micrologic 20 70a eng

Micrologic control units2.0 A, 5.0 A, 6.0 A and 7.0 ALow Voltage Products

User manual

We do more with electricity.

Micrologic A Schneider Electric1

Discovering your control unit 2Identifying your control unit 2Overview of functions 4

Setting your control unit 10Selecting the type of neutral protection 10Setting procedure 11Setting the Micrologic 2.0 A control unit 12Setting the Micrologic 5.0 A control unit 13Setting the Micrologic 6.0 A control unit 14Setting the Micrologic 7.0 A control unit 15

Fault and status indications 16Resetting the fault indicationsand checking battery status 16Testing the earth-faultand earth-leakage functions 17

Menus 18Accessing the menus 18Measuring phase currents 19Displaying the maximum current values 20Resetting the maximum current values 21Viewing the settings 22

Technical appendix 24Tripping curves 24Changing the long-time rating plug 26Zone selective interlocking (ZSI) 27Digital display 28Thermal memory 29

Micrologic control units2.0 A, 5.0 A, 6.0 A and 7.0 A


Discovering yourcontrol unit

E51

384A

E51

450A

All Compact NS800-3200 and MasterpactNT and NW circuit breakers are equippedwith a Micrologic control unitthat can be changed on site.Control units are designed to protectpower circuits and connected loads.

Identifying your control unitDesignations

E51

352A

X: type of protectionc 2 for basic protectionc 5 for selective protectionc 6 for selective + earth-fault protectionc 7 for selective + earth-leakage protection

Y: version numberidentification of the control-unit generation."0" signifies the first generation.

Z: type of measurementc A for "ammeter"c P for "power meter"c H for "harmonic meter"c no indication: no measurements

Micrologic 2.0 A: basic protection and ammeter

Long time + Instantaneous

Micrologic 5.0 A: selective protection and ammeter

Long time + Short time + Instantaneous

E51

385A

E51

354A

0 Ir Isd I

t

0 Ir I

t

IiIsd

Micrologic 6.0 A: selective + earth-fault protection andammeter

E51

387A

E51

354A

E51

395A

0 Ir I

t

IiIsd

Long time + Short time+ Instantaneous

Earth-fault protection

Micrologic 7.0 A: selective + earth-leakage protection andammeter

E51

388A

E51

354A

E51

452A

0 Ir I

t

IiIsd

Long time + Short time+ Instantaneous

Earth-leakage protection

Micrologic 2.0 A

YX

Z

Micrologic 2.0 A

40

100%

%

menu

long timealarm

instantaneous

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

48

121620

tr(s)

at 6 Ir24

x Ir

22.5

3 45

6

1.5

setting

Isd

810

Micrologic 5.0 A

40

100%

%

menu

delay

short timetsd(s)

long timealarmtr

(s)

setting

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

4 8 121620

at 6 Ir24

x Ir

22.5

3 4 568

10

Isd

1.5on I2t

.2

.4 .4

.1

.3

.10

I i

x In

3

4

8

off2

.3

instantaneous

.26

15

1012

Micrologic 6.0 A

40

100%

%

menu

delay

short time

on I2t

.2

.3.4 .4

.1

.2

.10

long timealarm

ground fault

setting

4

test

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

48

121620

tr(s)

at 6 Ir24

x Ir

22.5

3 4 568

10

Isd

1.5

tsd(s)

x In

3

68 10

1215

off2

BC

D E FGH

I

Ig

Aon I2t

.2

.3.4 .4

.1

.2.3

.10off

tg(s)

.1

.3instantaneous

I i

0 I

t

I2t off

I2t on

Ig

Micrologic 7.0 A

40

100%

%

menu

.98

delay

short time

off

long timealarm

setting

earth leakage

test

.4.5.6

.7.8

.9.95

1

Ir

x In

tr(s)

.512

48

121620

at 6 Ir24

x Ir

22.5

34 5

68

10

Isd

1.5

tsd(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10

x In

34

6 8 1012

15off2

12

35 7

1020

30.5

I∆n

800

∆I

60

140

230 350

instantaneousI i

0 I

t

I∆n


1 top fastener2 bottom fastener3 protective cover4 cover opening point5 lead-seal fixture for protective cover6 long-time rating plug7 screw for long-time rating plug8 connection with circuit breaker9 infrared link with communications interfaces10 terminal block for external connections11 housing for battery12 digital display13 three-phase bargraph and ammeter

Adjustment dials

14 long-time current setting Ir15 long-time tripping delay tr16 short-time pickup Isd17 short-time tripping delay tsd18 instantaneous pick-up Isd19 instantaneous pick-up Ii20 earth-fault pick-up Ig21 earth-fault tripping delay tg22 earth-leakage pick-up I∆n23 earth-leakage tripping delay ∆t

