Himoinsa CEM7, CEM7.2 Instruction Manual
INSTRUCTION MANUAL
PROFESSIONAL
DIGITAL CONTROL UNIT CEM7
CONTENTS
3 1. Introduction
6 2. Front of the display module
10 3. Operating modes
12 4. Operation
22 5. CEM7 control unit inputs and outputs
31 6. CEM7 control unit alarms
47 7. Maintenance
51 8. Options (expansions)
56 9. Appendix I: parameters table
66 10. Appendix II. CEM7 control unit screens
79 11. Appendix III: dimensions, wiring and mechanical parts
92 12. Appendix IV: CAN communications
95 13. Appendix V: calibration of the control unit
97 14. Appendix VI: expanding inputs
97 15. Appendix VII: communications failure
GENERATOR HS355 | PAGE 2
1. INTRODUCTION
The CEM7 control unit is a generator set power supervision and control device.
The control unit consists of 2 different modules:
• Display module. The display module is responsible for carrying out
the information tasks regarding the status of the device and allows
actions to be performed by the user; through the display module
the user is able to control the control unit, as well as program and
congure the functions. Through the display module, access is given
to a record of the last 10 errors registered by the control unit.
• Measurements module. The measurements module is responsible
for performing the tasks of monitoring and control of the control unit.
This module is located in the rear panel to reduce wiring and increase
the control unit's immunity against electromagnetic noise. All the
signal, sensor and actuators are connected to the measurements
module. (See illustrations in Appendix III)
NOTE
A Timer module can be added as an option to the measurements module and
allows the functions of start up, blocking and scheduled maintenance to be
performed. Also, the Timer module allows the capacity of the error records to be
increased.
INTRODUCTION | PAGE 3
1.1 MEASUREMENTS MODULE
The measurements module provides the following electrical signal characteristics,
both those generated and those from the network itself:
• Phase-neutral voltage
• Phase-to-phase voltage
• Current phase
• Frequency
• Active, apparent and reactive power
• Power factor and cosine of FI
• Instant energy (kWh) and accumulated power (day, month, year) with
the timer option
• THD (total harmonic distortion) of voltages and currents
• Calculation of harmonics up to order 20
The measurements module provides the following engine characteristics:
1. Engine alarm inputs:
• Fuel reserve
• Oil pressure
• Water temperature
• Water level
• Emergency stop (mushroom head stop button)
2. Analogue inputs of the engine:
• Fuel level
• Pressure
• Temperature
• Congurable input (Oil temperature)
• Charge-battery alternator voltage
3. Congurable inputs; the measurements plate has 5 inputs that can be
programmed to perform the following functions:
• Tariff change warning
• Tariff change (CEM7 + CEA7CC2)
• Start up disabling
• External start
• Test (CEM7 + CEA7CC2)
• Forced operation
• Programmable alarms
• Genset contactor conrmation
• Parameter set selection
4. Engine statistics:
• Operating hours
• Number of starts
5. The measurements module commands the following engine functions:
• Preheating
• Stopping
• Starting
• Heating resistor
• Fuel transfer pump
• Battery charging alternator excitation
The measurements module has outputs which allow the status of the control unit
to be monitored:
• Motor started
• Control unit alarm
• 3 programmable outputs that monitor the status of the control unit
alarms or the engine status inputs
The measurements module commands relay outputs for activation of the genset
contactor and the electronic protection that trips the genset's general circuit
breaker.
The connection of the measurements module and display module is performed
via a CAN communications bus, enabling the interconnection between additional
modules which ensures the scalability of the control unit.
The following additional modules can be added as options via the CAN bus:
INTRODUCTION | PAGE 4
• Timer device
• Telesignal device
• CCJ1939 device
• Repetitive display
• Telecontrol device
• Announcement panel device
• CAN/USB
• CAN/232 + MODEM LINE
• CAN/232 + MODEM GSM
• CAN/232 + MODEM GSM/GPS POSITIONING
• CAN/232 + MODEM GPRS HG FLEET MANAGER
• CAN/232 + MODEM GPRS/GPS HG FLEET MANAGER
• CAN/485 (MODBus)
• CAN/LAN
• CAN/LAN (MODBUS IP)
• CAN/LAN HG FLEET MANAGER
• Second Zero Suppressor
• PT100 temperature probes expansion
• ATS panel with CEC7 control unit.
• Precision gauge
INTRODUCTION | PAGE 5
2. FRONT OF THE DISPLAY MODULE
The display module has a backlit display and various LEDs for monitoring the
status of the control unit. It also has keys that allow the user to control and
program the control unit.
CEM7 display module
CEM7P display module
FRONT OF THE DISPLAY MODULE | PAGE 6
Fig.1
Fig.2
1. Backlit display 4 lines by 20 digits.
2.1.2 CONTROL UNIT COMMAND BUTTONS
NOTE
The display goes into low power mode (backlight off) after 10 minutes have
passed without any keystroke.
2. Control unit buttons
• Buttons for control unit operating mode
• Control unit command buttons
• Display buttons
• Genset contactor activation button (only CEM7P module)
3. Status LEDs
• ENGINE status LEDs
• ALARMS LEDs
• CONTACTORS status LEDs
2.1 CONTROL UNIT BUTTONS
2.1.1 BUTTONS FOR CONTROL UNIT OPERATING MODES
Lit LED: Automatic
Automatic mode: The control unit
mode active
monitors the status of the genset and
manages its operation and the
programmable inputs.
