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A-43
Micrologic 2.2 / 2.3-M
Ratings (A)
In at 65 °C
(1)
25 50 100 150 220 320 500
Circuit breaker
Compact NSX100
b b b
-
-
-
-
Compact NSX160
b b b b
-
-
-
Compact NSX250
b b b b b
-
-
Compact NSX400
-
-
-
-
-
b
-
Compact NSX630
-
-
-
-
-
b b
L
Overloads (or thermal protection): Long-time protection and trip class
Pick-up (A)
tripping between
1.05 and 1.20 Ir
Ir
value depending on trip unit rating (In) and setting on dial
In = 25 A
Ir = 12 14 16 18 20 22 23 24 25
In = 50 A
Ir = 25 30 32 36 40 42 45 47 50
In = 100 A
Ir = 50 60 70 75 80 85 90 95 100
In = 150 A
Ir = 70 80 90 100 110 120 130 140 150
In = 220 A
Ir = 100 120 140 155 170 185 200 210 220
In = 320 A
Ir = 160 180 200 220 240 260 280 300 320
In = 500 A
Ir = 250 280 320 350 380 400 440 470 500
Trip class as per IEC 60947-4-1
5
10
20
Time delay (s)
tr
1.5 x Ir 120
240 480 for warm motor
depending on selected trip class
6 x Ir
6.5
13.5 26 for cold motor
7.2 x Ir 5
10
20 for cold motor
Thermal memory
20 minutes before and after tripping
Cooling fan
non-ad
j
ustable - motor self-cooled
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Pick-up (A)
accuracy ±15 %
Isd
= Ir x ...
5
6
7
8
9
10 11
12 13
Time delay (ms)
tsd
non-ad
j
ustable
Non-tripping time
20
Maximum break time
60
I
Short-circuits: Non-adjustable instantaneous protection
Pick-up (A)
accuracy ±15 %
Ii non-ad
j
ustable
425 750 1500 2250 3300 4800 6500
Time delay (ms)
Non-tripping time
Maximum break time
0
30
Phase unbalance or phase loss
Pick-up (A)
accuracy ±20 %
Iunbal in % average current
(2)
> 30 %
Time delay (s)
non-ad
j
ustable
0.7 s during starting
4 s during normal operation
(1)
Motor standards require operation at 65°C. Circuit-breaker ratings are derated to take this requirement into account.
(2)
The unbalance measurement takes into account the most unbalanced phase with respect to the average current.
Additional technical characteristics
Phase unbalance
An unbalance in three-phase systems occurs when the three voltages are not equal in amplitude
and/or not displaced 120° with respect to each other. It is generally due to single-phase loads
that are incorrectly distributed throughout the system and unbalance the voltages between the
phases.
These unbalances create negative current components that cause braking torques and
temperature rise in asynchronous machines, thus leading to premature ageing.
Phase loss
Phase loss is a special case of phase unbalance.
b
During normal operation, it produces the effects mentioned above and tripping must occur
after four seconds.
b
During starting, the absence of a phase may cause motor reversing, i.e. it is the load that
determines the direction of rotation. This requires virtually immediate tripping (0.7 seconds).
Starting time in compliance with the class (Micrologic 2-M)
For normal motor starting, Micrologic 2-M checks the conditions below with respect to the
thermal-protection (long-time) pick-up Ir:
b
current > 10 % x Ir (motor-off limit)
b
overrun of 1.5 x Ir threshold, then return below this threshold before the end of a 10 s time
delay.
If either of these conditions is not met, the thermal protection trips the device after a maximum
time equal to that of the selected class.
Pick-up Ir must have been set to the current indicated on the motor rating plate.
Long starts (Micrologic 6 E-M)
When this function is not activated, the starting conditions are those indicated above.
When it is activated, this protection supplements thermal protection (class).
A long start causes tripping and is characterised by:
b
current > 10 % x Ir (motor-off limit) with:
b
either overrun of the long-time pick-up (1 to 8 x Ir) without return below the pick-up before the
end of the long-time time delay (1 to 200 s)
b
or no overrun of the long-time pick-up (1 to 8 x Ir) before the end of the long-time time delay (1
to 200 s).
Pick-up Ir must have been set to the current indicated on the motor rating plate.
This protection should be coordinated with the selected class.
DB112114
Unbalance of phase currents and voltages
DB115573
1 to
2
00 s
Return
Overrun
Ir
1.5 Ir (Microlo
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10 % Ir
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Motor starting and long starts
559E1500.indd
version: 1.0