Indications

24 LED indicating long-time tripping25 LED indicating short-time tripping26 LED indicating earth-fault

or earth-leakage tripping27 LED indicating auto-protection tripping28 LED indicating an overload

Navigation

29 navigation button to change menus30 navigation button to view menu contents31 button for fault-trip reset and battery test

Test

32 test button for earth-fault and earth-leakageprotection

33 test connector

Presentation

E51

389A

E51

390A

E51

391A

Micrologic 7.0 A Micrologic 2.0 A

Micrologic 5.0 A

E51

394A

E51

393A

Micrologic 6.0 A

E51

392A

3

2

1

10

5.4

.5

.6.7

.8 .9.95

.98

1.5

12

48 12

16

20

24

long time

alarm

Ir

tr(s)

x Inat 6 Ir

7

1112

Micrologic 7.0 A

40

100%

%

menu

31

13

4

30

29

6

8

9

instantaneous

long timealarm

.4.5.6

.7.8

.9.95.98

1

Ir

x In .512

48

121620

tr(s)

at 6 Ir24

x Ir

22.5

3 4 568

101.5

setting

Isd

14

15

18

33

28

7

Micrologic 7.0 A

40

100%

%

menu

delay

short time

I i

long timealarm

test

800

earth leakage

12

35 7

1020

30

∆I(ms)

60.5

140

230 350I∆n(A)

settingx Ir

22.5

3 4 568

101.5x In

3

46

8 101215

off2

.512

48

121620

tr(s)

at 6 Ir24.4

.5

.6.7

.8.9

.95

.981

Ir

x In

29

15

14

17

16

23

22

30

28

7

19

33

31

12

13

27262524

tsd(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

instantaneousIsd

32

.95

.98

setting delay

short timeI itsd

(s)

long timealarm

.4.5.6

.7.8

.9

1

Ir

x In .512

48

121620

tr(s)

at 6 Ir24

x Ir

22.5

3 4 568

10

Isd

1.5on I2t

.2

.3.4 .4

.1

.2.3

.10

x In

34

6 8 1012

15off2

14

15

16

17

19

28

7

33

instantaneous

.4.5.6

.7.8

.9.95.98

1

delay

short timeI itsd

(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

long timealarmIr

x In

ground fault

BC

DE F

GH

I

Ig tg(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10off

A

.512

48

121620

tr(s)

at 6 Ir24

settingx Ir

22.5

34 5

68

10

Isd

1.5x In

34

68 10

1215

off

test

instantaneous

15

14

17

16

21

20

28

7

19

32

33

2



Protection settingsDepending on the type of installation, it is possible to set the tripping curve of yourcontrol unit using the parameters presented below.

Long-time protectionThe long-time protection function protects cables (phases and neutral)against overloads. This function is based on true rms measurements.

Thermal memoryThe thermal memory continuously accounts for the amount of heat in the cables,both before and after tripping, whatever the value of the current (presence ofan overload or not). The thermal memory optimises the long-time protectionfunction of the circuit breaker by taking into account the temperature rise in thecables. The thermal memory assumes a cable cooling time of approximately15 minutes.

Long-time current setting Ir and standard tripping delay tr

E51

358A

Overview of functionsCurrent protection

Micrologic 2.0 A

1. current setting Ir (long time)2. tripping delay tr (long time) for 6 x Ir3. pick-up Isd (instantaneous)

Micrologic control unit 2.0 A and 5.0 Acurrent setting Ir = In x …(*) 0.4 0.5 0.6 0.7 0.8 0.9 0.95 0.98 1tripping between other ranges or disable by changing rating plug1.05 and 1.20 x Irtime delay (s) tr at 1.5 x Ir 12.5 25 50 100 200 300 400 500 600accuracy: tr at 6 x Ir 0.5 1 2 4 8 12 16 20 240 to -20 % tr at 7.2 x Ir 0.34 0.69 1.38 2.7 5.5 8.3 11 13.8 16.6

* In: circuit breaker rating

Setting accuracy of the Ir setting may be enhanced by using a different long-timerating plug.See the technical appendix "Changing the long-time rating plug".

