.
Open / Off
When one battery cell
voltage reaches 3,52V for
10 sec.
When one battery cell
voltage drops below 2,8V
for 10 sec.
When one of the cell
voltages is above 3,62V or
below 2,60V for 20 sec.
When one cell voltage
drops below 2,4V.
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