EV Charger Programming Jig and Provisioning

What the station applies

Applying a value and confirming it took are different operations. Only the second is evidence, which is why every item above is read back and compared rather than assumed to have written successfully.

Identity is not a serial sticker

A serial number identifies the unit to you. Backend credentials let the unit assert that identity to a system that will trust it. Those are different problems with different failure modes.

• Credentials must be unique per unit, not shared across a batch
• The credential source needs access control, because the station can mint trusted identities
• Failed or scrapped units need their credentials revoked, not merely discarded
• Reworked units must not acquire a second identity while retaining the first

The scrapped-unit case is the one most often missed. A board that fails final test after provisioning still holds a valid credential, and if the disposal route does not revoke it, that credential leaves the factory.

Fixture design

The fixture presents the programming interface reliably across thousands of insertions, holds the unit in a repeatable position, and fails in a safe state if the cycle is interrupted. Contact wear is the dominant maintenance item, and a degrading contact produces intermittent programming failures that look like firmware faults.

Version compatibility

Programming software is versioned against product revisions. A fixture must not be able to load a build intended for a different variant, because the resulting unit will pass its immediate checks and behave incorrectly in service.

This is enforced at the station rather than by procedure. A control that depends on an operator selecting the right menu item will eventually fail on a busy shift.

Records

Each cycle records the serial, the firmware version and hash, the configuration applied, the station, the operator and the timestamp. That record is what lets you scope a firmware problem to a date range and a station rather than to an entire production run.

Where this sits relative to end-of-line test

Programming and end-of-line test are separate stations with separate purposes. Programming makes the unit what it is meant to be. End-of-line test proves that it is. Combining them into one step saves floor space and removes the independent check, which is a poor trade at any volume.

How we work with you on this

Programming and provisioning touch your security posture, so this is built with your team rather than dropped in. Key handling, certificate provisioning and who holds what are decisions you should make and understand, not decisions a supplier should quietly make for you.

Our engineers set it up on site and stay through the first production runs. Afterwards it sits under the same monthly support arrangement as the rest of the line.

What an automated jig does

1. 1

   Tests and evaluates

   The unit is exercised rather than inspected, so a fault is caught on the line instead of at a customer site.

2. 2

   Programs

   Firmware loaded and verified, at takt, without an engineer with a cable.

3. 3

   Provisions

   Identity, keys and configuration written as a controlled production step rather than as something done afterwards.

4. 4

   Logs

   Every result recorded against the unit's serial number, in the product lifecycle system.

The manpower saving is the obvious benefit. The record is the one that pays off later.

Why the log matters more than the test

A test that passes and is not recorded proves nothing three years later, which is exactly when an auditor asks.

Results are written into the product lifecycle management system, which in our own operation is the S3 suite. When a unit returns from the field, its full production record is retrievable: what was tested, what the readings were, which firmware it left with, which components were fitted. That turns a field failure from a guess into an analysis, and it is also what a customer auditing your line will ask to see.

How we build it for you

Jigs are designed to your product and your line rather than supplied from a catalogue. The feature set comes from what you need tested and what your process requires, and the work sits inside a wider manufacturing programme rather than standing alone.

Our engineers build it with your production and quality teams and stay through the first runs, because test limits get revised once a line starts generating real data.