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DTC P0A04 - Open Wiring Fault
Orion Product
Orion BMS [Original] (24 - 180 Cell)
Orion BMS 2 (24 - 180 Cell)
Orion JR (16 Cell)
FAULT DESCRIPTION
This fault is a serious code that effectively disables the BMS and often causes
many other fault codes to occur. When diagnosing errors, this error code should be
corrected first.
This error code indicates that the BMS has determined that a cell tap wire is either weakly
connected or not connected and as a result, it has determined that it cannot accurately
measure cell voltages. Wiring faults can be caused by improperly wired cell taps, loose cell
tap connection, cell taps that are not connected to the battery, internal fuses blown inside
the BMS or other internal damage to the BMS from previous improper wiring.
In order to detect this condition, the BMS will periodically place a very small pulse of current
on the tap wire and measuring the voltage drop of the wire. This is an important test for the
BMS to perform regularly as the protection diodes inside the BMS may cause the cell
voltages to appear roughly normal when a cell tap wire may in fact be open or
disconnected. When voltages are inaccurate due to an open wire, one cell voltage usually
rises while the adjacent cell voltage drops. One cell voltage reading high while the adjacent
cell reads low is a typical sign of an open wire fault.
For more information on what causes fuses within the BMS to be damaged,
please see
W hy Orion BMS Internal Fuses Blow
Document Revision: 1.0
Last Updated: 1/9/2018
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 DTC P0A04 - Open Wiring Fault Orion Product Fault Supported Orion BMS [Original] (24 - 180 Cell) Orion BMS 2 (24 - 180 Cell) Orion JR (16 Cell) FAULT DESCRIPTION This fault is a serious code that effectively disables the BMS and often causes many other fault codes to occur.
- Page 2 BMS unit. Note: T he Orion BMS scans for this fault condition at set intervals and it may take several minutes for this error to show up depending on the severity of the fault condition. This is especially true if a wire has a high impedance connection or is intermittently failing.
- Page 3 Orion BMS and cannot be trusted when this error message is present. FAULT THRESHOLDS Fault will trigger when A NY o f the following conditions are satisfied (a) An open wire fault is consistently detected by the BMS.
- Page 4 41) then the problem is with the wiring itself. If the problem remains on the same cell despite swapping the affected connector, the Document Revision: 1.0 Ewert Energy Systems, Inc 161 E. St Charles Rd. Carol Stream, IL 60188 Last Updated: 1/9/2018...
- Page 5 A dditionally this freeze frame data may be requested by Technical Support if further assistance is required. Document Revision: 1.0 Ewert Energy Systems, Inc 161 E. St Charles Rd. Carol Stream, IL 60188 Last Updated: 1/9/2018 Phone: (630) 868-3173...
- Page 6 Steps to download the Freeze Frame: 1) Connect to the BMS using the Orion BMS utility. 2) Click the “Diagnostic Trouble Codes” tab at the top. 3) Select the correct fault code by clicking on the ID on the left side of the screen to initiate the Freeze Frame retrieval.
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