LED flashing:
Automatic mode
blocked
Manual mode: The control unit is
commanded by the user.
LED off: Manual
mode active
Engine start button (only in manual mode)
Controls the start up with a single push.
Lit LED: Engine started.
Engine stop button (only in manual mode)
The rst press stops the engine following a cooling cycle. The
second press stops the engine immediately.
Lit LED: Engine stopping (with or without cooling)
Alarms reset button. Allows acoustic signals to be eliminated
and the user to report the alarms.
LED flashing: Pending notication alarms.
Lit LED: Alarms active.
Fuel transfer pump button.
In manual mode, this button activates the fuel transfer pump
if the fuel level is below the programmed limit.
Lit LED: Fuel transfer pump active.
2.1.3 DISPLAY BUTTONS
Confirm (V). Enter the menus and conrm the data
entered.
Cancel (X). Leave the menus and cancel the data entered.
Up (+). Advance through the selection on display screens,
the selection in maintenance menus and increase the
programming settings.
Down (-). Go back through the selection on display screens,
the selection in maintenance menus and decrease the
programming settings.
FRONT OF THE DISPLAY MODULE | PAGE 7
2.1.4 CONTACTOR BUTTONS (ONLY CEM7P MODULE)
2.2.2 ALARMS LEDS
Genset contactor. Enable/disable genset contactor (manual
mode only).
2.2 STATUS LEDS
2.2.1 ENGINE STATUS LEDS
Motor started
Preheating
Start engine
Alternator status
battery charging
Lit: Engine running detected
Off: Motor stopped
Lit: Engine preheating activated
Off: Engine preheating deactivated
Lit: Engine started
Off: Engine start deactivated
Lit: With engine running, voltage in the
battery charging alternator is detected
Off: Stopped engine or engine running
without voltage in the battery charging
alternator
Fuel reserve
Battery level
High temperature
Lit: Analogue sensor alarm
Engine start up failure
Overspeeding
Flashing: Digital sensor alarm
Off: Without alarm
Low oil pressure
Auxiliary 1 (freely
programmable)
Auxiliary 2 (freely
programmable)
NOTE
For more details see the Alarms section
2.2.3 CONTACTORS STATUS LEDS (CEM7 + CEA7CC2).
These LEDs only appear active when the switching control unit is connected.
Start up option due to Network Voltage Failure (CEM7 + CEA7CC2)
The M and G symbols on the front of the control unit only appear activated when
the switching control unit is connected.
Network contactor status
Genset contactor status
Lit: Contactor active
Flashing: Contactor in the
connection/disconnection
phase.
Off: Contactor disconnected.
FRONT OF THE DISPLAY MODULE | PAGE 8
2.3 PASSWORDS
The CEM7 control unit has 2 levels of 4-digit password to protect against
unauthorized access. The different levels of access are as follows:
• User (default password: 1111). User level access allows the operator
to access the main menu of the CEM7 control unit.
• Maintenance (default password: 1911). Maintenance level access
allows the operator to access the Parameters programming option
from the main menu.
The CEM7 control unit's passwords are customizable by the user from the main
menu. A user can congure both passwords for their access level and lower-level
passwords.
NOTE
To enter a password see Appendix II: password entry
FRONT OF THE DISPLAY MODULE | PAGE 9
3. OPERATING MODES
3.1 MANUAL MODE
In manual mode, the control unit is commanded by the user via the front panel of
the display module. The user can start and stop the engine by pressing the
START and STOP keys respectively.
Pressing the START key initiates the engine starting procedure (without
deactivating the network contactor CEM7 + CEA7CC2). Pressing the STOP key
initiates the engine stopping procedure with cooling; a second press of the STOP
key causes the engine to stop immediately without waiting for the cooling time.
x 1 click
WITH cooling
NOTE
In manual mode, the control unit's protection devices remain active, being able
to produce alarms that cause the motor to stop.
In manual mode, the control unit does not take into consideration the start
conditions (programmed, by external signal) that can be programmed.
Activation of the genset contactor on the CEM7P display module is performed by
pressing the GENSET key.
x 2 (double click)
WITHOUT cooling
OPERATING MODES | PAGE 10
In order to achieve activation of the genset contactor, the engine has to be
running and provide a stabilised electrical signal.
3.2 AUTOMATIC MODE
In automatic mode supervision of the installation is managed by the control
unit. Under certain conditions which can be programmed, the control unit starts
the genset to power the installation.
Programmable conditions for genset starting and activation of the genset
contactor include:
• External start (Settings table, parameter 10)
• Start programmed by schedule
• Forced operation signal (Settings table, parameter 12 and
Regulations table, parameter 25)
• Starting via the switching panel (CEA7CC2)
3.3 MODE LOCKING FUNCTION
Pressing the Auto or Man keys for 5 seconds activates the locking of the mode.
This control unit state is indicated by the ashing of the mode key currently
active. To deactivate the mode lock and allow normal operation of the control
unit, press the key associated to the active mode for 5 seconds.
