SDMO Nexys 2 User manual

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SDMO
Nexys 2
Instructions for use
Réf. constructeur : V 20/09/2004 Réf. GPAO : 33502017201_1_1

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1. Introduction to MICS Nexys .........................................................................................................................................................3
2. Description ....................................................................................................................................................................................3
2.1. Standard configuration.....................................................................................................................................................3
2.1.1 Presentation of the front panel.........................................................................................................................................4
2.1.2 Introduction to pictograms...............................................................................................................................................5
2.1.3 Introduction to the rear panel...........................................................................................................................................6
2.2. Safeguards........................................................................................................................................................................6
3. Use ................................................................................................................................................................................................7
3.1. Manual mode ...................................................................................................................................................................8
3.1.1 Starting the generating set ...............................................................................................................................................8
3.1.2 Stopping the generating set..............................................................................................................................................9
3.2. Automatic mode...............................................................................................................................................................9
3.2.1 Starting the generating set ...............................................................................................................................................9
3.2.2 Stopping the generating set............................................................................................................................................10
3.3. Special features of automatic mode ...............................................................................................................................11
3.4. Emergency stop..............................................................................................................................................................11
4. Alarms and faults ........................................................................................................................................................................12
4.1. Display...........................................................................................................................................................................12
4.2. Appearance of a fault or an alarm..................................................................................................................................12
4.3. List of faults which will cause the generating set to stop and generate a pictogram......................................................13
4.4. List of faults which will cause the generating set to stop and generate a fault code......................................................14
4.5. List of alarms associated with a pictogram....................................................................................................................15
5. Special notes................................................................................................................................................................................15
6. Fault finding ................................................................................................................................................................................17
7. Maintenance ................................................................................................................................................................................17
7.1. Replacing the fuse..........................................................................................................................................................17
8. Programming visualisation..........................................................................................................................................................18
9. Viewing the different screens......................................................................................................................................................19

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1. Introduction to MICS Nexys
MICS Nexys is a command / control module designed to control the generating set.
This module, with a 12V direct current supply, is incorporated into the following control consoles:
N 2500
Circuit breaker rating ≤125 A
N 3500
Circuit breaker rating ≤250 A
N 4500
Circuit breaker rating ≤630 A
Fig. 1.1 – View of control consoles
2. Description
2.1. Standard configuration
The MICS Nexys comprises a polycarbonate control panel housing on which the following components are mounted:
oon the front side:
¾an emergency stop button
¾a key switch for starting up or shutting down the entire module (ON/OFF)
¾a protection fuse
¾three push-buttons
¾an LCD screen
oon the rear side
¾an electronic card with 5 connectors, used for the electrical connection of the generating set to the Nexys module
¾a standard configuration electronic "measurements" card for 40 kVA and higher

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2.1.1 Presentation of the front panel
Fig. 2.1 – View of the front side
cEmergency stop button for switching off the generating set in the event of a fault which could endanger personnel or
damage equipment
dKey switch for starting up/shutting down the module and RESET function
eElectronic card protection fuse
fScreen-scroll button, press successively to access the various screens which are available
gSTOP button, press to switch off the generating set
hSTART button, press to switch on the generating set
iNormal operation LEDs and alarm and fault warning LEDs
jSlot reserved for panel fascia options
kMounting bolt.
lLCD for displaying alarms and faults, operating states, electrical and mechanical quantities
2
1
3
5
9
9
9
6
7
8
4
9
10

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Fig. 2.2 – Description of the LEDs
A lit LED indicates:
cModule being supplied (green, lights up and remains lit)
dEmergency stop activated (control panel or external emergency stop) (red, lights up and remains lit)
eVisualisation of starting phase and speed/voltage stabilisation (flashing) and generating set operating OK or set ready to
generate (green, lights up and remains lit)
fGeneral alarm (orange, flashing)
gGeneral fault (red, flashing).
2.1.2 Introduction to pictograms
The pictograms are as follows:
Operating temperature
Fuel
Overspeed
Non-starting fault
Starting on external command
Preheating
Air intake
Oil pressure
Battery
Delay
Fig. 2.3 – View of pictograms
¾The "fuel level" pictogram is used to display the fault, the alarm and the fuel level.
¾The "operating temperature" and "oil pressure" pictograms are used to display the fault and analog value
¾The "overspeed" and "non-starting fault" pictograms are used to display the fault.
¾The "battery" pictogram is used to display the "alternator charge" fault and to indicate the battery voltage.
1 2 3 4 5
Symbols for electric and
mechanical sizes

