HVREX_a740 — Impedance Deviation

Full alert identifier: HVREX_a740_ImpedanceDeviation

Alert description

High impedance was detected on one or more bricks.

Potential impact

One or more cells in a brick are likely missing, resulting in a high impedance current path. Other potential causes are a high Direct Current Resistance (DCR), intermittent anode laser weld on the given brick(s), or an islanded brick.

Set condition

Impedance for one or more bricks exceeds the noise threshold for several measurement counts.

Clear condition

All bricks have impedance measurements within the noise threshold.

Signals to check

These diagnostic fields are associated with HVREX_a740. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
Fault Threshold `HVREX_a740_faultThreshold`	Ratio
Max Brick Impedance `HVREX_a740_maxBrickImpedance`	mOhm
Max Normalized Impedance Dev `HVREX_a740_maxNormalizedImpedanceDev`	Ratio
Num Bricks `HVREX_a740_numBricks`	—
Worst Brick ID `HVREX_a740_worstBrickID` 255 SNA	—
Worst Brick Soc `HVREX_a740_worstBrickSoc`	PCT

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of HVREX_a740.