5 ’’ Locked 5 ’’ Unlocked
Programmable conditions for genset starting without activation of the genset
contactor include:
• Tariff warning (Settings table, parameter 7)
• Engine test (Settings table, parameter 11)
Also in automatic mode it is possible to manage start ups by using external
devices (PC, modem, display modules or switching control units).
OPERATING MODES | PAGE 11
4. OPERATION
4.1 STARTING THE ENGINE
Under the conditions for activating the control unit, proceed to perform the
following engine start procedure:
4.1.1 DIESEL ENGINE
1. Start delay. Once activation conditions are detected, it is possible to program
a time delay (Times table, parameter 3) before continuing the engine start up
procedure only in automatic (CEM7 + CEA7CC2 or CEM7 + AE)
2. Preheating of the motor (PR). The control unit activates preheating output
(PR) for the programmed time (Times table, parameter 4). The control unit allows
programming of a temperature threshold (Thresholds table, parameter 48) of the
coolant sensor that interrupts the preheating process, before proceeding with
the engine start up.
3. Enabling the starting of the motor (positive contact activation). Enabling the
starting of the motor (positive contact activation) is performed via the
measurements module PC output. The output supports a Stop by De-energisation
conguration (output activation during engine operation) or Stop by Excitation
(engine stop pulse -Table times, - parameter 12). The operating mode of the
enabled output can be set (Times table, parameter 18).
OPERATION | PAGE 12
4. Starting the motor (ARR). For a maximum time (Times table, parameter 5),
the start output of the measurements module is activated while waiting to detect
at least one of the programmed start conditions. The possible engine starting
conditions are:
• Generator voltage (Regulations table, parameter 19). The motor is
considered started when a certain generator voltage is exceeded
(Threshold table, parameter 20).
• Alternator voltage (Regulations table, parameter 20). The motor is
considered started when a certain battery charging alternator voltage
is exceeded (Threshold table, parameter 21).
• Pickup frequency (Regulations table, parameter 21). The motor is
considered started when a certain pickup frequency is exceeded
(Threshold table, parameter 22). To activate the pickup calculation
via the engine ring gear, it is necessary to enter the number of teeth
on the engine's ywheel ring gear (Threshold table, parameter 24);
if the number of teeth for the ywheel ring gear is zero, the pickup
frequency is calculated via the generator frequency according to the
ratio 50 Hz / 1500 rpm, 50 Hz / 3000 rpm or 60 Hz /1800 rpm
(Regulations table, parameter 26).
• Low Oil Pressure Signal (Regulations table, parameter 22). Due to
its characteristics, it is not advisable to use the low oil pressure
signal to detect if the engine is running, but its use is recommended
as protection against a restart, as the engine is already running.
Exceptions to this engine start detection are SCANIA engines and
sensors that have their own power source.
4.1.2 GAS ENGINE
1. Checking the engine gas train (PR). The process of checking the gas train
begins with the activation of the PR output and lasts for a programmable
maximum time (Times table, parameter 4). If the control unit has a programmable
input (Settings table, parameter 25) assigned to the verication of the gas train,
the process checking the gas train shall end when activation of the gas train
verication input is detected; if gas train activation time ends without having
detected gas train verication, the control unit shall attempt the start again. If
the control unit has no input assigned to gas train verication (Settings table,
parameter 25, value 0), the control unit shall carry out the engine start after the
time set for checking the gas train. The gas train output PR will remain active
from the engine's start and running process until the engine stop is carried out.
2. Starting the motor (ARR). For a maximum time (Times table, parameter 5),
the start output of the measurements module is activated while waiting to detect
at least one of the programmed start conditions (Regulations table, parameters
19 to 22).
3. Gas Ignition (PC). Some time after (Times table, parameter 30) activating the
start signal, the PC output is activated to enable engine ignition once the residual
gas has been purged.
4. Gas valve. Some time after (Times table, parameter 31) activating the Gas
Ignition signal, the output congured as gas valve is activated (Settings table,
parameters 1 to 3, value 25).
5. If during the set time no motor starting is detected, the control unit waits for a
period of time (Times table, parameter 2) before retrying the start. Once a certain
number of starts has been exceeded without detecting any start condition (Times
table, parameter 1), the control unit activates the Starting Failure alarm.
6. During motor starting, the excitation of the battery charging alternator is
carried out through the D+ output for a period of time (Times table, parameter 8).
Once the excitation of the alternator has been completed, the measurement
module monitors the correct functioning of the battery charging alternator. In the
event a battery charging alternator failure is detected, the Alternator Failure
alarm is activated (Alarms table, parameter 10).
OPERATION | PAGE 13
7. Generator stabilisation. Once any start condition is detected, the control unit
waits for a xed time for stabilization of the generator signal before monitoring
the quality of the generator signal.
8. Nominal condition. After achieving engine stabilisation, verication of the
generator signal is performed. In this state, the quality of the signal produced by
the genset is evaluated (voltage levels, frequency,...).
PRACTICAL EXAMPLE OF A START OPERATION
NOTE
Before starting the start cycle it is advisable to ensure the genset's main circuit
breaker is in the off position (OFF).