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2.1.3 Introduction to the rear panel
Fig. 2.4 – View of the front side
c"Base" electronic card
d"Measurements" electronic card (optional if the power rating of the generating set is less than 30 kVA)
eSlot for options.
2.2. Safeguards
The following options may be added to the standard configuration:
oMeasurements card (if the power rating of the generating set is less than 30 kVA)
oConnected directly to the base card, used for measuring and displaying:
-Electrical quantities (phase-to-neutral voltages "V" and phase-to-phase voltages "U", phase currents
"I")
-Analogue motor quantities (oil pressure, temperature of coolant and level of fuel in daily service tank)
oAuto. pack
9Comprising a preheating switch for the motor cooling circuit, a 12 V – 2.5 A charger connected to the Nexys
module via a wiring harness, a terminal block (2 terminals) and a wiring harness for connecting the external
starting command
oExternal starting command
92-strand wiring harness with customer connection to 2 terminals on the control console
oReport pack (remote information report)
9Provides the following information, on voltage-free switch:
Generating set ready to generate
General fault
Low fuel level fault or alarm (depending on configuration)
oSpeed potentiometer
9Used for adjusting the motor speed by means of a potentiometer located in the panel fascia (this adjustment is
only possible for motors equipped with an electronic regulation system)
oVoltage potentiometer
9Used for adjusting the alternating voltage supplied by the alternator by means of a potentiometer located in the
panel fascia (the potentiometer must be connected to a regulator enabling external adjustment)
3
2
1

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oHorn
9Connected to the "horn" output (2 fast-on connectors located on the electronic card), can be used to sound an
audible warning in the event of a fault of any type. A "horn off" button may be pressed to inhibit operation of the
horn (only the horn).
oAuxiliary emergency stop button
oPower detection
9Used for starting the generating set in automatic mode following:
A loss of power (one or more phases)
A decrease or increase in mains voltage (time and threshold-adjustable)
A direction of rotation check
oDifferential protection
9This may be provided either:
By a "vigi" unit connected directly to the circuit breaker (current delay and threshold)
Or by a time and threshold-adjustable differential relay.
oProtection against insulation faults
oUsed on "IT" systems, unearthed or impedance-earthed neutral, and set up by adding a "PIM" (Permanent
Insulation Monitor)
oAutomatic filling
oUsed to automatically top up the fuel in the daily storage tank. The fuel pump option comprises a control module
connected to the thermal-magnetic circuit breaker for protecting the engine.
o600 Volts
oThis option is used mainly for the Canadian market (600 Volts). A three-phase transformer is positioned
between the alternator and the Nexys database measurement input. When performing the 600 Volt configuration,
a weighting coefficient is applied to the voltage measurement.
3. Use
The command / control module supports two possible modes:
¾manual mode
¾automatic mode.

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3.1. Manual mode
3.1.1 Starting the generating set
Danger
Check that the generating set circuit breaker has triggered.
nconnect the generating set battery.
oturn the key switch to the ON position (without forcing it)
9All of the LEDs light up for 2 seconds, to confirm that they are operating correctly.
9If the LEDs do not light up, check the protection fuse and replace it if necessary.
9All the items on the screen are displayed for 2 seconds.
9Only the "ON" LED remains lit to indicate that the module is powered up.
9The following screen appears.
The first line displays the motor speed in RPM.
The second line displays the battery voltage in
volts (V).
9Check the battery voltage (min. 12 V)
pPress (once briefly) the green "START" button.
9If the motor is equipped with an air preheating system, there is a 10-second delay before the motor starts
(preheating activation period).
9The following screen appears
The third line displays the air preheating time
remaining (with pictograms representing a
resistor and an hourglass).
9If the motor is not fitted with an air preheating system or once the preheating delay has elapsed, the engine starts
up (start of a cycle comprising 3 attempts to start up the engine).
9The following screen appears.
Warning
The number of successive and automatic starting attempts is limited to 3.