0 Ir Isd I

t1

2

3E

5135

9A

Micrologic 5.0 A, 6.0 A,7.0 A

1

2

3

4

5

0 Ir Isd I

t

Ii

I2t off

I2t on E

5138

6A

E51

396A


1. current setting Ir(long time)2. tripping delay tr(long time) for 6 x Ir3. pick-up Isd (short time)4. tripping delay tsd(short time)5. pick-up Ii(instantaneous)

1. pick-up Ig (earth fault)2. tripping delay tg(earth fault)

1. pick-up I∆n(earth leakage)2. tripping delay ∆t(earth leakage)

0 I

t

1

2

I2t off

I2t on

Ig 0 I

t

I∆n

1

2


Short-time protectionc the short-time protection function protects the distribution system againstimpedant short-circuitsc the short-time tripping delay can be used to ensure discrimination with adownstream circuit breakerc this function carries out true rms measurements.

c the I2t ON and I2t OFF options enhance discrimination with downstreamprotection devicesc use of I2t curves with short-time protection:v I2t OFF selected: the protection function implements a constant time curve;v I2t ON selected: the protection function implements an I2t inverse-timecurve up to 10 Ir. Above 10 Ir, the time curve is constant.

c zone selective interlocking (ZSI)The short-time and earth-fault protection functions enable time discriminationby delaying the upstream devices to provide the downstream devices the timerequired to clear the fault. Zone selective interlocking can be used to obtain totaldiscrimination between circuit breakers using external wiring.

Short-time pick-up Isd and tripping delay tsd

Micrologic control unit 2.0 A, 5.0 A, 6.0 A and 7.0 Apick-up Isd = Ir x … 1.5 2 2.5 3 4 5 6 8 10accuracy ± 10 %time delay settings I2t OFF 0 0.1 0.2 0.3 0.4(ms) at 10 Ir I2t ON 0.1 0.2 0.3 0.4I2t ON or tsd (max resettable time) 20 80 140 230 350I2t OFF tsd (max break time) 80 140 200 320 500

Instantaneous protectionc the instantaneous-protection function protects the distribution systemagainst solid short-circuits. Contrary to the short-time protection function,the tripping delay for instantaneous protection is not adjustable.The tripping order is sent to the circuit breaker as soon as current exceedsthe set value, with a fixed time delay of 20 milliseconds.c this function carries out true rms measurements.

Instantaneous pick-up Isd

Micrologic control unit 2.0 Apick-up Isd = Ir x … 1.5 2 2.5 3 4 5 6 8 10accuracy ± 10 %

Instantaneous pick-up Ii

Micrologic control unit 5.0 A, 6.0 A and 7.0 Apick-up li = In x … (*) 2 3 4 6 8 10 12 15 OFFaccuracy ± 10 %

* In: circuit-breaker rating

For the characteristics and external wiringof the zone selective interlocking function,see the technical appendix on"Zone selective interlocking".

The portable test kit can be used to testthe wiring between circuit breakersfor the zone selective interlocking function.



Protection of the fourth pole on four-pole circuit breakersProtection of the neutral conductor depends on the distribution system.There are three possibilities.

Type of neutral Description.Neutral unprotected The distribution system does not require protection

of the neutral conductor.Neutral protection The cross-sectional area of the neutral conductorat 0.5 In is half that of the phase conductors.

c the long-time current setting Ir for the neutral is equalto half the setting valuec the short-time pick-up Isd for the neutral is equalto half the setting valuec the instantaneous pick-up Isd (Micrologic 2.0 A)for the neutral is equal to half the setting valuec the instantaneous pick-up Ii (Micrologic 5.0 A / 6.0 A /7.0 A) for the neutral is equal to the setting value.

Neutral protection The cross-sectional area of the neutral conductor is equalat In to that of the phase conductors.

c the long-time current setting Ir for the neutral is equalto the setting valuec the short-time pick-up Isd for the neutral is equal tothe setting valuec the instantaneous pick-ups Isd and Ii for the neutralare equal to the setting value.

Overview of functionsCurrent protection

Earth-fault protection on Micrologic 6.0 Ac an earth fault in the protection conductors can provoke local temperature riseat the site of the fault or in the conductors.The purpose of the earth-fault protection function is to eliminate this type of fault.c there are two types of earth-fault protection.

Type DescriptionResidual c the function determines the zero-phase sequence

current, i.e. the vectorial sum of the phase and neutralcurrentsc it detects faults downstream of the circuit breaker.

Source Ground Return c using a special external sensor, this functiondirectly measures the fault current returningto the transformer via the earth cablec it detects faults both upstream and downstreamof the circuit breakerc the maximum distance between the sensorand the circuit breaker is ten metres.

c earth-fault and neutral protection are independent and can therefore becombined.

Earth-fault pick-up Ig and tripping delay tgThe pick-up and tripping-delay values can be set independently and are identicalfor both the residual and "source ground return" earth-fault protection functions.

Micrologic control unit 6.0 Apick-up Ig = In x … (*) A B C D E F G H Iaccuracy In ≤ 400 A 0.3 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1± 10 % 400 A < In ≤ 1200 A 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

In > 1200 A 500 A 640 A 720 A 800 A 880 A 960 A 1040 A 1120 A 1200 Atime delay settings I2t OFF 0 0.1 0.2 0.3 0.4(ms) at 10 In (*) I2t ON 0.1 0.2 0.3 0.4I2t ON or tg (max resettable time) 20 80 140 230 350I2t OFF tg (max break time) 80 140 200 320 500

* In: circuit-breaker rating


Current protection and alarms

Earth-leakage protection on Micrologic 7.0 Ac the earth-leakage protection function primarily protects people against indirectcontact because an earth-leakage current can provoke an increase in the potentialof the exposed conductive parts. The earth-leakage pick-up value I∆n is displayeddirectly in amperes and the tripping delay follows a constant-time curvec an external rectangular sensor is required for this functionc this function is inoperative if the long-time rating plug is not installedc d protected against nuisance tripping.c k DC-component withstand class A up to 10 A.