OPERATION
By pressing the START button the start cycle is initiated and is indicated by the
START button's LED switching on. At the same time if the motor has a preheating
plug the PR output is activated, with the corresponding LED switching on ( ),
for the programmed time. (1)
Fig.1
Once this time has elapsed the PR output is deactivated, and the corresponding
LED turns off ( ) and immediately the positive contact of the PC output is
activated and 0.5 seconds later the ARR output with the switching on of the LED
( ), this output remains activated until any engine running condition is
detected. (2)
OPERATION | PAGE 14
Fig.2
Fig.4
Once it has been detected that the engine is running the LED switches on ( ),
this indicates the end of the start cycle and the START button turns off. (3)
Fig.3
The LED corresponding to the battery charging alternator voltage ( ) switches
on when the voltage provided by the alternator exceeds the voltage threshold set
by default. (4)
If during the start cycle, the engine started condition is not detected after 5
seconds, the ARR output deactivates and the corresponding LED turns off
( ). Subsequently the control unit automatically attempts a new start, repeating
a new cycle without the need to press START (4 cycles by default). After
exhausting the attempts to start the engine without success, the control unit
display shows the alarm (START FAILURE). (5)
To interrupt the start cycle just press the STOP button.
x4
Fig.5
OPERATION | PAGE 15
NOTE
The display shows the engine status screen, where the engine status is displayed
during the start up operation. This sequence is:
Genset: Stopped
Genset: Starting
Genset: Started
Genset: Stabilised
Genset: Charging
NOTE
The start an automatic system using a timer, external signal, etc. is carried out
following the same process as when starting manually.
• Pickup frequency (Regulations table, parameter 21). The engine is
considered stopped when the pickup frequency is below the start
up threshold (Threshold table, parameter 22). To activate the pickup
calculation via the engine ring gear, it is necessary to enter the
number of teeth on the engine's ywheel ring gear (Threshold table,
parameter 24); if the number of teeth for the ywheel ring gear is
zero, the pickup frequency is calculated via the generator frequency
according to the ratio 50 Hz / 1500 rpm, 50 Hz / 3000 rpm or 60 Hz
/1800 rpm (Regulations table, parameter 26).
• Low Oil Pressure Signal (Regulations table, parameter 22). The
low oil pressure condition is used for detecting a stop, by which the
engine is considered stopped when it is detected that the sensor is
closed. Exceptions to this engine stop detection are SCANIA engines
and sensors that have their own power source.
4.2 ENGINE STOP
The engine stopping process in automatic mode is carried out as follows:
4.2.1 DIESEL ENGINE
1. Cooling the motor. Once free of charging, the engine will continue running for
a cooling time (Times table, parameter 11). In certain situations, it is possible to
set the alarms (Alarms table, parameters 3, 6, 9...) of the control unit to perform
a stop without engine cooling
2. Engine stop. After the engine cooling time has elapsed, the PC output of the
measurements module is enabled or disabled according to the programmed
conguration (Regulations table, parameter 18). As an engine stop condition it is
possible to select:
• Generator voltage (Regulations table, parameter 19). The engine is
considered stopped when the generator voltage is below the start up
threshold (Threshold table, parameter 20).
• Alternator voltage (Regulations table, parameter 20). The engine is
considered stopped when the battery charging alternator voltage is
below the start up threshold (Threshold table, parameter 21).
4.2.2 GAS ENGINE
1. Checking the engine gas train (PR) and gas valve. The control unit
deactivates the gas supply outputs to the engine.
2. Gas Ignition (PC). Some time after (Times table, parameter 32) closing the
gas supply, the Gas Ignition output is deactivated to stop the engine. If the
engine stop is triggered by an emergency stop alarm, the Gas Ignition output is
deactivated simultaneously to cutting the gas supply.
To conrm the engine has stopped, all the programmed stop conditions must be
detected for a set period of time (Alarms table, parameter 71). If after 90
seconds an engine running condition continues to be detected, the Stop Failure
alarm is triggered.
OPERATION | PAGE 16
PRACTICAL EXAMPLE OF A STOP OPERATION
NOTE
Before starting the stop cycle it is advisable to ensure the genset's main circuit
breaker is in the off position (OFF).
The genset stop can be performed in various ways:
1. Manual: Pressing the STOP button once. To perform a stop with cooling cycle.
2. Manual: Pressing the STOP button twice. To perform a stop without cooling
cycle.
3. Turning the panel's activation key to the “O” position. To perform a stop
without cooling cycle.
4. Automatic: After cancelling the order which leads to the automatic start and
in this way performing a stop with cooling.
Sequence: We press the STOP button once and begin the stop cycle with engine
cooling. This is indicated with the STOP1 button lighting up.
Fig.2
If after a period of time any engine running condition is detected, the control unit
shows on the display the STOP FAILURE alarm and the LED of the STOP button
remains lit (3).
Fig.1
After concluding the cooling time (120 seconds by default), the PC output is
disabled or enabled according to the type of engine to carry out the stop, the
STOP button and the LED ( ) for the started engine switch off (2).
Fig.3
The LED corresponding to the battery charging alternator voltage ( ) switches
off when the voltage provided by the alternator falls below the programmed
voltage threshold (4).