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Note: the LED flashes as soon as the START button is pressed and continues to flash until the frequency
stabilises if a "measurements" card has not been inserted and until the frequency and voltage stabilise if a "measurements"
card has been inserted.
Following stabilisation, the LED light comes on continuously.
3.1.2 Stopping the generating set
ntrigger the circuit breaker located at the base of the centre console
oLet the motor run under no load for 1 to 2 minutes to allow it to cool.
ppress the "STOP" button to stop the generating set.
qswitch off the MICS Nexys module by switching the key to "OFF" (without forcing it).
3.2. Automatic mode
3.2.1 Starting the generating set
Danger
When the command / control module is operational (key switch turned to ON), the generating set may
start without warning, upon issue of an external starting command (if the module is equipped with this
option).
When the external command is activated, the "AUT" pictogram appears.
Sequence Screen display
n5-second delay (if this programming has been
performed) to take micro breaks on the line into
account.
The third line on the screen displays the time
remaining for the line micro break.
At the end of this delay, two scenarios are possible:
Generating set with air preheating option
Sequence Screen display LED status
oAir preheating for 10 seconds
pStarting
Flashing:
qGenerating set runs at a stable speed
Continuously lit:
In this case, charging is possible.

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Generating set without air preheating option
Sequence Screen display LED status
oStarting
Flashing:
pGenerating set runs at a stable speed
Permanently lit:
In this case, charging is possible.
Note:
The MICS Nexys does not control opening and closing commands for the N/E reversing switch.
In this case, and if the N/E switch is a third-party component, it must have its own control mechanism for the N/E switching
components.
3.2.2 Stopping the generating set
When the power is restored (controlled by the SDMO switch), there is a time delay. After this (120 seconds), the external
command disappears, the "emergency" switch is triggered and the "normal" switch is deactivated.
When the external command disappears, the "AUT" pictogram continues to flash followed by the cooling delay.
The LED remains lit.
The following screen appears.
When this is complete (120 seconds), the generating set switches off and the "AUT" pictogram goes out.
(1) The emergency switch is controlled by the reversing switch control.
(2) The motor cooling delay is integrated into the Nexys module.

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3.3. Special features of automatic mode
Pressing the "STOP" button when the external command is active ("AUT" pictogram flashing) will stop the generating set
immediately in general fault mode,
(the general fault LED will light up flashing and the following message will appear:
means S.O.S.
000
010 represents a fault code
Refer to the list of fault codes in
Section 4.4.
3.4. Emergency stop
Pressing the emergency stop button switches off the generating set immediately.
The LED lights up red and remains lit, the LED flashes and the following screen appears:
This screen displays the SOS message and the emergency stop
fault code (also see section 4.4).
To restart, it is necessary to:
nresolve the fault which has required the emergency stop button to be pressed
orelease the emergency stop button by turning it clockwise
packnowledge (reset) the fault by moving the key switch to OFF, waiting for the "ON" LED to go out completely and then
moving the key switch to ON.
Note:
Once you have set the key switch to "OFF", if you do not wait for the "ON" LED to go out completely, the fault will not be
acknowledged on restarting.

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4. Alarms and faults
4.1. Display
Faults and alarms are displayed as follows:
cFaults
The LED (general fault) will flash whenever a fault occurs.
In conjunction with this LED:
¾The red LED lights up and remains lit (only for the emergency stop fault).
¾If a pictogram appears on the LCD screen this represents the fault along with the SOS message.
OR
¾An SOS message appears flashing with a fault code.
dAlarms
Whenever an alarm occurs, the yellow LED (general alarm) lights up flashing.
In conjunction with this LED:
¾A pictogram appears flashing on the LCD screen to indicate the alarm along with the SOS message.
4.2. Appearance of a fault or an alarm
The appearance of a a fault or an alarm causes the
following screen to be displayed (one or more pictograms
or a fault code along with the SOS message are displayed).
This screen always appears before the screen referred to in
Section 3.1.1
The user can access the following screens by pressing the key
The fault or alarm screen will disappear once the fault or alarm has been removed.
Only one fault is displayed on this screen (the fault which caused the generating set to stop).
If one or more faults have appeared after the first fault, they can only be displayed after the first fault has been reset
(press "Reset" as many times as the number of faults present).
Note: an alarm can appear at the same time as a fault.

