PK350 isolation fault

How it presents

Display

PK350 isolation fault

OCPP

Faulted (StatusNotification) — capture errorCode/info

Symptom

PK350 isolation fault on tritium (pk350): Tritium dispenser UI / RTM or PK service LED shows TRI-PK-ISO. Techs see session abort or stall Unavailable until the ranked cause is cleared. Correlate Tritium Veefil / OCPP vendor DataTransfer if enabled before opening the cabinet.

Root causes (by observed frequency)

1. #1 Cable or gun insulation breakdown presenting as TRI-PK-ISO

   Swap known-good cooled/uncooled cable before condemning power stage

2. #2 Coolant contamination or leak wetting DC bus sensors
3. #3 Y-cap / filter path degraded after surge or grid event

Diagnostic procedure

1. 1. Capture Tritium dispenser UI / RTM or PK service LED message for TRI-PK-ISO, connector ID, and last successful session time

   Expected: Exact display string + OCPP status/errorInfo if present

   Tools: phone photos (scrubbed), CSMS

2. 2. Pull Tritium Veefil / OCPP vendor DataTransfer if enabled; confirm whether PK350 isolation fault follows one gun, one cabinet, or the whole site

   Expected: Fault correlates to one path

   Tools: CSMS export, OEM cloud

3. 3. On model pk350 hardware, isolate power quality / protective devices before opening HV for TRI-PK-ISO

   Expected: Voltage in band; no unexpected trips

   Tools: DMM, IR gun, LOTO kit

4. 4. Execute rank-1 cause check for “PK350 isolation fault”; swap known-good cable/gun or stall if available

   Expected: Fault moves with cable or stays with cabinet

   Tools: known-good cable, IR, OEM service menu

5. 5. If unresolved, escalate with TRI-PK-ISO evidence pack (HMI photo, OCPP snippet, readings) — PK liquid-cooled path vs RTM air-cooled path changes isolation and thermal triage

   Tools: ticket template

The fix

Clear TRI-PK-ISO (PK350 isolation fault) by correcting the ranked cause on tritium / pk350, then run a full validation session.

• Suspect module or controller indicated by rank-1 cause

  OEM tritium service channel; keep serial for RMA

  TRI-PK-ISO

1. LOTO and verify zero energy per tritium HV procedure before any bus work
2. Correct rank-1 cause for TRI-PK-ISO; do not shotgun-replace modules
3. Clear fault latches in HMI/CSMS; confirm StatusNotification returns to Available/Preparing as appropriate
4. Run validation: authorize → handshake → ≥5 minutes energy → clean stop; capture MeterValues
5. Document firmware, part lots, and scrubbed HMI photos for confirmations