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Functions of electronic trip relay (ETR) parts
< Functions >
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 type is P3 to P5, contact output is given be-
513
574
tween
and
on the control circuit terminal block.
•ETR function (Microprocessor, H/W)
•Mis-setting of INST. /MCR dial (P.27)
•Internal wiring of breaker related to ETR
2 RUN LED (ETR)
This LED indicates that ETR is functional. When control
power is applied or approx. 10% of current flows into the
main circuit, the internal circuit will start, and the LED will
light.
3 RUN LED (Optional setting module)
This LED indicates that the optional setting module is func-
tional.
When the control power is applied or approx. 10% of the
main circuit current flows, the LED will light.
4 Trip indicator (LED and contact alarm output)
The LED indicates the tripping or pre-alarm status. When
the power supply type is P3 to P5, contact output is given
513
between
(common) and
the control circuit terminal block.
When the current exceeds pre-alarm current setting (Ip),
the PAL LED will blink. When the LTD time (1/2 of TL) is
passed, the PAL LED will light and output the contact.
2RUN LED
(ETR)
1ERR. LED
4LED indicating
cause of tripping
5TAL LED
3RUN LED
(GFR)
4LED indicating
cause of tripping
As for the display and interface unit, see the separate instruction manual.
E − 20
524
534
544
554
,
,
and
on
Fig. 20-1
5 TAL LED and contact output
The ETR temperature detector is made functional by fit-
ting a TAL sensor.
When the power type is P3 to P5, output is given between
513
564
and
on the control circuit terminal block. When
the temperature drops, the output will be reset. To retain
the output, take measures with an external sequence.
6 MCR (Making current release)
Only when the breaker is turned on (from the off state), it
has the INST function. After it is turned on, the INST func-
tion will be disabled. If you specify the use of MCR when
placing an order, the MCR switch will be incorporated in
the main body. MCR will be functional by setting the INST
setting dial of ETR to the MCR side. (Refer to Fig. 20-2)
7 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-circuiting
cuit terminal block.
(P1 and P2 types are not provided with the function to
reset the indication from the control circuit terminal block.)
A function is provided to temporarily lock LTD and STD
when the INST function is tested with the field test device.
(See the breaker tester instruction manual.)
Do not
set
7RESET
button
Option
Option
RS1
RS2
and
on the control cir-
6MCR
Fig. 20-2
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