OPERATION | PAGE 17
NOTE
The display shows the engine status screen, where the engine status is displayed
during the stop operation. This sequence is:
Genset: Stabilised
Genset: Cooling
Genset: Stopping
Genset: Stopped.
4.3 FUEL TRANSFER PUMP
It is possible to activate the fuel transfer pump of the CEM7 control unit by
associating its operation with the BT relay of the measurements module
(Regulations table, parameter 4). Once the fuel transfer pump option is enabled,
the operating mode is then set (Regulations table, parameter 1):
1. Inhibited mode. The fuel transfer pump is not managed.
2. Manual mode. The fuel transfer pump is activated by pressing the DIESEL
TRANSF key provided that the fuel level is below the maximum deactivation
threshold (Threshold table, parameter 19)
3. Automatic mode. Managing the fuel transfer pump works by monitoring the
minimum activation threshold (Threshold table, parameter 18) below which the
BT relay is connected and a maximum deactivation threshold (Threshold table,
parameter 19) above which the BT relay disconnects.
4. Combined mode. The combined mode of the fuel transfer pump manages the
fuel transfer pump according to the Automatic mode, but also allows activation of
the BT relay by pressing the diesel Transf. key. Manual activation of the BT relay
is limited by the maximum deactivation threshold (Threshold table, parameter
19). The combined mode of the fuel transfer pump is available for control units
with rmware versions 2.56 and above.
5. Control unit mode. Managing the fuel transfer pump is performed as follows:
• When the control unit is in automatic mode or test mode, the
operation of the fuel transfer pump is managed in automatic mode.
• When the control unit is in manual mode, the operation of the fuel
transfer pump is managed manually.
• When the control unit is in locked mode, the operation of the fuel
transfer pump is inhibited (CEM7 + CEA7CC2).
The control unit mode of the fuel transfer pump is available for control units with
rmware versions 2.54 and below.
OPERATION | PAGE 18
Calibration of the gauge: For correct fuel level measurements (required for
managing the fuel transfer pump and fuel level alarm) a calibration of the tank
gauge should be performed. This requires access to the minimum and maximum
gauge level parameters (Measurements table, parameters 12 and 13). To adjust
the minimum level of fuel in the tank validation of parameter 12 of the
Measurements table should be performed with the gauge in the minimum
position. To adjust the maximum level of fuel in the tank validation of parameter
13 of the Measurements table should be performed with the gauge in the
maximum position.
In the event the gauge response is not linear, it is possible to program a gauge
response curve with up to 8 points from the option MenuParametersSensors.
4.5 BATTERY CHARGING ALTERNATOR
The battery charging alternator is connected to the CEM7 control unit via the
digital output D + and the DI analogue input of the measurements module.
The CEM7 control unit can be congured to produce an Alternator Voltage alarm
(Alarms table, parameters 10 to 12) if a low voltage supplied by the battery
charging alternator is detected through the DI analogue input of the
measurements module.
It is possible to select (Regulations table, parameter 3) between 2 modes of
operation of the battery charging alternator:
4.5.1 ALTERNATOR MODE
4.4 HEATING
Management of engine heating allows 2 modes of activation:
• Assigning the heating function to BT relay of the measurements
module (Regulations table, parameter 4).
• Assigning the heating function to one of the 3 programmable outputs
of the measurements module (Settings table, parameters 1-3)
provided that the BT relay of the measurements module is assigned
to the management of the fuel transfer pump (Regulations table,
parameter 4).
Management of engine heating provides the following function:
• Below a certain engine temperature threshold (Threshold table,
parameter 29), the heating resistor is activated.
• Below a certain engine temperature threshold (Threshold table,
parameter 28), activation of the genset contactor is controlled
and the Low Engine Temperature Alarm is managed (Alarms table,
parameters 73 to 74) .
• Above a certain engine temperature threshold (Threshold table,
parameter 30), the heating resistor is deactivated.
Operation of the CEM7 control unit's battery charging alternator congured to
alternator mode, excites the alternator via a pulse with a congurable duration
(Times table, parameter 8) during engine start process through the D+ output of
the measurements module. At the end of the pulse, the control unit tests the
voltage generated by the battery charging alternator.
The voltage generated by the battery charging alternator can be used as an
engine running condition (Regulations table, parameter 20). For this purpose, the
control unit waits to measure voltage, via the DI analogue input, which is above
an alternator voltage detection threshold (Threshold table, parameter 21).
The CEM7 control unit can be congured to produce an Alternator Voltage alarm
(Alarms table, parameters 10 to 12) if a low voltage supplied by the battery
charging alternator is detected through the DI analogue input of the
measurements module if it is set to alternator mode.
OPERATION | PAGE 19
4.5.2 DYNAMO MODE
PROGRAMMING
Operation of the CEM7 control unit's battery charging alternator congured in
dynamo mode, excites the alternator via a continuous pulse through the D+
output of the measurements module while the engine is in start up phase or is
running.
The control unit congured in dynamo mode cannot use the voltage measured via
the DI analogue input for detecting an engine running condition.
The CEM7 control unit can be congured to produce an Alternator Voltage alarm
(Alarms table, parameters 10 to 12) if a low voltage supplied by the battery
charging alternator is detected through the DI analogue input of the
measurements module if it is set to alternator mode.
