easee RDC-DD Charge Lite Instruction Manual
- June 24, 2024
- easee
Table of Contents
easee RDC-DD Charge Lite
Specifications
- Standard: IEC 60364, IEC 62955
- Residual Current Protection: RCD Type A with RDC-DD
- DC Fault Current Threshold: 6 mA
- Disconnection Time Testing: at startup, between each session, or at least every 24 hours
- Maximum Disconnection Times: Refer to Table 1
- Critical Fault Mode: Audio and visual signals, non-resettable by user
- Temperature Monitoring: Internal sensors for automatic shutdown at a predefined limit.
RDC-DD Functional Description
Content
Technical documentation of residual current protection
in accordance with IEC 60364, for charging station Easee
Charge Lite.
Summary
IEC 60364-7-722:2018 describes methods for residual current
protection. The charging station uses the following method:
- The use of an RCD type A in conjunction with a residual direct current detecting device (RDC-DD) complying with IEC 62955 Easee ASA declares that the charging station will disconnect the power supply if DC fault current exceeds 6 mA. In combination with a fixed installation RCD Type A, this will provide equivalent or higher protection compared to an RCD Type B. This document is a functional description of how the charging station provides protection in accordance with IEC 60364:2018. The document contains excerpts from the technical documentation made available for TÜV Rheinland, and that has been used as the basis for testing and type certification in accordance with EN IEC 61851-1: 2019.
Residual current protection
In the charging station, RCD protection is integrated into the Chargeberry,
which is part of the product composition. The harging station shall be
installed with an external RCD Type A in the fixed installation. The charging
station contains equipment for detection of DC residual currents (RDC-DD) in
accordance with IEC 62955. Disconnection in the event of DC fault currents
above 6 mA is ensured through a common switch, which breaks the control
current to all the internal relays for simultaneous opening. The internal DC
fault protection is automatically tested at startup, between each charging
session or at least every 24 hours. The disconnection times are faster than
using a modular Type B device. In cases where a ground fault is detected, the
LED indicator on the charging station will turn red, all relays will open,
thus isolating the output to the Type-2 connector. The RCD is reset by
disconnecting the charging cable. When the Type-2 connector is not connected
to both the charging station and the electric vehicle, all relay contacts are
always open.
The disconnection times for ground faults comply with the requirements in IEC 60364-4-41, section 411.3.2.2, for TN-, TT-, and IT-supply systems. The disconnection time for IT supply in Table 1 is derived from Norwegian standard NEK 400, based on IEC 60364.
Technical design
Table 2 provides an overview of the main requirements for the standards used,
and performance parameters for Charge Lite.
Critical fault mode alarm
In the event of a voltage error on the vehicle, voltage error due to a ground
fault, or relay error, the charging station will enter critical fault mode
with audio and visual signals and will not be usable. The critical fault mode
cannot be reset by the user but must be examined by Easee support. In the
event of a critical fault mode, the opening of relays will be ensured through
two separate systems, thereby providing redundancy and increased safety before
or during an ongoing charging session.
Temperature monitoring
The charging station is equipped with internal temperature sensors that
initiate actions in response to unexpected temperature rises. Should the
temperature exceed a predefined safety limit will the charging station
automatically shut down to prevent overheating, and the user will receive a
notification.
Product Usage Instructions
Residual Current Protection
The charging station uses RCD Type A with RDC-DD for residual current
protection. The DC fault protection is automatically tested and will
disconnect the power supply if the fault current exceeds 6 mA.
Ground Fault Detection
If a ground fault is detected, the LED indicator will turn red, all relays
will open, isolating the output to the Type-2 connector. Reset the RCD by
disconnecting the charging cable.
Critical Fault Mode
In case of a critical fault mode due to voltage error or relay error, the
station will enter a critical fault mode with audio and visual signals.
Contact Easee support for examination.
Temperature Monitoring
The station has internal temperature sensors to prevent overheating. If the
temperature exceeds the safety limit, the station will shut down
automatically..
Technical performance and design parameters
An RCD detection module is used to detect both AC and DC fault currents. An additional fault signal will be active if an internal error is detected in the module. Any of the three fault signals will cause all relays to open, thereby isolating the Type-2 connector from the input current, including the neutral conductor.
Function
The opening of relays in the event of a ground fault is designed as a dual-
channel system to provide redundancy and thereby increase reliability in case
of failure. A ground fault can be indicated by the sensor, whether it is a
fault current of 6 milliamperes direct current (DC), 30 milliamperes
alternating current (AC), or a fault in the sensor itself. When such a fault
is detected, signals are sent to both a Microcontroller Unit (MCU) and a
Complex Programmable Logic Device (CPLD). These two units will immediately
open all relays by disconnecting the 12-volt control voltage to the relays.
This is done through their own, separate breaking circuits, which are
connected in series and controlled completely independently of each other.
This means that in the event of a fault in the MCU unit or its software (SW),
the CPLD unit will still open the relays. Similarly, if a fault occurs in the
CPLD unit, the MCU unit will still ensure that the relays are opened. This
system ensures that a ground fault will always lead to the relays being
opened, even if one of the channels fails, thereby significantly increasing
safety.
The purpose of this document is to describe the ground fault protection for the charging station, to achieve safety levels in accordance with IEC 60364:2018. Easee asserts that the information in this document is correct. Beyond this, Easee ASA, or its subsidiaries, do not assume any responsibility related to the use of the information in the document. No part of this publication may be republished, reproduced, transmitted, or reused in any other form, by any means or in any format, for your own or third-party use, unless otherwise agreed in writing with Easee or its subsidiaries. Any permitted use must always be in accordance with good practice and ensure that no harm can be done to Easee, or by misleading the consumer. Easee and Easee products, product names, trademarks, and slogans, whether registered or not, are the intellectual property of Easee and may not be used without Easee’s prior written permission. All other mentioned products and services may be trademarks or service marks of their respective owners. May 2024 – Version 1.00 © 2024 by Easee ASA. All rights reserved.
FAQ (Frequently Asked Questions)
Q: How often should the DC fault protection be tested?
A: The internal DC fault protection is automatically tested at startup,
between each charging session, or at least every 24 hours.
Q: What should I do if the LED indicator turns red?
A: If the LED indicator turns red, it indicates a ground fault. Disconnect the
charging cable to reset the RCD.
Q: How to handle a critical fault mode?
A: In case of a critical fault mode, contact Easee support for examination as
it cannot be reset by the user.
Q: What happens if the temperature exceeds the safety limit?
A: If the temperature exceeds the safety limit, the charging station will
automatically shut down to prevent overheating, and you will receive a
notification.
Easee ASA
Vassbotnen 23
4033 Stavanger, Norway
www.easee.com
References
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