I have a question about the fix of adding thermostatic switches to the J1772 connector to open the proximity line. Does this affect drive-off protection?
The reference circuit shows that the EVSE normally grounds the proximity pin through a 150 ohm resistor, increasing this to 480 ohms (by inserting 330 ohms) when the release button is pushed. The 330 ohm resistor on the thermostatic switches would have this same effect. Does 480 ohms mean "Stop charging, but I'm still connected so don't drive away just yet?"
And what if you push and hold the button while the thermostatic switches are open? That would apply 150 + 330 + 330 = 810 ohms to the proximity pin. Of course, you're unlikely to try to move the car while you've got your hand on the charging plug...unless somebody else does it...
The reference circuit shows that the EVSE normally grounds the proximity pin through a 150 ohm resistor, increasing this to 480 ohms (by inserting 330 ohms) when the release button is pushed. The 330 ohm resistor on the thermostatic switches would have this same effect. Does 480 ohms mean "Stop charging, but I'm still connected so don't drive away just yet?"
And what if you push and hold the button while the thermostatic switches are open? That would apply 150 + 330 + 330 = 810 ohms to the proximity pin. Of course, you're unlikely to try to move the car while you've got your hand on the charging plug...unless somebody else does it...