Pick-up value I∆n and tripping delay ∆t

Micrologic control unit 7.0 Apick-up I∆n 0.5 1 2 3 5 7 10 20 30accuracy0 to - 20 %time delay settings(ms) ∆t (max resettable time) 60 140 230 350 800

∆t (max break time) 140 200 320 500 1000

Overload LED

E51

398A

This LED signals that the long-time current setting Ir has been overrun.

Fault indications

E51

399A

E51

400A

E51

401A

E51

402A

Signals tripping due to anoverrun of the long-timecurrent setting Ir.

Signals tripping dueto an overrun of theshort-time pick-up Isdor the instantaneouspick-up Isd / Ii.

Signals tripping due to anoverrun of the earth-faultpick-up Ig or the earth-leakage pick-up I∆n.

Signals tripping due tothe auto-protectionfunction of the controlunit.

delay

short timeI itsd

(s)

long timealarm

test

800

earth leakage

12

35 7

1020

30

∆t(ms)

60.5

140

230 350I∆n(A)

settingx Ir

22.5

34 5

68

10

Isd

1.5on I2t

.2

.3.4 .4

.1

.2.3

.10

x In

34

6 8 101215

off2

.512

48

121620

tr(s)

at 6 Ir24.4

.5

.6.7

.8.9

.95

.981

Ir

x In

instantaneous

40

%

%

100



The auto-protection function (excessivetemperature or short-circuit higher thancircuit-breaker capacity) opens the circuitbreaker and turns on the Ap LED.

Caution.If the circuit breaker remains closed andthe Ap LED remains on, contact theSchneider after-sales support department.

Caution.The battery maintains the fault indications.If there are no indications, check thebattery.



Overview of functionsAmmeter measurements

c all Micrologic control units measure the true rms value of currentsc the most heavily loaded phase is continuously displayed on the digital screenc using the navigation buttons, it is possible to display successively the I1, I2, I3,neutral IN, Ig, I∆N and stored-current (maximeter) valuesc the percent load on each phase is displayed. A bargraph displays the currentsmeasured on phases 1, 2 and 3 as a percentage of the long-time current setting Ir.

E60

371A

40

%

%

1001.125 x Ir1 x Ir0.8 x Ir0.6 x Ir0.4 x Ir

If no information is displayed on the screen,see the technical appendix "Digital display".


Setting your control unit Selecting the typeof neutral protection

On four-pole circuit breakers, it is possible to select the type of neutral protectionfor the fourth pole:c neutral unprotected (4P 3D);c neutral protection at 0.5 In (3D + N/2);c neutral protection at In (4P 4D).

E51

383A

4P 3D

3D+N/2

4P 4D


Setting procedure

Setting procedure1. Open the protective cover.

2. Select the desiredsetting.The set value isautomatically displayedon the digital screen inabsolute value with therelevant units.c Current in amperes(A and kA);c Tripping delays inseconds.

E51

410A

E51

411A

3. If no information is displayed, see the technicalappendix "Digital display". If no further action is taken,after a few seconds, the display returns to the mainmenu for current measurements.

4. Close the protective cover and, if necessary, installa lead seal to protect the settings.

E51

412A

Using the portable test kitTo test the control unit, connect the portable test kit via the test connector.

1

Micrologic 7.0 A

40

100%

%

menu

Micrologic 7.0 A

40

100%

%

menu

2

AIr=

3

Micrologic 7.0 A

40

100%

%

menu

E51

413A

2

Micrologic 7.0 A

40

100%

%

menu

E51

410A

1

Micrologic 7.0 A

40

100%

%

menu

See the user manual for the portabletest kit


Setting your control unit Setting the Micrologic 2.0 Acontrol unit

Set the threshold values

E51

366A E

6036

5A

Set the tripping delay

The rating of the circuit breakerin this example is 2000 A.

