to persist for as long as the corresponding "Deactivation Delay" parameter value for the protection
to be deactivated. When Enable deactivation is activated, this protection will not recover even if its
recovery conditions are met, therefore protection must be reset manually.
The possible value range for the "Activation Delay" and "Deactivation Delay" parameters is from
0 to 600 s with a step of 1 millisecond.
The possible and recommended value range for the ”Activation Threshold" and "Deactivation
Threshold" parameters depend on the corresponding protection type:
•
For "Cell Under-Voltage" and "Cell Over-Voltage" protections both parameters can have a
value from 2.000 to 4.500 V. However recommended values should be set according to dis-
charge and charge cut-off voltage values that are defined in the manufacturer provided speci-
fication sheet of the battery cells used in the battery pack;
•
For "Discharge Over-Current" and "Charge Over-Current" protections the range of possible
values of the "Activation Threshold" parameter is from 0.1 to 800.0 A, depending on the
selected EMUS contactor model;
•
For "External Over-Temperature" parameter can have a value from 20 to 155
°
C. Recom-
mended value is 60
°
C.
•
For "External Under-Temperature" parameter can have a value from -40 to 10
°
C. Recom-
mended value should be set according to minimum operating temperature value that is defined
in the manufacturer provided specification sheet of the battery cells.
The optimal values for these parameters, as well as the necessity of each type of protection should
be assessed according to the design and requirements of the system in which EMUS BMS is used,
or determined experimentally.
3.5
Contactor pre-charge
In a lot of different applications the battery that is managed by EMUS BMS connects to a load that
has a substantial input capacitance. In such case, it is often desirable to limit the high in-rush current
that occurs when the main contactor is closed in order to reduce stress to the internal components
of the load device and prevent the contactor from welding. For that reason, EMUS BMS mini offers
a very straightforward contactor pre-charge feature (not to be confused with “Pre-Charging stage”
that occurs during the charging process).
This feature works by constantly sampling voltage on contactor from load device side while slowly
closing contactor providing small current to pass through. When voltage difference between battery
and load device input capacity is less than 10%, contactor is fully closed.
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