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3.7 Non-volatile Memory
All critical system data including dipswitch settings and the
auto-configuration file described in Section 3.3.1 are stored
in EPROM non-volatile memory to ensure correct operation
and full self-supervision, even if auxiliary power is temporar-
ily lost.
Also all LED indications described in Section 3.3.1 are
stored in non-volatile memory in order to provide quick
recovery of the system status indication even if auxiliary
power is temporarily lost. This feature is especially impor-
tant if auxiliary power is lost after tripping.
Non-volatile memory does not require a power supply to
maintain information and will retain settings and indication
information permanently without power.
4. Arc Sensors
The EAFR-100 series provides the choice of different types
of arc sensors to be utilized in different units and different
switchgear types according to specific application require-
ments. Available sensor types are arc light point sensors
and arc light fiber optic loop sensors.
Arc light point sensors are typically installed in metal clad
compartments providing quick accurate location of the fault-
ed area. Arc light fiber loop sensors are typically installed to
cover a wider protected area with one fiber when no need
for more exact fault location exists.
4.1 Arc Light Point Sensor EAFR-01
The EAFR-01 is an arc light point sensor with a light sensi-
tive photodiode element activated by arc light. EAFR-01 arc
sensors should be mounted in the switchgear cubicles in
such a way that the light sensitive part covers the protected
area as completely as possible. One sensor per closed
metal clad compartment should be utilized. In open spaces,
such as the bus bar section, arc sensors should be mounted
maximum 2 m (6.5 ft) apart.
The factory default set light sensitivity of the EAFR-01 sen-
sor is 8,000 lux. This default set can be also designed as
25,000 and 50,000 lux according to the demand of user's
application. The sensor does not require user settings.
Detection radius is 180 degrees.
EAFR-110 Current and Arc Light Sensor Relay User Manual MN026007EN February 2016 www.eaton.com
Figure 8. Arc Light Point Sensor EAFR-01.
4.1.1 EAFR-01 Installation and Wiring
The EAFR-01 is installed either on the compartment wall
or through the wall. An example of wall mounting is seen
in Figure 9. The EAFR-01 is fixed to the wall using two
screws. The same screw pattern is utilized in through wall
mounting arrangement as well. The relay is turned around
and the eye is pushed to the compartment to be protected.
Two screws are attached from the back side of the sensor.
No external mounting plates are needed in any case.
Figure 9. EAFR-01 Point Sensor Mounted to the
Compartment Wall.
4. Arc Sensors
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