Category Archives: Problems with Voltages

No cell voltages appear (Orion Jr. BMS)

Common Causes: Incorrect Cell Population Settings BMS is configured with default settings (default settings will show no cell voltages). Cell wiring harnesses not connected to the BMS Cell tap wiring error Internal damage to the BMS Note: If the BMS … Continue reading

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Pack voltage is reading a different voltage than measured by a voltmeter

Possible Causes: In some situations the total pack voltage sensor calibration may drift and produce voltage readings that are higher or lower than the actual pack voltage over time. This only occurs when the BMS is used in applications with … Continue reading

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No cell voltages are showing in the utility

This can be caused by: Incorrect Cell Population Settings A Profile that has not been uploaded to the BMS (i.e. default profile on BMS) Cell wiring harnesses not connected to the BMS Cell tap wiring error Voltages within a cell … Continue reading

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Cell voltages drop after the charge completes

Cell voltages drop after the charge completes. This is often the normal behavior of the cell. A cell’s voltage will rise when it is being charged and will begin to drop somewhat after the charge current has been removed. This … Continue reading

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Not all cell voltages appear in live cell data

This issue can be caused by incorrect cell population settings, wiring errors,, not enough cells in a cell group (wiring error), cell voltages too low, a BMS utility problem, incorrect size of BMS or internal damage to the BMS. Resolving … Continue reading

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Cell voltages appear incorrect (when under load)

When cell voltages are correct while sitting, but appear incorrect when the pack is under load, the cause is usually a loose terminal on a battery, a high impedance connection between two cells (such as a long cable, fuse or … Continue reading

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Cell voltages appear incorrect (not under load)

Almost all cases of voltages showing incorrectly when the pack is not under load are a result of wiring errors (or a result of damage to the BMS unit from previous wiring errors). If one wiring error exists in a … Continue reading

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