CCS Signaling Proximity Pilot function

Proximity Pilot

The proximity pin, PP (also known as plug present), as shown in the SAE J1772 example pinout, describes the switch, S3, as being mechanically linked to the connector latch release actuator. During charging, the EVSE side connects the PP–PE loop via S3 and a 150 Ω R6; when opening the release actuator a 330 Ω R7 is added in the PP–PE loop on the EVSE side which gives a voltage shift on the line to allow the electric vehicle to initiate a controlled shut off prior to actual disconnection of the charge power pins. However, many low-power adapter cables do not offer that locking actuator state detection on the PP pin.

Under IEC 62196 the Proximity Pin is also used to indicate the cable capacity – this is relevant for non-tethered EVSEs.

The resistor is coded to the maximum current capability of the cable assembly. The EV interrupts the current supply if the current capability of the cable is exceeded as detected by the measurement of the Rc (shown as R6 in the J1772 signaling circuit above), as defined by the values for the recommended interpretation range.

Rc is placed between the PP and PE, within the detachable cable assembly.