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Figure 17. EAFR-01 Sensor Connection Step 8.
9.
A maximum amount of three arc sensors can be daisy-
chained to the same sensor input on the EAFR-101
relay (see Figure 18).
Figure 18. EAFR-01 Sensor Connection Step 9.
The Auto Configuration is a part of the Self Supervision
Function which ensures that all connections and sensors are
fully functional and ready to operate at all times.
5. System Self-supervision
The EAFR-101 includes an extensive self-supervision fea-
ture. Self-supervision includes both internal functions and
external connections. The self-supervision module monitors
power supply, hardware and software malfunctions, and
binary input connection and sensor problems. Dipswitch
settings are also supervised by comparing the actual value
with stored non-volatile memory data (see Section 3.3.1:
Auto Configuration [System Setup]).
In a healthy condition, the POWER LED is on and the
System Failure (SF) relay is energized. If the self-supervi-
sion function detects a faulty condition or the power supply
fails, the self-supervision relay is released and the ERROR
LED is illuminated.
EAFR-101 Arc Point Sensor Relay User Manual MN026004EN February 2016 www.eaton.com
If a sensor failure occurs, the relay will go into the ERROR
mode. The ERROR LED will turn on, the SF relay will de-
energize, and the corresponding faulty sensor channel LED
will start blinking. In this situation, the relay is still in protec-
tion mode, but with the faulty sensor channel blocked. If
the error is resolved, the relay will automatically clear the
SF-status. This means that the SF relay will energize and
the ERROR LED will turn off. If one or more of the sensors
are disconnected, the healthy sensors remain in use and the
relay remains operational. The EAFR-101 will remain in Error
mode until the disconnected sensors are repaired.
If a dipswitch setting is changed after the auto-configuration
function (see Section 3.3.1: Auto Configuration) has been
executed, the relay will go into SF alarm mode. The con-
figured (stored) setting is however still valid and the relay is
still operational.
6. Application Examples
The EAFR-101 may be applied to a variety of power switch-
gear and control gear layouts and technologies. Some typi-
cal applications are described in this section. Please consult
your nearest Eaton representative for a solution to your
particular application.
6.1 MV or LV Application with Current and Light
Condition
The EAFR-101 may be applied requiring both over-current
and arc light conditions for trip. In this application, tripping
is performed only if both conditions are fulfilled simultane-
ously. Typically, the over-current condition is obtained from
an EAFR-110 relay and the trip relay will be activated in 7
ms. The over-current condition may also be monitored by
non-Eaton products (e.g.: generic feeder protection relay)
and the total operation time is then dependent on device
feeding the over-current signal to the EAFR-101.
The sensor channel S1 can be set to operate on arc light
only, even if other channels operate on both conditions of
arc light and over-current.
Figure 19 shows an example of a system applying both
over-current and arc light for tripping from the sensor chan-
nels S2, S3, and S4 activations and arc light only from sen-
sor channel S1 activation. The S1 channel is monitoring the
transformer feeder bus duct above the current monitoring
point. a maximum three arc light point sensors type EAFR-
01 can be connected to each sensor channel.
The current monitoring signal is in this application coming
from an external over-current relay.
5. System Self-supervision
11
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