4.6 START/STOP KEY
The start/stop key in the ON position causes power to be supplied to the CEM7
control unit's electronic devices (measurements module and display module).
The start/stop key in the OFF position causes a controlled stop if it is running;
once the engine has stopped, power to the CEM7 control unit is disconnected.
4.7 START DUE TO LOAD DEMAND (ONLY CEA7CC2 EXPANSION)
The generator set will start operating, acquiring this load, when network power
consumption is detected which more than the limit set by parameter (Threshold
table, parameter 34). The genset will continue to operate until the genset power
consumption measured falls below a limit set by parameter (Thresholds table,
parameter 35). Both with the start and stop of the genset due to load demand,
the conditions must be validated for a programmable time (Times table,
parameter 27). The function of start up due to load demand is only enabled in
Automatic mode of the CEM7 control unit associated to a switching control unit
CEA7CC2.
NOTE
From the rmware versions of control units: Display 3.20 / Measurements 2.50
4.8 ELECTRONIC PROTECTION
DESCRIPTION
The electronic protection is a feature that permits a control unit output to be
activated in the event of an overload and short circuit alarm. This function allows
the genset's main circuit breaker to be disabled via the trip coil. While any of
these alarms that causes the engine to stop (immediate or cooling) remains
active or pending notication, the output assigned to electronic protection
remains active.
DESCRIPTION
This function enables automatic start up and activation of generator set charging
depending on the power consumption of the network.
The start up is performed according to the programming, considering the
maximum power (Threshold table, parameter 34) the network can consume for a
period of time (Times table, parameter 27). Once the generator set is started,
the system changes genset power leaving the network free of load.
When the load in the installation is below the programmed threshold (Threshold
table, parameter 35) for deactivation and the programmed period of time (Times
table, parameter 27) has elapsed, the system returns to charging the installation
via the network and the genset begins its stopping cycle.
PROGRAMMING
The possible outputs that can be assigned to this function are:
• The SC relay is assigned by default to this function. Furthermore, the
SC relay is also activated when any alarm is generated which causes
the engine to stop.
• The BT relay of the measurements module (Regulations table,
parameter 4).
• Any of the programmable outputs of the measurements module
(Settings table, parameters 1 to 3).
OPERATION | PAGE 20
4.9 MOTORPUMP MODE
4.10 GENSET IN RESERVE
DESCRIPTION
The motorpump mode congures the CEM 7 control unit to display only engine
measurements, hiding generator set voltage measurements. This conguration
must only be used for control units installed in motorpump type systems where
there is no electrical power generation. They must also disable all alarms
associated with the electrical measurements of the control unit and the detection
of the engine start up via generator voltage.
PROGRAMMING:
Enabling the motorpump mode is carried out through programming of a control
unit parameter (Screen table, parameter 6).
DESCRIPTION
The genset in reserve function allows the operation of several generator sets in
the same installation. In order to balance out the hours that all the gensets are
operational, this function lets the control units specify which generator set should
start up. They select the genset whose engine has been running for the least
length of time. This running mode only affects the control unit’s automatic
working mode. For safety reasons, a generator set can not start-up if any other
genset is detected to be starting-up with the functionality of the genset in reserve
enabled.
It is possible to combine the functionality of the genset in reserve with the
programmed weekly schedules (a timer switch expansion is required) in order to
establish priorities during specic periods of time. To do this, you have to
programme time slots in one of the gensets (the master genset) in the facility,
for:
• Forced start-up. During this period, the master genset will have
priority start-up and the facility’s genset in reserve will stop running,
once the master genset has started running.
• Star t-up inhibited. During this period, the master genset will not have
priority and therefore, the genset in reserve will start up. Once the
genset in reserve has started running, the master genset will stop.
PROGRAMMING
Enabling the genset in reserve function is performed by programming a control
unit parameter (Regulations table, parameter 31, values 4 to 7).
OPERATION | PAGE 21
5. CEM7 CONTROL UNIT INPUTS AND
IN: Input
OUT: Outputs
OUTPUTS
The CEM7 control unit's digital inputs, both those with a specic purpose as well
as those which are programmable, have a debounce time associated (Times table,
parameters 15-24) which requires that the value of the input is stable over a time
interval. Also, all of the CEM7 control unit's inputs can be congured to be active
with contact closed to earth or be inactive with contact closed to earth (Regulations
table parameters 5 to 15).
