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A-44
Functions and
characteristics
Motor protection
Micrologic 6 E-M electronic trip units
Protection
……………………………………………
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ad
j
usted via the keypad .
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that is 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. It is possible to scroll through settings and
measurements with the cover closed.
Overloads (or thermal), class and short-circuits
The long-time, short-time and instantaneous functions are identical to those of
Micrologic 2-M.
In addition, there is trip class 30 for long-time protection and a setting for self-cooled
or fan-cooled motors ( ).
Ground-fault protection (Ig)
Residual type ground-fault protection with an ad
j
ustable pick-up
Ig
(with Off position)
and ad
j
ustable time delay
tg
.
Phase unbalance or phase loss (lunbal)
This function opens the circuit breaker if a phase unbalance occurs:
that is greater than the
b
Iunbal
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(30 % by default)
following the
b
tunbal
time delay that is:
0.7 s during starting
v
ad
j
ustable from 1 to 10 seconds (4 seconds by default) during normal operation.
v
Phase loss is an extreme case of phase unbalance and leads to tripping under the
same conditions.
Locked rotor (Ijam)
This function detects locking of the motor shaft caused by the load.
During motor starting
(see page A-43),
the function is disabled.
During normal operation, it causes tripping:
above the
b
Ijam
SLFN XS WKDW FDQ EH ¿QH DGMXVWHG IURP WR [ ,U
in con
j
unction with the
b
tjam
time delay that can be ad
j
usted from 1 to 30 seconds.
Under-load (Iund)
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pump). It detects phase undercurrent.
During motor starting
(see page A-43),
the function is always enabled.
During normal operation, it causes tripping:
below the
b
Iund
SLFN XS WKDW FDQ EH ¿QH DGMXVWHG IURP WR [ ,U
in con
j
unction with the
b
tund
time delay that can be ad
j
usted from 1 to 200
seconds.
Long starts (Ilong)
This protection supplements thermal protection (class).
It is used to better ad
j
ust protection to the starting parameters.
It detects abnormal motor starting, i.e. when the starting current remains too high or
too low with respect to a pick-up value and a time delay.
It causes tripping:
in relation with a
b
llong
SLFN XS WKDW FDQ EH ¿QH DGMXVWHG IURP WR [ ,U
in con
j
unction with the
b
tlong
time delay that can be ad
j
usted from 1 to 200
seconds.
(see "long starts" page A-43)
Display of type of fault
……………………………
On a fault trip, the type of fault (Ir, Isd, Ii, Ig, lunbal, l
j
am), the phase concerned and
the interrupted current are displayed.
Indications
…………………………………………
Front indications
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b
event of a fault.
Red alarm LED for motor operation: goes ON when the thermal image of the rotor
b
or stator is greater than 95% of the permissible temperature rise.
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See description on
page A-42
for SDTAM and
page A-81
for SDx.
Note:
all the trip units have a transparent lead-sealable cover
that protects access to the adjustment dials.
Micrologic 6.E-M is used in
2-device
motor-feeder solutions
.
It provides the same protection as
Micrologic 2-M:
b
short-circuits
b
overloads with selection of the same trip
classes (5, 10 or 20), plus trip class 30 for
starting of machines with high inertia.
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protection functions that can be set via the
keypad.
PB103376
SDTAM remote indication relay module
with its terminal block.
DB112116
559E1500.indd
version: 1.0