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4.3. List of faults which will cause the generating set to stop and generate a pictogram
Oil pressure fault: Indicates that the oil pressure is
incorrect
Associated pictogram
Engine temperature fault: Indicates that the engine
temperature is too high.
Associated pictogram
Non-starting fault: Indicates that there have been three
consecutive unsuccessful starting attempts.
Associated pictogram
Overspeed fault: Indicates an excessive generating set
running speed.
Associated pictogram
Low fuel level fault: Indicates the need to top up the fuel.
Associated pictogram

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4.4. List of faults which will cause the generating set to stop and generate a fault code
Low coolant level fault: indicates that the level of coolant
is low in the radiator (linked to a two second time delay).
Associated message
Additional fault linked to message opposite: is displayed in
the following three cases:
¾Differential fault (1)
¾overload or short-circuit fault (2)
¾insulation fault (3)
(1) Differential fault (optional): with a differential fault
causing the activation of the differential relay, the
generating set stops immediately also causing the
main circuit breaker to be tripped.
(2) Overload or short-circuit fault (optional): with the
circuit breaker SD contact closing (overload or
short-circuit), the generating set switches off
immediately also causing the main circuit breaker to
be triggered.
(3) Insulation fault (optional): with an insulation fault
causing the activation of the control unit performing
insulation, the generating set stops immediately.
Associated message
Underspeed fault: indicates an incorrect rotation speed
(below 1000 rpm).
Associated message
Emergency stop or external emergency stop fault
(see Section 3.4).
Associated message
"STOP" fault activated if the "STOP" button is pressed
whilst the "AUT" LED is flashing to indicate that the
generating set is operating in automatic mode.
Associated message

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4.5. List of alarms associated with a pictogram
Low fuel level alarm: Indicates the need to fill up with
fuel.
Associated pictogram
"Alternator charging fault" alarm indicates a problem
affecting the alternator charging rate.
Associated pictogram
5. Special notes
yEmergency stop
If the shunt on terminal block B11 is removed (control console interior), the generating set stops immediately due to an emergency
stop fault. This terminal block is used for connecting the external emergency stop device (cover or set site).
yProtection fuse
If the fuse blows during operation, the generating set will stop without indicating a fault. It is then necessary to switch the key
switch to OFF, locate the cause of the fault, replace the fuse then switch the switch back to ON.
yMANU and AUTO modes
If the set is started in manu mode (START button) and an external command is received, this takes priority over manu mode. The
generating set will only stop if the external command disappears. Pressing STOP, causes the generating set to stop immediately, a
general fault appears (LED) and the SOS 010 fault code appears.
000.
yAUTO mode with programmed delays
When an external command is received, the "AUT" pictogram flashes during the line micro break and restoration phases as well as
during the starting and speed/frequency stabilisation phases.
yAUTO mode with non-programmed delays
When an external command is received, the "AUT" pictogram flashes during the starting and speed/frequency stabilisation phases.
Once the external command is no longer being received, the "AUT" LED pictogram stops flashing.
yStarting and stopping the generating set
¾If the engine has not reached 1000 rpm when the set is started and 5 seconds after the starter power has been cut, the
generating set stops due to a non-starting fault.
¾In the event of an alternator charging fault, the corresponding pictogram appears (this fault is interpreted as a warning).
¾If the STOP button is pressed or the external order associated with the power return is no longer present, the generating
set stops normally. It will only be possible to restart the set after the engine has been stopped completely at a frequency <
7.5 Hz and a delay of 3 seconds has elapsed.

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yLow fuel level
The low fuel level pictogram flashes if the low fuel level has been configured as an alarm.
The low fuel level pictogram lights up and remains lit if the low fuel level has been configured as a fault. In this case, the general
fault LED flashes red.
yScreen display when pictograms appear
If there is no screen display when the pictograms below appear, this displays that the transmitter is disconnected.
Example:
No display opposite the "coolant temperature" pictogram means that the
transmitter is disconnected.
yCoolant temperature
If the coolant temperature falls below 30°C or rises above 120°C, the display will flash at a value of 30°C or 120°C respectively.
yLCD screen
The LCD screen lights up:
¾Permanently whilst the generating set is starting up or operating
¾For 5 minutes:
oFollowing the appearance of an event when the generating set is in stop mode (an event may be a fault, an alarm
or one of the 3 control buttons being pressed)
oFollowing a normal stop of the generating set by means of pressing the "STOP" button or if the external
command disappears

