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8.7
Built-in Protection
zappi
has a number of protection features built into the device to make it safe and simple to install.
8.7.1
Loss of PEN Conductor
The Protective Neutral and Earth (PEN) conductor refers to part of the electricity cable to the property. If this
conductor is damaged there is a danger that the chassis of the electric vehicle being charged will become “live”
and cause an electric shock. BS7671:2018 Amendment 1:2020 part 722.411.4.1 requires that extra protection
is provided to prevent an electric shock – either by fitting an extra earth electrode or through a device which
detects the fault and disconnects the supply.
zappi
has this protection built-in
and will disconnect the output if it detects a problem with the PEN conductor
or detects that there may be any electric current flowing through the chassis of the EV. This built-in protection
means that there is no need to install an earth electrode with the
zappi
.
If
zappi
detects a problem with the PEN conductor then the display will show PEN Fault!
To reset the
zappi
, check the continuity of the earth cable and then press the button for three seconds.
8.7.2
Loss of Protective Earth
zappi
can measure the continuity of the protective earth conductor (the earth wire) on the supply cable. If the
earth is disconnected or has a high impedance, then
zappi
will trip and the display will show PE not connected!
To reset the
zappi
, make sure that the fault has been removed and then press the button for three seconds.
8.7.3
Welded Contact
zappi
includes protection to make sure that the supply to an EV is disconnected if there is a problem with the
circuit breaker. This includes a situation where the contacts on the breaker are welded together. This is a
specific requirement of the Renault “Z.E. Ready” and ASEFA “EV Ready” standards (e.g. requirement for
Nissan).
If
zappi
detects a problem with a welded contact, then the display will show RLY WELDED!
If this happens and the fault cannot be reset by pressing the button for three seconds, then please contact
myenergi
8.7.4
Over-current
If there is a problem with the equipment on the EV which charges the vehicle’s battery, too much current may
be drawn from the supply. If this happens,
zappi
cannot control the charge rate as expected and it could lead
to problems with overheating or tripping the main circuit breaker to the
zappi
.
zappi
provides additional protection in accordance with the EV Ready standard by opening its built-in
contactor and isolating the EV if it detects that the vehicle is drawing more than 125% of the maximum current
communicated to it by the
zappi
.
If
zappi
detects an over-current, then the display will show Over Current!
To reset the
zappi
, make sure that the fault has been removed and then press the button for three seconds.
3
Patent Reference GB3577354
Summary of Contents for zappi
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