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6. Connections
6.2 Inputs
6.2.1 Current Measurement Inputs
The EAFR-110 has four CT inputs for three-phase current
and earth current measurement. Both phase current and
earth current inputs may be configured to 1 or 5 amps
nominal current input using dipswitches (see Section 3.6:
Dipswitch Settings). For setting current threshold levels
refer to Section 3.5: Current Threshold Setting. An open cir-
cuit detection feature is included, for more details, refer to
Section 5.1: Open CT Monitoring.
6.2.2 Arc Sensor Channels S1, S2, S3, S4, and S5
The EAFR-110P has four arc point sensor channels (S1, S2,
S3, and S4). A maximum three arc point sensors (type
EAFR-01) may be connected to each channel.
The EAFR-110P has an option of one fiber optic loop sensor
channel (S5) with a transceiver and receiver (Tx, Rx). The
function of the S5 channel is controlled by dipswitches (see
Section 3.6). When S5 is configured as a fiber optic loop
sensor, the one end of the fiber sensor is connected to Tx
and another to Rx. This sensor loop is then continuously
monitored by means of a test light pulse traveling through
the loop. In case of discontinuity in the loop, the relay goes
into error mode and activates the ERROR LED and SF relay
output. Alternatively, channel S5 can be configured to con-
trol an arc quenching system. In this case, Tx will be utilized
to control the arc quenching system. The relay is sending
a continuous light pulse to arc quenching system for self-
supervision purposes.
18
EAFR-110 Current and Arc Light Sensor Relay User Manual MN026007EN February 2016 www.eaton.com
The EAFR-110F version has three arc fiber loop sensor chan-
nels (S1, S2, and S3) with a transceiver and receiver (Tx, Rx)
in each channel. Additionally, one transceiver (Tx) is avail-
able for an arc quenching system. For details on sensors,
refer to Section 4: Arc Sensors.
6.2.3 Binary Inputs (BI1 and BI2)
The EAFR-110 contains two binary inputs (BI1 and BI2). The
function of binary inputs is selected using the dipswitches
according to Standard Arc Configurations applications (see
Section 3.6). Typically, binary inputs are utilized for receiving
the arc light information from the EAFR-101 and EAFR-102
units, and receiving the over-current information from the
other EAFR-110 devices.
The inputs are activated by connecting a dc signal exceed-
ing the specified nominal threshold level of the correspond-
ing input. The threshold level is 24Vdc. The actual activa-
tion of the binary input occurs at 80% of the specified
nominal threshold value (i.e.: 19Vdc).
6.3 Auxiliary Voltage
The auxiliary power supply voltage is (110-220) Vac / (125-
250) Vdc.
After powering up, the relay protection is active and opera-
tional within 50 ms.
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