See pages 4 and 5 for informationon the available settings

E51

368A

E60

366A

E51

370A

1

In = 2000 A

In = 2000 A

In = 2000 A

Ir = 0.7 x In = 1400 A

Isd = 3 x Ir = 4200 A

alarm

x Ir

22.5

3 4 56

8101.5

setting

Isdinstantaneous

.4.5.6

.7.8

.9.95.98

1

long timeIr

x In

0 I

tIr

Isd

long timealarm

.512

48

121620

tr(s)

at 6 Ir24

tr = 1 second

0 I

t

tr


Setting the Micrologic 5.0 Acontrol unit


E51

366A E

6036

7A



See pages 4 and 5 for informationon the available settings

E60

368A

In = 2000 A

Ir = 0.7 x In = 1400 A

Ii = 3 x In = 6000 A

Isd = 2 x Ir = 2800 A.4

.5

.6.7

.8 .9.95.98

1

setting

short timeI i

x Ir

22.5

3 4 568

10

Isd

1.5

long timealarmIr

x In

x In

34

6 8 101215

off2

instantaneous

tr = 1 second

tsd = 0.2 seconds

short time

long timealarm

.512

4 8 1216

20

tr(s)

at 6 Ir24

delay

tsd(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10

I2t on I2t off

E51

372A

E51

373A

Ir

Isd

Ii

0 I

tIr

Isd

Ii

0 I

t

I2t ON curve I2t OFF curve

1

In = 2000 A

In = 2000 A

Thresholds

E51

375A

E51

376A

tr

tsd

0 I

t

tr

tsd

0 I

t


Tripping delays


Setting your control unit Setting the Micrologic 6.0 Acontrol unit


E51

366A E

5141

4A


See pages 4 to 6 for informationon the available settings.

E51

373A

E51

372A

Ir

Isd

Ii

0 I

tIr

Isd

Ii

0 I

t



E60

372A

E51

376A

E51

375A

tr

tsd

0 I

t

tr

tsd

0 I

t

E51

416A

E51

415A

E51

419A

E51

418A

0 I

t

tg

0 I

t

tg

1

In = 2000 A

In = 2000 A

short time

long timealarm

ground fault

setting

.4.5.6

.7.8

.9.95.98

1

Ir

x In

x Ir

22.5

3 4 56

810

Isd

1.5

BC

D E FGH

I

Ig

A

I i

x In

34

6 8 101215

off2

In = 2000 A

Ir = 0.7 x In = 1400 A

Ii = 3 x In = 6000 A

Isd = 2 x Ir = 2800 A

B Ig = 640 A

instantaneous

test

0 I

t

Ig

0 I

t

Ig

short time

long timealarm

ground fault

.512

48

121620

tr(s)

at 6 Ir24

delay

tsd(s)

on I2t

.2

.3.4 .4

.2.3

.10

off

tg(s)

on I2t

.2.3

.4 .4

.1

.2.3

.10off

tr = 1 second

tsd = 0.2 seconds

tg = 0.2 seconds

I2t on I2t off.1

test

Thresholds

Tripping delays



Setting the Micrologic 7.0 Acontrol unit


E51

366A

E51

420A


See pages 4 to 7 for informationon the available settings.


E60

373A

1

In = 2000 A

In = 2000 A

.4.5.6

.7 .8 .9.95.98

1

short timeI i

long timealarmIr

x In

ground fault

setting

x Ir

22.5

3 4 568

10

Isd

1.5x In

3

46 8 10

12

15off2

instantaneous

In = 2000 A

Ir = 0.7 x In = 1400 A

Ii = 3 x In = 6000 A

Isd = 2 x Ir = 2800 A

I∆n = 1 A

1

23 5 7

10

2030.5

I∆n(A)

test

short time

long timealarm

ground fault

.51

24 8 12

1620

tr(s)

at 6 Ir24

delay

tsd(s)

on I2t

.2

.3.4 .4

.1

.2.3

.10

off

800

∆t(ms)

60

140

230 350

tr = 1 second

tsd = 0.2 seconds

∆t = 140 milliseconds

I2t on I2t offtest

I2t OFF curve

E51

373A

E51

372A

Ir

Isd

Ii

0 I

tIr

Isd

Ii

0 I

t


E51

376A

E51

375A

tr

tsd

0 I

t

tr

tsd

0 I

t

E51

421A

E51

423A

Thresholds

Tripping delays

I2t ON curve

0 I

t

I∆n

0 I

t

∆t


Fault and statusindications

The procedure for closing the circuitbreaker following a fault trip is presentedin the circuit-breaker user manual.

Resetting the fault indicationsand checking battery status

If the battery needs to be changed, pleaseuse the one with Schneider cataloguenumber 33593 (characteristics given on thebattery compartment cover).

Resetting the fault indicationsc determine why the circuit breaker tripped.The fault indication is maintained until it is reset on the control unit.v press the fault-trip reset button.

E51

439A

v check the parameter settings of the control unit.

Checking the battery

E51

441A

Press the battery-test button (same as the fault-trip reset button) to displaythe battery status.

If no information is displayed, either:c no battery is installed in the control unit, or;c an auxiliary power supply is required.See the technical appendix "Digital display".