The status of the CEM7 control unit's inputs and outputs can be monitored from
the Main menu1.Inputs/Outputs. From that position, a screen displays the
status of the control unit's digital inputs and outputs:
* INPUTS/OUTPUTS *
IN:
OUT:
Index of the input/output. Ordered from 13 to 1
Detection of an active input is indicated by the following characters:
• IN 1. R: Fuel reserve (RC)
• IN 2. B: Low oil pressure (BPA)
• IN 3. A: High temperature (ATA)
• IN 4. N: Water level (NA)
• IN 5. X: Programmable input 4 (default value, external start)
(AE)
• IN 6. I: Programmable input 5 (default value, disabling start
up) (IA)
• IN 7. P: Emergency stop (PEM)
• IN 8. 1: Programmable input 1
• IN 9. 2: Programmable input 2
• IN 10. 3: Programmable input 3
• IN 11. S: Mushroom head emergency stop
• IN 12. M: Ignition key (MAN)
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 22
Detection of an active output is indicated by the following characters:
• OUT 1. A: Alarm active (AL)
• OUT 2. M: Motor started (MA)
• OUT 3. 1: Programmable output 1 (SAL 1)
• OUT 4. +: Battery charging alternator (D+)
• OUT 5. 2: Programmable output 2 (SAL 2)
• OUT 6. 3: Programmable output 3 (SAL 3)
• OUT 7. r: Network contactor (CRC, CRNA, CRNC)
• OUT 8. g: Genset contactor (CGC, CGNA, CGNC)
• OUT 9. B: Fuel transfer pump/heating resistor
(BTNA, BTA)
• OUT 10. 4: Electronic protection
• OUT 11. R: Preheating/Powered stop (PR)
• OUT 12. P: Unpowered stop/Powered stop (PC)
• OUT 13. C: Enabling control unit
By pressing the up or down scroll keys it is possible to display the analogue
inputs.
5.1 DIGITAL INPUTS
The CEM7 control unit's measurements module has 5 digital inputs with
operation that is already preset.
The xed purpose inputs have the following behaviour:
HIGH TEMPERATURE (ATA)
Digital signal indicating to the control unit that an alarm has been generated due
to high engine temperature (Table Alarms, parameters 1-3).
LOW OIL PRESSURE (BPA)
Digital signal indicating to the control unit that an alarm has been generated due
to low oil pressure (Table Alarms, parameters 4 to 6).
WATER LEVEL (NA)
Digital signal indicating to the control unit that an alarm has been generated due
to low water level (Table Alarms, parameters 16 to 18).
ANALOGUE INPUTS
The value of the resistance analogue inputs is shown in ohms and the voltage
analogue inputs in volts. The various inputs displayed are:
• NC: Fuel level
• PA: Oil pressure
• TM: Engine temperature
• AA: Auxiliary analogue
• DI: Alternator voltage
• VB: Battery voltage
EMERGENCY STOP (PEM + SETA)
Digital signal indicating to the control unit that an immediate stop of the engine
must be performed without cooling
FUEL RESERVE (RC)
Digital signal indicating to the control unit that an alarm has been generated due
to the fuel reserve (Table Alarms, parameters 19 to 21).
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 23
5.2 PROGRAMMABLE INPUTS
The CEM7 control unit's measurements module has 5 digital inputs with
operation that can be programmed. The programmable inputs can be congured
to have the following behaviour:
TARIFF WARNING SIGNAL (EJP1)
This function is only managed in automatic mode of the control unit CEM7 +
CEA7CC2. The input congured as tariff warning (Settings table, parameter 7)
starts the genset after activating the corresponding input and after a set time
(Times table, parameter 9). Completion of the tariff ends when the input EJP1 is
disabled, stopping the engine with cooling.
TARIFF CHANGE SIGNAL (EJP2)
This function is only managed in automatic mode of the control unit CEM7 +
CEA7CC2. The input congured as tariff change (Settings table, parameter 8)
activates the genset contactor provided that no fault is found in the genset.
DISABLING START UP SIGNAL (IA + ENT5)
This function is only managed in automatic mode of the CEM7 control unit. The
input congured as disabling start up (Settings table, parameter 9) prevents the
genset from starting under any starting condition except in the case of forced start
up operation (Settings table, parameter 12) congured as high priority (Regulations
table, parameter 25).
EXTERNAL START SIGNAL (AE + ENT4)
This function is only managed in automatic mode of the CEM7 control unit. The
input congured as external start (Settings table, parameter 10) forces the start
up of the genset if it is in automatic mode, provided none of the following
conditions are present disabling start up:
• the control unit does not manage the disabling start up input (IA) or it
is not active.
• the control unit is not in lock mode programmed by time.
TEST SIGNAL (TEST)
This function is only managed in automatic mode of the CEM7 control unit with
the motorised circuit breaker option.
The input congured as test (Settings table, parameter 11) allows a check of the
genset to be performed without activation of the load.
FORCED OPERATION (MFOR)
This function is only managed in automatic mode of the CEM7 control unit.
The input congured as forced operation (Settings table, parameter 12) complies
with anti-re regulations according to which it should not stop the operation of
the genset under any condition except overspeeding and emergency stop
(whether this is alarm, external start up disabling input or programmed block). It
is possible to congure 3 modes of forced operation (Regulations table,
parameter 25):
• 0: Forced operation not enabled. The process of forced operation is
not managed despite having an associated programmable input.
• 1: Star ting due to network failure. Before activating the forced
operation input, the system waits for the start to occur due to a
programmed condition (alarms related to network signal, network
contactor failure, external start up...) needed to start the genset. To
stop the genset it is not sufcient that the start condition disappears,
but the input associated with the forced operation must be disabled.
• 2: Star ting due to forced operation. Before activating the forced
operation input, the genset starts immediately without the need to
wait for any other start condition to occur. To stop the genset, it is
necessary to switch to manual operating mode and in this mode
perform the stop using the control unit keyboard. Predominating the
stop button.
A delay in starting the genset can be congured through an external input via a
parameter (Regulations table, parameter 31).
