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DTC P0AFA - Low Cell Voltage Fault
Product Family
Orion BMS [Original] (24 - 180 Cell)
Orion BMS 2 (24 - 180 Cell)
Orion JR (16 Cell)
FAULT DESCRIPTION
This fault code is triggered when the voltage of a cell falls below 0.09 volts (90 mV). This fault can be
caused by a cell that is incorrectly set in the BMS profile as a "populated" cell, a disconnected cell wiring
harness, a very dead cell, or a wiring error. It can also indicate two or more cell voltage tap wires are
connected backwards.
IMPORTANT WARNING: If cell voltage tap wires are backwards, the cell voltage tap connectors
should be immediately disconnected from the BMS unit until the issue is corrected as permanent
damage may occur to the unit and may drain the attached cells damaging them.
NEVER LEAVE A DAMAGED ORION BMS UNIT CONNECTED TO THE BATTERY PACK.
SAFETY WARNING: C ells which have been over-charged or over-discharged may not be safe to
use even after bringing the voltage into a correct range. A cell which has previously been
over-charged or over-discharged at any time may develop internal damage, compromising the
safety of the cell. Always consult the cell manufacturer for advice on whether a cell can be safely
used after an over-charge or over-discharge event.
Document Revision: 1.0
Last Updated: 10/18/2017
Fault Supported
YES
YES
YES
Ewert Energy Systems, Inc
161 E. St Charles Rd. Carol Stream, IL 60188
Phone: (630) 868-3173
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Summary of Contents for Ewert Energy Systems Orion BMS
- Page 1 NEVER LEAVE A DAMAGED ORION BMS UNIT CONNECTED TO THE BATTERY PACK. SAFETY WARNING: C ells which have been over-charged or over-discharged may not be safe to use even after bringing the voltage into a correct range.
- Page 2 The BMS will categorize which cells (by cell ID number) are registering this fault code. Steps to view the list of Low Cell IDs: 1) Connect to the BMS using the Orion BMS utility. 2) Click the “Diagnostic Trouble Codes” tab at the top. Document Revision: 1.0 Ewert Energy Systems, Inc 161 E.
- Page 3 Determine if the affected cells are supposed to be monitored. The Orion BMS is sold in increments of 12 cells, and most applications do not have exactly the same number of cells that the BMS supports. Because of this, the BMS must be told which cells are connected, or “populated.”...
- Page 4 Note that even though the Orion BMS units only have certain cell groups populated internally according to the size unit purchased. Taps connected to cell groups that are “unpopulated” internally are ignored. If the cell voltage tap connectors are not connected in the proper order, or were connected after the unit was powered up, reseat the connectors and clear the error codes using the Orion BMS utility.
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