Changing the control-unit battery

1. Remove the batterycover.

2. Remove the battery.

E51

442A

E51

443A

3. Insert a new battery.Check the polarity.

4. Put the cover back inplace. Press the battery-test button to check thenew battery.

E51

444A

Micrologic 7.0 A

E51

440A Micrologic 7.0 A

Battery fully chargedBattery half chargedChange the battery

40

100%

%

+ E51

445A

40

100%

%


Testing the earth-fault and earth-leakage functions

Charge and close the circuit breaker.

Using a screwdriver, press the test button for earth-fault and earth-leakageprotection. The circuit breaker should open.

E51

410A

1

Micrologic 7.0 A

40

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%

menu

E51

456A

Micrologic 7.0 A

40

100%

%

menu

2

If the circuit breaker does not open, contact the Schneider after-salessupport department.


Accessing the menus

Symbols used:

Briefly press a key.

Press and hold a key.

E51

404A

E51

405A

It is possible at any time to stop consultinga current measurement, a maximumcurrent value recorded by the maximeter orthe setting values. After a few seconds, theMicrologic control unit automatically returnsto the main menu displaying the currentvalue of the most heavily loaded phase.

The protection settings can be displayeddirectly on the digital display.

Three menus may be accessed on Micrologic control units, providing the followinginformation:c phase current measurements I1, I2, I3, neutral IN, earth-fault current Ig on theMicrologic 6.0 A control unit and earth-leakage current I∆n on the Micrologic 7.0 Acontrol unit;c maximeter current values for phases I1, I2, I3, neutral IN, the maximum earth-fault current Ig on the Micrologic 6.0 A control unit and the maximum earth-leakagecurrent I∆n on the Micrologic 7.0 A control unit;c protection settings and tripping delays.

Press the "menu" buttonto access the maximumcurrent values measuredby the maximeter.

Press the "menu" buttonto access the protectionsettings and trippingdelays.

Press the "menu" buttonto return to the currentmeasurements.

E51

406A

E51

407A

E51

408A

4. The system returnsto the main"Measurements" menu.

E51

409A

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%

A

menu

40

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%

A

Max

menu

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%

AIr=

menu

40

100%

%

A

Menus

1. Measurements 2. Maximeter 3. Settings


Current values may be read in the"Measurements" menu, which is also themain menu.

If no particular action is taken, the systemdisplays the current value of the mostheavily loaded phase.

E51

409A

Measuring phase currents

Display of current I1. Display of current I2.

E51

425A

E51

426A

Press the "arrow" buttonto go on to current I2.

Press the "arrow" buttonto go on to current I3.

Display of current I3.

Display of current Ig(Micrologic 6.0 A) orcurrent I∆n(Micrologic 7.0 A).

Press the "arrow" buttonto go on to current IN ifthe circuit breaker isconnected to the neutral.

E51

427A

E51

428A

Display of current IN.

The system returns tothe display of current I1.

E51

429A

E51

409A

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%

A40

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%

A

40

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%

A

40

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A

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%

A

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A

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%

A

Press the "arrow" buttonto return to current I1.

"Measurements" menuPhase 1 is the most heavily loaded.

Press the "arrow" buttonto go on to the earth-faultcurrent Ig or the earth-leakage current I∆n.


Menus

Maximum current values may be read inthe "Maximeter" menu.

If no particular action is taken, the systemreturns to the main menu.

E51

407A

Displaying the maximumcurrent values

Display of themaximum I1 current.


E51

430A

E51

431A

Press the "arrow" buttonto go on to the maximumI2 current.

Press the "arrow" buttonto go on to the maximumI3 current.


Press the "arrow" buttonto go on to the maximumearth-fault current Ig(Micrologic 6.0 A) or themaximum earth-leakagecurrent I∆n(Micrologic 7.0 A)

Press the "arrow" buttonto go on to the maximumIN current if the circuitbreaker is connected tothe neutral.

E51

432A

E51

433A

Display of themaximum IN current.

The system returns tothe display of themaximum I1 current.

E51

434A

E51

435A

Press the "arrow" buttonto return to the maximumI1 current.

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100%

%

A

MAX

40

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%

A

MAX

40

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%

A

MAX

40

100%

%

MAX

A

40

100%

%

A

MAX

40

100%

%

A

MAX

40

100%

%

A

Max

menu

Display of the maximumIg current or themaximum I∆n current.

"Maximeter" menu.


Maximum current values can be resetusing the "Maximeter" menu.

If no particular action is taken, the systemreturns to the main menu.

E51

407A

Resetting the maximum currentvalues

Select the maximumcurrent value to bereset (e.g. I2 max.).

Reset.

E51

436A

E51

437A

Press the "arrow" buttonas many times asrequired to select I2 max.

