BS EN 61851-1-2001 pdf download.Electric vehicle conductive charging system Part l : General requirements.
B.2 System start-up sequence
To prevent damage to the EVSE and coupler and provide for a safe and orderly start-up of the charge process, the complete sequence of control events for modes 2, 3, and 4 charging is described below and must be followed in the design of the charging system. For charging to proceed, the following sequence of control events must take place.
B.2.1 Proximity detection
Upon initial insertion of the connector into the vehicle inlet and before any electrical contact is established, the vehicle shall provide a means to detect the presence of the connector at the point where damage could occur to the coupler if the vehicle were moved. The means shall provide a signal to activate the vehicle control system and interlock the vehicle drive system.
8.2.2 Verification that the vehicle Is properly connected
The EVSE verifies that the connector is properly connected to an EV by sensing the resistance of R3 in figure B.1.
8.2.3 Continuous protective earth conductor integrity checking
The vehicle protective earth connection provides a return path for the control pilot current. Therefore, the protective earth between the EVSE and the EV is continuously verified if current flows on the pilot line.
B.2.4 Energization of the system
Upon establishing electrical contact with the vehicle and optionally receiving a manual start command, the EVSE performs internal checks. If no fault conditions exist and any installed off-peak time delay has expired, the infrastructure control pilot switch (Si) is closed and an oscillator signal is provided to the vehicle to indicate that the infrastructure is ready to supply energy. When the vehicle senses the oscillator control pilot signal, the vehicle performs internal charge ready checks (i.e. vehicle in park, etc.). At the completion of the internal checks, the vehicle signals that it is ready to accept energy by closing the control pilot switch (S2), thus providing continuity in the control pilot and equipment earth circuit. Proceed to step 5.
B.2.5 Supply rating recognition by the vehicle
The vehicle is able to determine the continuous rated current rating of the EVSE by integrating the duty cycle of the oscillator signal per figure 8.3. If the duty cycle is between 5 % and 80 % ± 2 % indicating that an onboard charger is to be used, serial data communication may now be established, the process should proceed to close Its main power contactor and the charging system is energized. lithe duty cycle is (90 ± 2) %, indicating that an off-board charger will be used, serial data communication must be established prior to proceeding to close its main power contactor, and the charging system is energized. If serial data communication cannot be established, the process must be terminated at this point and the fault condition displayed to the operator. The onboard vehicle charger may now draw power at up to the rated maximum continuous current rating of the EVSE, or the maximum current rating of the EVSE for continuous rated loads or as established by serial data communications for off-board charging.
B.2.6 De-energization of the system
The conditions specified in steps 1 through 4 must be continuously monitored during the charge process. If any of the conditions in steps I through 4 do not satisfy the specified requirements, the EVSE must terminate the charge process by opening the main contactor and SI and may display the fault condition
B.2.7 Determination of ventilation requirements of the charging area (optional)
With the control pilot continuity established the following system status information can be derived. The infrastructure is able to determine whether the vehicle requires indoor charging area ventilation. If the vehicle does not require indoor area ventilation, the system may be energized. If the vehicle does require indoor area ventilation, then three conditions can exist.
— Condition I — lithe EVSE is suitable for indoor charging of all vehicles, the charging area ventilation system is energized before energizing the system.
— Condition 2 — If the EVSE is suitable for outdoor charging of all vehicles, the system may be energized.BS EN 61851-1-2001 pdf download.