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559E1200.indd
version: 1.0
Functions and
characteristics
Protection of distribution systems
Micrologic 5 / 6 A or E trip units
Micrologic 5 / 6 A (Ammeter) or E (Energy)
trip units can be used on Compact NSX100
to 630 circuit breakers with performance
levels B/F/H/N/S/L. They all have a display
unit.
They offer basic LSI protection (Micrologic 5)
or LSI and ground-fault protection G
(Micrologic 6).
They also offer measurement, alarm and
communication functions.
Protection
……………………………………………
Settings can be ad
j
usted in two ways, using the dials and/or the keypad .
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keypad is protected by a locking function displayed on the screen and controlled
by a microswitch . The lock is activated automatically if the keypad is not used for
5 minutes. Access to the microswitch is protected by a transparent lead-sealable
cover. With the cover closed, it is still possible to display the various settings and
measurements using the keypad.
Overloads: Long time protection (Ir)
Inverse time protection against overloads with an ad
j
ustable current pick-up
Ir
set
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tr
is set using the
keypad.
Short-circuits: Short-time protection (Isd)
Short-circuit protection with an ad
j
ustable pick-up
Isd
and ad
j
ustable time delay
tsd
,
with the possibility of including a portion of an inverse time curve (I
2
t On).
Short-circuits: Instantaneous protection (Ii)
Instantaneous protection with ad
j
ustable pick-up
Ii
.
Additional ground fault protection (Ig) on Micrologic 6
Residual type ground-fault protection with an ad
j
ustable pick-up
Ig
(with Off position)
and ad
j
ustable time delay
tg
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curve (I
2
t On).
Neutral protection
On 4-pole circuit breakers, this protection can be set via the keypad:
b
Off: neutral unprotected
v
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1.0: neutral fully protected at Ir
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WLPHV WKH YDOXH RI WKH SKDVH SLFN XS
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[ ,U
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b
neutral sensor with the output (T1, T2) connected to the trip unit.
Zone selective interlocking (ZSI)
A ZSI terminal block may be used to interconnect a number of Micrologic control
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available only in relation to the upstream circuit breaker (ZSI out).
Display of type of fault
..........................................
On a fault trip, the type of fault (Ir, Isd, Ii, Ig), the phase concerned and the interrupted
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Indications
.............................................................
Front indications
b
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event of a fault.
Orange overload pre-alarm LED: steady on when I > 90 % Ir
b
Red overload LED: steady on when I > 105 % Ir
b
Remote indications
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following information:
overload trip
b
overload prealarm (Micrologic 5) or ground fault trip (Micrologic 6).
b
This module receives the signal from the Micrologic electronic trip unit via an optical
link and makes it available on the terminal block. The signal is cleared when the
circuit breaker is closed.
These outputs can be reprogrammed to be assigned to other types of tripping or
alarm. The module is described in detail in the section dealing with accessories.
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Interrupted current
Display of interrupted current.
3%
SDx remote indication relay
module with its terminal block.
Note:
all the trip units have a transparent lead-sealable cover
that protects access to the adjustment dials.
DB112109
A-18