E-31
ENGLISH
16. Electronic trip relay (ETR) section
1. ERR. LED, Contact alarm output
When any abnormality or setting failure is
found in ETR, the LED alerts the operators
to the abnormal status. When the power
supply type is P3 or P4, contact output is
given between 513 and 574 on the control
circuit terminal block.
• ETR function abnormality (Microprocessor, H/W)
• Internal wiring abnormality of the circuit breaker re-
lated to ETR
2. RUN LED
This LED indicates that ETR is functional.
When control power is applied or approx. 10%
of rated current, flows into the main circuit,
the LED will light.
3. Trip indicator (LED and contact alarm
output)
The LED indicates the tripping or pre-alarm
status. When the power supply type is P3
or P4, contact output is given between 513
(common) and 524 , 534 , 544 , and 554
on the control circuit terminal block.
When the current exceeds the pre-alarm
current setting (Ip), the PAL LED will blink.
When the half time of LTD passes, the PAL
LED will light and output the contact.
4. Frequency selector switch for an ETR
with DP
To ensure measurement accuracy, set this
switch according to the circuit frequency to
be used (50 Hz or 60 Hz).
5. MCR (Making current release)
Only when the circuit breaker is turned on
(from the off state), it has the INST char-
acteristics. After it is turned on, the INST
characteristics will be disabled. MCR can be
functional by setting the INST setting dial of
ETR to the MCR side.
6. RESET button
The trip indicator (LED and contact alarm
output) can be reset by pressing the “RESET”
button on the front panel of ETR or short-cir-
cuiting RS1 and RS2 on the control circuit
terminal block.
A function is provided to temporarily lock LTD
and STD when the INST characteristics is
tested with the field test device. (Refer to the
instruction manual for the field test device.)
(Note)
To ensure measurement accuracy for an
ETR with DP, set the frequency selector
switch according to the circuit frequency
to be used.
1.15
(xlu)
1
.92
(OVER)
TEST
TRIP
ALARM
(s)
L/S LOCK
.84
.76
.68
1
.9
3
3
1.5
1.5
.15
.15
.1
.1
.8
.8
.5
.5
.3
.3
.7
.5
.3
.1
RESET
Tg
Tg
(xln)
Ig
Ig
Ip
TEST
Freq.
50Hz
60Hz
GF
GF
TYPE S1
RUN
ERR.
PAL
Ip
Iu
Isd
Tsd
I
T
LTD
STD
INST
i
I
2
t
L
OVER
100
Ir
(×In)
Iu
(×Ir)
Isd
(×Ir)
I
i(×Ir)
I
2
t
ON
I
2
t
OFF
T
L(s)
Tsd
(s)
INST
1
16
16
12
12
10
10
8
6
4
2
2
4
6
8
.9
.8
.7
.6
.5
MCR
Iu ×2
80
60
%lu
1
.96
.92
.88
.84
.8
10
8
6
4
3
2.5
2
1.5
150
100
50
25
12
.5
.5
.3
88
.1
.06
.06
.1
.3
RUN LED
ERR. LED
LED indicating
cause of tripping
Frequency
selector switch
for an ETR
with DP
RESET
button
1
2
3
4
6
LED indicating
cause of tripping
3
MCR
5
Option