Press and hold the"arrow" button down forthree to four seconds.The current value flashesduring the reset, thenchanges to the presentvalue (the newmaximum).

Select another valueto reset or return tothe main menu.

Press the "arrow" buttonas many times asrequired to select anothermaximum value to resetor return to the mainmenu.

E51

438A

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%

A

Max

menu

40

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%

A

MAX

40

100%

%

A

MAX

40

100%

%

A

MAX

"Maximeter" menu.


Menus Viewing the settingsE

6037

4A

Long-time current setting Ir

Long-time tripping delay tr

Short-time pick-up Isd

Short-time tripping delay tsd

Instantaneous pick-up Isd

Instantaneous pick-up Ii

Earth-fault pick-up Ig

Earth-leakage pick-up I∆n

Earth-fault tripping delay tg

Earth-leakage tripping delay ∆t

Micrologic control unit

Select the "Settings"menu.The Ir value is the firstdisplayed.

Press the "arrow" buttonto go on to the tr value.

Press the "arrow" buttonto go on to theshort-time Isd value.

Press the "arrow" buttonto go on to the tsdvalue.

Press the "arrow" buttonto go on to theinstantaneous Isdvalue.

Or

Press the "arrow" buttonto go on to the Ig value.

Or

Press the "arrow" buttonto go on to the tg value.

Or

the ∆t value.

Press the "arrow" buttonto return to thebeginning of the menu.

the instantaneous Iivalue.

menu

A

str=

AIsd=

stsd=

AIg=

s

tg=

s∆t=

AIr=

Ii=

Ir=

Isd= A

A

I∆n=

A

the I∆n value.

5.0 A 6.0 A 7.0 A2.0 A


Technical appendix Tripping curves

Long-time and instantaneous protection (Micrologic 2.0 A)

E60

369A

.5 .7 1 2 3 4 5 7 10 20 30 50 70 100 200 300

I / Ir

10 0005 000

2 000

1 000

500

200

100

50

20

10

5

2

1

.5

.2

.1.05

.02

.01

.005

.002

.001

t(s)

tr = 0.5…24 s

Isd = 1.5…10 x Ir

Ir = 0.4…1 x In

Long-time, short-time and instantaneous protection(Micrologic 5.0 A, 6.0 A and 7.0 A)

E60

370A

0

0.40.3

0.20.1

t(s)

.5 .7 1 2 3 4 5 7 10 20 3 5 7 10 20 30

10 0005 000

2 000

1 000

500

200

100

50

20

10

5

2

1

.5

.2

.1.05

.02

.01

.005

.002

.001

x In

tr = 0.5…24 s

Isd = 1.5…10 x Ir

Ir = 0.4…1 x In

Ii = 2…15 x In . OFF (1)

I2t OFF

x Ir

0.40.3

0.20. 1

I2t ON

0


Earth-fault protection (Micrologic 6.0 A)

E46

266A

Ig = A…J x In (1) 1200 A max.

t(s)

I / In

10 0005 000

2 000

1 000

500

200

100

50

20

10

5

2

1

.5

.2

.1.05

.02

.01

.005

.002

.001.05.07 .1 .2 .3 .4 .5 .7 1 2 3 5 7 10 200 300

I2t OFF

0.4

0.30.20.1

I2t ON

0.4

0.30.20.1

0 0


Technical appendix

Caution.Following any modifications to the long-time rating plug, all control-unit protectionparameters must be checked.

Changing the long-timerating plug

Select the long-time rating plugA number of setting ranges for the long-time current setting are available onMicrologic A control units by changing the long-time rating plug.

The available rating plugs are listed below.

Part number Setting range for the Ir value33542 standard 0.4 to 1 x Ir33543 low setting 0.4 to 0.8 x Ir33544 high setting 0.8 to 1 x Ir33545 without long-time protection

Change the long-time rating plugProceed in the following manner.

2. Open the protectivecover of the control unit.

3. Completely removethe long-time rating plug screw.

E51

378A

E51

379A

4. Snap out the ratingplug.

5. Clip in the new rating plug.

E51

380A

E51

381A

6. Refit the screw for thelong-time rating plug.

7. Check and/or modify thecontrol-unit settings.

Caution.If no long-time rating plug is installed, thecontrol unit continues to operate under thefollowing downgraded conditions:c the long-time current setting Ir is 0.4;c the long-time tripping delay trcorresponds to the value indicated by theadjustment dial;c the earth-leakage protection function isdisabled.

