User Manual

Ground Fault Circuit Interruption
Integrated ground fault circuit interruption (GFCI) protection automatically detects a current mismatch
between power delivery conductors that would indicate that current is flowing through the ground (PE)
conductor.
If a ground fault occurs after 10 seconds of charging, Wall Connector will wait 15 minutes before
automatically re-attempting to charge. Up to four attempts to charge will be made before user interaction is
required.
If a residual current fault occurs within 10 seconds of charging, Wall Connector will lock out and user
interaction is required to restore charging functionality.
Recommended interaction includes pressing the button on the charging handle, or removing the charging
handle from the vehicle and reinserting it. If this does not resolve the issue, look for a ground fault issue such
as water ingress.
Ground Assurance
Wall Connector continuously checks for the presence of a safe ground connection and automatically
recovers from faults. Grounded assurance operates by injecting a small amount of current into the ground
conductor in order to measure the impedance between line and ground. If high impedance is detected, the
Wall Connector will lock out charging and display a fault code of two (2) red blinks. See Fault Codes on page
38 for a full list of fault codes.
For ground assurance to operate on TN grids, one leg of the distribution transformer must be ground-
bonded (Neutral). Ground bond should only occur at one location in a site's electrical system.
Wall Connector ground assurance may be adjusted in countries with TT or IT grid configurations and can be
disabled in the commissioning procedure.
The Ground Monitor Interrupter feature monitors the Wall Connector ground connection. Select the correct
option based on the installation's earthing system and earth impedance.
Depending on country, three options are available:
• Enable: Ground connection will be monitored and a high detected ground resistance will disable the
Wall Connector. This is the preferred setting to provide protection, and should be selected where
ground connection is expected to be strong (as in the case on TN networks and most TT networks),
and where required by regulation.
• Monitor: Ground connection will be monitored but a high detected ground resistance will not disable
the Wall Connector. This should be selected if the ground monitoring check yields false positives and
ground impedance cannot be improved (as is the case in some TT networks).
• Disabled: Ground connection will not be monitored. This should be selected where the ground
connection is not made (as is the case for IT networks), or where the current induced by this check
would be problematic (as is the case on some TT networks with sensitive residual-current devices).
NOTE: Ground Monitoring is always enabled for installations in North America.
Temporary problems such as ground faults or utility power surges are resolved automatically.
PRODUCT OVERVIEW
12Gen 3 Wall Connector Manual