Issue 1.2 May 2020 EVSE Protocol Controller 2.0 (EPC 2.0) | Viridian EV 9
3.7 SEQUENCE OF CHARGING PROCESS
1. INITIALIZATION
Aer the operang voltage is applied, the module carries out inializaons and funcon tests indicated by two LED pulsing
sequences and then waits for vehicle connecon (indicated by pulsing blue LED).
2. CHARGING PROCESS
The module waits for a charging cable or vehicle to be connected (state A) indicated by the blue LED connually pulsing . If an
approved
connecng cable has been connected (see Proximity) and state B is indicated by the vehicle, the module changes the LED to
be steady-blue and acvates the interlock. A connuing ashing White LED will indicate that the lock is obstructed if the
system has been congured for an interlock.
Aer interlocking, the charge-enable relays are acvated if the vehicle is signalling state C. The charging process is acvated,
and the LED is changed to steady-green (LED indicaon : A colour combinaon is used to indicate the rmware version . The
maximum congured charging current is indicated by a series of white pulses ) If state D is indicated (venlaon required)
then charging and interlock are deacvated as the EPC does not provide a fan-enable mechanism, and the LED is changed to
steady-red.
In a fault condion the charge-enable relay and the interlock are deacvated and the LED is changed to connually pulse red.
A slowly pulsing RED LED will require no manual intervenon to restart charging from a fault condion, once the fault has
been idened and cleared . A rapidly pulsing RED LED will require manual intervenon.
VENTILATION REQUIREMENT
WARNING: SUFFOCATION HAZARD WHEN CHARGING INDOORS
Without venlaon, a danger of suocaon can arise due to gas build-up with some baery types when charging indoors. If
the charging process takes place indoors, forced-air venlaon should be installed. The Viridian EV EPC 2.0 does not monitor
the funconality of the forced-air venlaon systems and so are not compable.
CONTROL PILOT
The pilot circuit is used for the bi-direconal exchange of informaon between the charging staon and the vehicle. Via this
signal, the charging staon indicates to the vehicle the maximum permied charging current which the vehicle can call up. The
operaonal readiness of the charging staon is also indicated. Via this signal, the vehicle indicates to the charging staon its
current state of charging readiness.
WARNING
Via the pilot signal, the EPC 2.0 module species the maximum charging current that can be drawn by the vehicle. This
specied current must be consistent with the line protecon congured for the charging device and the rest of the plant
conguraon. Failure to observe this noce can result in injury to persons or property damage.
PROXIMITY
With free cable installaons the charging device detects the maximum current carrying capacity of the connected charging
cable via the proximity signal. The acvated charging output coded in the pilot signal is no greater than the current carrying
capacity of the charging cable.
The EPC 2.0 is designed to operate with available charging current signals of 16A and 32 A ,depending on the current carrying
capacity of the cable that is detected. Note : The adversed current from the EVSE maybe downgraded depending on the
current carrying capacity of the cable detected. . The charging circuit that is acvated must be designed with a suitable line
protecon for 16A for the installed system .For charging cables that have a current carrying capacity of 32A according to IEC
61851 the system must be designed with a suitable line protecon .