The world changes. It is inevitable. It is often a steady evolution, but at times sudden changes occur that lead to new scenarios in just a short time. The introduction of electric vehicles on the market entails the creation of new habits, new structures, and new needs. In such an evolving context, it is important to establish points of reference that guide the change; in this case, the more qualified, and thus credible, figure becomes the main player. SCAME did not hesitate for a second to offer a tangible and functional contribution in order to achieve sustainable choices from a technological, economic and environmental standpoint. A considerable commitment, which SCAME has gladly been devoted to for many years, with the aim of providing tomorrow’s drivers with practical and safe instruments.
In Europe, there are many technicians with experience and skills, but in order to make the most of this wealth it was necessary to find a way to coordinate the work being carried out, channel choices and share objectives. SCAME, in conjunction with other manufacturers strive to ensure compliance of connections used to supply electrical vehicles with IEC/CENELEC standards. All the efforts were geared towards setting up a European connecting standard capable of guaranteeing the highest levels of safety.
European standards define possible cases for electric vehicle connection to the source of power. Within the standardization activities, SCAME has elected to develop its products by presenting original and groundbreaking solutions on the topic of safety that have been appreciated and considered as reference standards at the European level. SCAME thus received proper recognition for the valuable expertise gained while developing its range of products with innovative spirit and designing ability.
IEC/EN 61851-1: CHARGING METHODS The reference standard for EV charging stations is the IEC/EN 61851-1, which describes four charging modes:
Connection of the EV to the a.c. mains using domestic connectors up to 16 A, type A 30 mA RCD (Residual Current Device) protection in upstream.
Connection of the EV to the a.c. mains using domestic or industrial connectors up to 32 A, type A 30 mA RCD protection, control device on the cable (ICCB In-Cable Control Box).
Connection of the EV to the a.c. mains with dedicated connectors, type A 30 mA RCD protection, control device in the charging station.
Connection of the EV to the a.c. mains with off-board battery charger.
Moreover, depending on the type of cable connection, there are three different possible cases:
EV connection to the a.c. mains using a supply cable and plug permanently attached to the EV.
EV connection to the a.c. mains using a detachable cable equipped with plug and socke.
EV connection to the a.c. mains using cable and socket permanently attached to the charging station.
The reference standards for Mode 3 connectors are the IEC/EN 62196-1 and 2, and they describe three different types of connection:
While contributing to defining the new standards, SCAME put technology at the service of common sense, with the aim of pursuing practical and intelligent design choices. Indeed, the choices made when defining connection methods and designing the relevant equipment have led to the offer of simple and safe products. This means that the utilization methods are perfectly suited to the user, that production costs are low and that safety is ensured.
SCAME’s charging stations use charging mode 3, in accordance with IEC / EN 61851-1. Charging mode 3 consists in connecting the vehicle to the AC mains using specific connectors and with a control pilot circuit inside the charging station to verify continuity of the protective conductor between vehicle and grid during the charging. This check is necessary to ensure proper operation of protections against indirect contacts, hence to prevent any dangerous voltage from being discharged through accidental contact with unaware persons; it is usually mandatory for vehicles with power above 3 kW, and, in Italy, for public or private environments open to third parties. The control circuit also arranges for communication between charging station and vehicle (PWM Circuit) and for cable size identification (Resistor Coding).
PWM circuit operation is described in Annex A of standard IEC/EN 61851-1. This circuit arranges for communication between charging station and electric vehicle: the station communicates the supply network availability to the vehicle through a frequency-modulated signal, the vehicle adjusts the load returning its status through a voltage value.
In the case of vehicles without PWM, the circuit operates in "simplified mode", measuring the earth resistance value only and limiting the charging current to 16 A (10 A in the future).
Resistor Coding operation is described in Annex B.5 of standard IEC / EN 61851-1 and it is mandatory in the case of 3C type connectors, type 1 and type 2, when it is possible to wire the plug using cables with different cross-sections and current carrying capability. Depending on the max charging current, a resistance is positioned between the PP contact and the earth, with a value that identifies cable size. The PWM circuit then checks that the charging current does not exceed the maximum drawable current.
ZE READY LABEL is a quality brand owned by Renault that guarantees full compatibility of the charging infrastructure with ZE Renault vehicles. When affixed, it ensures that the charging stations and their installation, are carried out in compliance with specific requirements established by the members of the ZE Ready workshop, which anticipate upcoming rules and regulations concerning the charging of electric vehicles in order to ensure their safety and performance. ZE READY is a trademark granted by Renault to accredited partners. The right to use the trademark is only given to companies that have control over the product and its installation. SCAME stations have been tested and accredited in conformity with ZE READY 1.2 requirements, so any installer that wishes to successfully comply with ZE READY expectations can become SCAME’s partner. For more information about SCAME products, the certification process and how to become a partner, please contact firstname.lastname@example.org
Our charging stations are equipped with a control card that was developed in cooperation with our partner, GENERALE SISTEMI, which supplies basic functions such as PWM circuit, resistor coding, energy measurement, RFID user identification, indicator lights and RS485 serial communication. Depending on the versions, additional functions such as emergency power supply, display management, anti-extraction locking and lights command are provided by a special expansion module.