120A 12V-24V Cyrix-Li Charge Battery Combiner - Victron Energy

Description

• shutting down charging in case of imminent under-voltage on the cells, and
• stopping and reducing charging current in case of imminent over-voltage on the cells, high (>50°C) or low (<0°C) temperature.

The VE.Bus BMS is the core of the second line of protection.
However, neither all loads nor all chargers can be directly controlled by the VE.Bus BMS.
To turn off these loads or chargers, several Cyrix switches controllable by the VE.Bus BMS are available: Cyrix-Li-load.

Cyrix-Li-Charge

The Cyrix-Li-Charge will connect a battery charger with a 3-second delay:

• if the VE.Bus BMS disconnect output is high, and
• if it measures 13.7 V (27.4 V or 54.8 V respectively) or more on its battery charger connection terminal, and
• if it measures 2 V or more on its battery terminals (the Cyrix will remain open if not connected to the battery).

The Cyrix-Li-Charge will deactivate immediately if its control input becomes floating, indicating over-voltage or overheating on the cells.
Generally, a cell over-voltage alarm will reset shortly after the charging process stops. The Cyrix will then reconnect the charger after a 3-second delay. After 2 reactivation attempts with a 3-second delay, the delay will increase to 10 minutes.
If the battery voltage is below 13.5 V (27 or 54 V respectively), the Cyrix will deactivate with a one-hour delay.
Note 1: In case of zero discharge current, or reduced discharge current, the Cyrix will not deactivate immediately after the charger stops and/or disconnects because the battery voltage will remain above 13.5 V.
Note 2: If, after the Cyrix deactivates, the battery charger output immediately increases to 13.7 V or more, the Cyrix will reactivate after a three-second delay.

An integrated transient voltage suppressor will limit voltage spikes that may occur when the Cyrix suddenly deactivates due to over-voltage or cell overheating.