Eagle Premium IGBT – Charge curve options:

Charge curve: IUa (gel-cell), IUIa (traction lead-acid), IU1U2a (stationary) - IUIUa (maintenance free);

IUa (gel-cell): This type of charge curve must be used with batteries having a precise maximum voltage limit (gel-cell, sealed type batteries).

The first part of the charge is done at constant current ("bulk current"). When the battery voltage reaches a defined value, the charge continues at constant voltage ("float voltage"), as can be seen in the diagram.

The constant voltage phase can be stopped at a defined time, or continued without limit.

IUIa (traction lead-acid): The IUIa charge curve is ideal for lead-acid batteries used in heavy-duty applications.

The first part of the charge is done at constant current ("bulk current"). When the battery voltage reaches a defined value (normally the gassing voltage), the charge continues at constant voltage while the current decreases.

When the current reaches the defined final charge value, the charge continues at constant current, while the voltage can increase freely, until the charge is stopped by the controller.

IUIUa (Maintenance Free): The IUIUa charge curve is ideal for lead-acid batteries used in heavy-duty applications, and can be used with traction maintenance-free batteries.

The first part of the charge is done at constant current ("bulk current"). When the battery voltage reaches a defined value (normally the gassing voltage), the charge continues at constant voltage while the current decreases.

When the current reaches the defined final charge value, the charge continues at constant current, while the voltage increases.

When the voltage reaches a second threshold value, the charge continues at constant voltage to the end.

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