10
Instruction Booklet
IB0191002EN
Effective November 2019
EAFR-101C arc point sensor relay
user manual
EATON
www.eaton.com
7.1.2 Binary output BO1, and BO2
Two binary outputs are available (+ 24 Vdc) . BO1 is the light signal
output to connected EAFR-110PLV relays . This output activates
when light is received on one of the light sensor inputs . BO2 is the
Block Out signal . This output activates when either of the connected
circuit breakers opens . This sends the blocking signal to all other
connected EAFR-110C relays . For more information on the blocking
signal, see Section 7 .2 .2 Circuit breaker binary inputs BI1,BI2, BI3,
and BI4 .
ote:
N
The binary output is polarity sensitive (see IB0191003EN) .
7.1.3 System failure (SF) relay
The SF relay is a form C type (NO/NC) and is energized in the
healthy condition . Whenever the EAFR-101C detects a system error
or disconnection of the auxiliary power supply, the contact changes
its state . The state of the SF relay remains the same until the EAFR-
101C returns to a healthy condition and SF relay is again energized .
7.2 Inputs
7.2.1 Arc sensor channels S1, S2, S3, and S4
The EAFR-101C has four arc point sensor channels . A maximum of
three arc point sensors (type EAFR-01) may be connected to each
channel .
For details on sensors refer to Section 4: Arc sensors .
7.2.2 Circuit breaker binary inputs BI1, BI2, BI3, and BI4
The EAFR-101C contains six binary inputs . The inputs are activated
by connecting a dc signal exceeding the specified nominal threshold
level of the corresponding input . The nominal threshold level is
24 Vdc . The actual activation of the binary input occurs at 80% of
the specified nominal threshold value (i .e . 16 Vdc) .
BI1 and BI2 are reserved for the breaker open/close status informa-
tion . When an air-insulated circuit breaker interrupts a fault, high
current is present, as is light from the arc chutes on the circuit
breaker, and the EAFR system may operate as if this event were an
arc flash . If the CB has outputs that give indication of an opening
operation before the primary contacts part, these outputs can be
connected to BI1 + BI2 or BI3 + BI4 . If an input is received on
either of these two input pairs, the EAFR-101C restrains sending
any light information out on BO1 for 50 ms . This gives the circuit
breaker long enough time to clear the fault . Also at the time of
input, the EAFR-101C outputs a blocking signal on BO2 to all other
connected EAFR-101C relays . This communicates to the other
relays in the system to also restrain passing light information out
for 50 ms . After 50 ms, if any light is still present, the EAFR-101C
will then give a light out signal on BO1 . This blocking operation only
occurs when a connected circuit breaker opens . A normally open
(Form a) and normally closed (Form b) output is required from each
connected circuit . This is for signal redundancy and error checking .
If the input is the same on BI1 and BI2, or on BI3 and BI4, the self-
supervision relay is released and the ERROR LED is illuminated . The
corresponding LED’s for the circuit breaker input will blink synchro-
nously on the front of the EAFR-101C .
If a circuit breaker will be taken out of service for an extended
period, it is advisable that the input for that circuit breaker be
disabled . This is done via the dipswitches on the rear of the
EAFR-101C . For details on dipswitch settings, refer to Section 3 .5
Dipswitch settings .
7.2.3 Binary inputs BI5 and BI6
BI5 is the Master Trip/Current input . If set to Master Trip, upon
receipt of this input the EAFR-101C will trip without other conditions
being present . If set to Current, this input is permissive to tripping if
any light signal is received on light sensor channels set to Light and
Current (see section 3 .5 Dipswitch settings) .
BI6 is the Block In input . If a signal is received on this input, the
EAFR-101C will restrain any light signal received for 50 ms . This
input should be connected to the Block Out BO2 from all other
connected EAFR-101C relays (refer to IB0191003EN) .
7.3 Auxiliary voltage
The auxiliary power supply voltage is (110-220) Vac/(125-250) Vdc .
After powering up the relay, protection is active and operational
within 50 ms .
An optional 18-72 Vdc power supply is also available .