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Functions and characteristics
Micrologic control units
Micrologic E “energy”
1
long-time threshold and tripping delay
2
overload alarm (LED) at 1.125 Ir
3
short-time pick-up and tripping delay
4
instantaneous pick-up
5
earth-leakage or earth-fault pick-up and tripping delay
6
earth-leakage or earth-fault test button
7
long-time rating plug screw
8
test connector
9
lamp test, reset and battery test
10
indication of tripping cause
11
digital display
12
three-phase bargraph and ammeter
13
navigation button "quick View" (only with Micrologic E)
14
navigation button to view menu contents
15
navigation button to change menu
Micrologic E control units protect power circuits. They
also offer measurements, display, communication and
current maximeters. Version 6 provides earth-fault
protection.
(1)
Display on FDM121 only.
Note:
Micrologic E control units come with a transparent lead-
seal cover as standard.
"Energy meter" measurements
In addition to the ammeter measurements of Micrologic A
Micrologic E control units measure and display:
current demand
b
voltages: phase to phase, phase to neutral, average
b
(1)
and unbalanced
(1)
instantaneous power: P, Q, S
b
power factor: PF
b
power demand: P demand
b
energy: Ep, Eq
b
(1)
, Es
(1)
.
Accuracy of active energy Ep is 2 % (including the sensors). The range of
measurement is the same as current with Micrologic A, depending of an external
power supply module (24 V DC).
Communication option
In conjunction with the COM communication option, the control unit transmits the
following:
settings
b
all "ammeter" and "energy" measurements
b
enable connection to FDM121
b
tripping causes
b
maximeter / minimeter readings.
b
Protection
Protection thresholds and delays are set using the adjustment dials.
Overload protection
True rms long-time protection.
Thermal memory: thermal image before and after tripping.
Setting accuracy may be enhanced by limiting the setting range using a different long-
time rating plug. Overload protection can be cancelled using a specific LT
rating plug "Off".
Short-circuit protection
Short-time (rms) and instantaneous protection.
Selection of I
2
t type (ON or OFF) for short-time delay.
Earth-fault protection
Source ground return earth fault protection.
Selection of I
2
t type (ON or OFF) for delay.
Neutral protection
On three-pole circuit breakers, neutral protection is not possible.
On four-pole circuit breakers, neutral protection may be set using a three-position
switch: neutral unprotected (4P 3d), neutral protection at 0.5 Ir (4P 3d + N/2), neutral
protection at Ir (4P 4d).
Zone selective interlocking (ZSI)
A ZSI terminal block may be used to interconnect a number of control units to provide
total discrimination for short-time and earth-fault protection, without a delay before
tripping.
Overload alarm
A yellow alarm LED goes on when the current exceeds the long-time trip threshold.
Programmable contacts
The programmable contacts may be used to signal events
(Ir, Isd, Alarm Ir, Alarm Ig, Ig). They can be programmed using the keypad on the
Micrologic E control unit or remotely using the COM option (BCM ULP) and RSU
software.
Fault indications
LEDs indicate the type of fault:
overload (long-time protection Ir)
b
short-circuit (short-time Isd or instantaneous li protection)
b
earth fault (Ig)
b
internal fault (Ap).
b
Trip history
The trip history displays the list of the last 10 trips. For each trip, the following
indications are recorded and displayed:
the tripping cause: Ir, Isd, li, Ig or Auto-protection (Ap) trips
b
the date and time of the trip (requires communication option).
b
Battery power
The fault indication LEDs remain on until the test/reset button is pressed. Under
normal operating conditions, the battery supplying the LEDs has a service life of
approximately 10 years.
Test
Amini test kit or a portable test kit may be connected to the test connector on the front
to check circuit-breaker operation. For Micrologic 6.0 E control units, the operation of
earth-fault or earth-leakage protection can be checked by pressing the test button
located above the test connector.
DB128038
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