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6. Fault finding
Probable causes Remedial action
Fuel level too low Fill up with fuel
Faulty module supply fuse Check and replace the fuse
ON/OFF switch in "OFF" position Turn the switch to "ON"
Emergency stop button pressed Release the emergency stop button and reset
the fault, moving the switch to "OFF".
Faulty battery Check and replace the battery if necessary
The motor will not start
No cable connection between the Nexys
module and the charge alternator
Check the connection between the Nexys
module (pin 7 on the 12-pin connector) and
the D+ terminal on the charge alternator.
If the cable connection is OK, check the
module function by connecting pin 7 to earth.
If the motor starts, there is a problem with the
charge alternator.
Faulty module supply fuse Check and replace the fuse
No LED displays and no
screen display Faulty battery Check and replace the battery if necessary
Incorrect wiring to the external command Correct the wiring
“AUT” LED lights up
and remains lit and
”General fault” LED
flashes
Alternating current connected to the external
command input
Identify and correct the fault
7. Maintenance
Danger
Before starting any operation:
-Switch off the generating set
-check that the generating set circuit breaker is open
-disconnect the battery
-turn the key switch to the OFF position
-Check that no power is being supplied to the centre console (for example: mains powered battery
charger).
7.1. Replacing the fuse
nUse a suitable screwdriver or your hand to turn the cap in an anti-clockwise direction until it can be removed.
oRemove and replace the fuse (use a fuse of the same size and rating).
pRefit the cap in the reverse order to removal.

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8. Programming visualisation
The MICS Nexys is factory-set for your application. The user can display this programming as follows:
¾As soon as the Nexys module is switched on (key switch to "ON"), press until the LED test is complete
(until the LEDs go out).
The programming will now appear on the screen. Each parameter appears for 4 seconds, screen by screen.
The parameters appear on the screen in the following order:
Parameter label Possible parameter value(s)
Operating frequency 50, 60 Hz
Nominal speed 1500, 1800, 3000, 3600 RPM
Preheating plug 1 = active, 0 = not active
Micro break and line restoration delay AUT = 1 (active)
AUT = 0 (not active)
Alternator charging fault Active = 1
Not active = 0
Low fuel level Alarm = 0
Fault = 1
Ventilation delay for gas engines Active = 1
Not active = 0
If the "measurements" card has been inserted into the module, the following parameters will appear on the screen:
Parameter label Possible parameter value(s)
Type of line 3P+N, 3P, 2P+N, 1P+N
Nominal voltage (in volts) 208, 220, 230, 240, 380, 400, 415, 440, 480, 500, 600
Current transformers primary current value (in A) 30, 40, 60, 100, 150, 200, 250, 300, 400, 500, 600,
800, 1000, 1200, 1600
No display if
Fuel level
Display if
No display if
Coolant temperature
Display if
1

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Parameter label Possible parameter value(s)
No display if
Motor oil pressure
Display if
9. Viewing the different screens
When the generating set is running, various screens can be accessed.
The number of screens which can be accessed depends on whether or not the "measurements" card has been inserted.
When it is switched on, the following screen is
displayed
Screen 1
Press the screen scroll button to navigate from one screen to another.
Fig. 9.1 – Example of possible navigation between screens

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•1st press
oThe first line displays the number of operating
hours.
oThe second line displays the number of operating
minutes.
Screen 2
•2nd press
othe first line displays the frequency of the AC
current supplied by the generating set (Hz).
oThe second line displays the battery voltage (V).
Screen 3
•3rd press
oIf a "measurements" card has not been inserted, the
display reverts to screen 1.
oIf a "measurements" card has been inserted into the
module, the screen opposite appears:
-the first line displays the fuel level in the daily
service tank as a percentage of the tank capacity
-the second line displays the temperature of the
coolant (°C).
-the third line displays the oil pressure (Bar).
Screen 4
•4th press
oIf a "measurements" card has not been inserted, the
display reverts to screen 1.
oIf a "measurements" card has been inserted into the
module, the screen opposite appears:
-the first line displays the fuel level in the daily
service tank as a percentage of the tank capacity
-the second line displays the temperature of the
coolant (°C).
-the third line displays the oil pressure (PSI).
Screen 5