Micrologic 7.0 A

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menu

Micrologic 7.0 A

40

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%

menu

Micrologic 7.0 A

40

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%

menu

.4.5.6

.7.8 .9

.95

.98

1

long time

alarm

Ir

x In

.512

48 12

16

20

tr(s)

@ 6 Ir24

Micrologic 7.0 A

40

100%

%

menu

.4.5.6

.7.8 .9

.95

.98

1

long time

alarm

Ir

x In

.512

48 12

16

20

tr(s)

@ 6 Ir24

1. Open the circuit breaker.


Caution.If the protection function is not used oncircuit breakers equipped for ZSIprotection, a jumper must be installed toshort terminals Z3, Z4 and Z5.If the jumper is not installed, the short-timeand earth-fault tripping delays are setto zero, whatever the position of theadjustment dial.

Zone selective interlocking (ZSI)

Operating principlec A fault occurs at point A.Downstream device no. 2 clears the fault and sends a signal to upstream deviceno. 1, which maintains the short-time tripping delay tsd or the earth-fault trippingdelay tg to which it is set.c A fault occurs at point B.Upstream device no. 1 detects the fault. In the absence of a signal from adownstream device, the upstream device immediately trips without taking intoaccount its tripping-delay settings. If it is connected to a device even furtherupstream, it sends a signal to that device, which delays tripping according to its tsdor tg setting.

Note :On a circuit breaker likely to receive a ZSI signal, the tsd and tg tripping delays must notbe set to zero, as this would make discrimination impossible.

E51

397A

A

B1

2

Upstreamcircuit breaker

Z1 Z2 Z3 Z4 Z5

Terminal blockfor externalconnections

Downstreamcircuit breaker


and/or

and/or


Z1 Z2 Z3 Z4 Z5

Z1 Z2 Z3 Z4 Z5

E60

375A

Connections between control unitsA logic signal (0 or 5 volts) can be used for zone selective interlocking between theupstream and downstream circuit breakers.c Micrologic 5.0 A, 6.0 A, 7.0 A.c Micrologic 5.0 P, 6.0 P, 7.0 P.c Micrologic 5.0 H, 6.0 H, 7.0 H.

Wiringc maximum impedance: 2.7 Ω / 300 metresc capacity of connectors: 0.4 to 2.5 mm2

c maximum cross-sectional area of wires (including insulation): 3.5 mm2

c wires: single or multicorec maximum length: 3000 metresc limits to device interconnection:v the common ZSI - OUT - SOURCE (Z1) and the output ZSI - OUT (Z2)can be connected to a maximum of 10 inputs;v a maximum of 100 devices may be connected to an input ZSI IN CR (Z4) or GF(Z5)c connections are made from the output ZSI - OUT (Z2) on the downstream deviceto the input(s) ZSI - IN - ST (Z4) and/or GF (Z5) on the upstream device.

Terminals Z1 to Z5 correspond to theidentical indications on the circuit-breakerterminal blocks.


Technical appendix Digital display

c display of measurements operates without an external power supply.The digital display goes off if the current drops below 0.2 x In (In = rated current).c display back-lighting is disabled in the following situations:v current less than 1 x In on one phase;v current less than 0.4 x In on two phases;v current less than 0.2 x In on three phases.c the maximeter does not operate for currents under 0.2 x In.

These three functions may be maintained by adding an external power supply.Even if an external power supply is installed, the long-time, short-time,instantaneous and earth protection functions will not use it.

For information on connecting an externalpower supply, see the electrical diagramsin the circuit-breaker user manual.


Thermal memory

Thermal memoryThe thermal memory is a means to simulate temperature rise and cooling causedby changes in the flow of current in the conductors.

These changes may be caused by:c repetitive motor starting;c loads fluctuating near the protection settings;c repeated circuit-breaker closing on a fault.

Control units without a thermal memory (contrary to bimetal strip thermalprotection) do not react to the above types of overloads because they do not lastlong enough to cause tripping. However, each overload produces a temperaturerise and the cumulative effect can lead to dangerous overheating.

Control units with a thermal memory record the temperature rise caused by eachoverload. Even very short overloads produce a temperature rise that is stored inthe memory.This information stored in the thermal memory reduces the tripping time.

Micrologic control units and thermal memoryAll Micrologic control units are equipped as standard with a thermal memoryc for all protection functions, prior to tripping, the temperature-rise and cooling timeconstants are equal and depend on the tripping delay in question:v if the tripping delay is short, the time constant is low;v if the tripping delay is long, the time constant is high.

c for long-time protection, following tripping, the cooling curve is simulated by thecontrol unit. Closing of the circuit breaker prior to the end of the time constant(approximately 15 minutes) reduces the tripping time indicated in the trippingcurves.

Schneider Electric Industries SA

Designed by: HeadLinesPrinted by:

As standards, specifications and designs develop from time, always ask for confirmation of theinformation given in this publication.

5, rue Nadar92506 Rueil-Malmaison CedexFranceTel: +33 (0)1 41 29 82 00Fax:+33 (0)1 47 51 80 20

http://www.schneiderelectric.com

04443724AA-A 11-99

This document has been printed on ecological paper.

micrologic 20 70a eng

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