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.