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 24
PROGRAMMABLE ALARMS (AL1, AL2 AND AL3)
VERIFICATION OF GAS RAMP (S1 AND S2)
There are 3 programmable alarms available (Settings table, parameters 13, 14
and 15) that can be associated with any of the programmable inputs and which
serve the purpose of providing the control unit with additional alarms with
congurable operation (Alarms table, parameters 79 to 87). These alarms can be
programmed both with regards the mode of action as well as the text shown on
the display when activated.
PROGRAMMABLE ALARMS (AL4 AND AL5)
There are 2 additional programmable alarms available (Settings table, parameters
22 and 23) that can be associated with any of the programmable inputs and
which serve the purpose of providing the control unit with additional alarms with
congurable operation (Alarms table, parameters 111 to 116). These alarms can
be programmed both with regards the mode of action as well as the text shown
on the display when activated.
NOTE
From the rmware versions of control units: Display 3.20 / Measurements 2.50
SELECTION OF SET OF PARAMETERS (S1 AND S2)
There are 2 sets of additional parameters that can be enabled via any of the
programmable inputs (Settings table, parameters 16 and 17). Activating the
parameter set selection input enables the values with which the control unit
operates (Selector table).
GENSET CONTACTOR CONFIRMATION (CKG) (PHG7 REV 4.14 AND HIGHER)
The input congured as genset contactor conrmation (Settings table,
parameter 6) is used to verify the correct activation of the contactor. Upon
activation of the genset contactor, a time interval begins (Times table,
parameter 13) for verication of the contactor through the activation of the
genset contactor conrmation input. If after this time has elapsed there is no
conrmation of the activation of the genset contactor, a genset contactor alarm
is generated (Alarms table, parameter 101). If the control unit is operating in
automatic mode, a stop occurs with engine cooling. Similarly, if the genset
contactor conrmation input is detected as being active when the contactor is
not active, the start up of the generator set is inhibited.
The input congured to perform the gas train verication function (Settings table,
parameter 25) is used in gas engines (Regulations table, parameter 18, value 4)
to complete the testing process of the gas ramp and start the engine start up
process.
5.3 ANALOGUE INPUTS
The CEM7 control unit has 5 analogue inputs for measuring the engine operation
values. These analogue inputs characterize the operation of the engine to display
its status and produce alarms if necessary. By default, the alarms produced by
the analogue inputs do not stop the control unit (engine warnings), but can be
congured to perform this stop with or without cooling.
The CEM7 control unit performs a continuous check on the presence of the
analogue sensors installed, with the readings taken appearing on the display
module screen.
FUEL LEVEL INPUT (NC)
The fuel level analogue input indicates the amount of fuel remaining in the tank.
To adapt its operation it is necessary to adjust the maximum fuel tank value
(Measurements table, parameter 13) and the minimum fuel tank value
(Measurements table, parameter 12). To adjust go to section 4.3.
Also, it is possible to set a minimum fuel threshold in the tank (Thresholds table,
parameter 25) to cause an alarm warning (Alarms table, parameters 55-57) when
the fuel level is detected to be below this limit.
When the BT relay of the measurements module is programmed for managing the
fuel transfer pump, if the fuel level is detected to be below a lower limit
(Thresholds table, parameter 18) the fuel transfer pump is activated to provide
the tank with fuel. The deactivation of the fuel transfer pump occurs when fuel
level is detected to be above the programmable threshold (Thresholds table,
parameter 19). When the fuel transfer pump is in manual operation mode, this
upper threshold leads to the activation of the fuel transfer pump after the user
presses the relative button.
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 25
OIL PRESSURE INPUT (P)
AUXILIARY ANALOGUE INPUT (AA)
The oil pressure analogue input allows the engine oil pressure value to be
monitored. The control unit allows connection of VDO type sensors to the
analogue input. By setting a threshold a minimum oil pressure limit can be
established (Thresholds table, parameter 26) causing an alarm warning (Alarms
table, parameters 52 to 54) when the fuel level is detected to be below this limit.
ENGINE INPUT TEMPERATURE (T)
The engine temperature analogue input allows the engine water temperature
value to be monitored. The control unit allows connection of VDO type sensors to
the analogue input. By setting a threshold a maximum engine temperature limit
can be established (Thresholds table, parameter 27) causing an alarm warning
(Alarms table, parameters 49 to 51) when the temperature is detected to be
below this limit.
Also, provided heating management is programmed (either through the BT relay
or through any programmable output, provided that the BT relay is assigned to
the management of the fuel transfer pump), the engine temperature analogue
input is used to regulate the activation of the heating resistor.
The control unit allows a temperature threshold to be programmed (Thresholds
table, parameter 48) for the coolant sensor that interrupts the preheating
process during the start up of the engine.
ALTERNATOR VOLTAGE INPUT (DI)
The alternator voltage analogue input allows the voltage generated by the battery
charging alternator to be monitored. This input is used to diagnose possible
malfunctioning of the alternator if it detects a low voltage while the engine is
running; under these conditions, a battery alternator alarm (Alarms table,
parameters 10 to 12) is generated.
Also, this voltage can be programmed for detecting genset start up conditions
(Regulations table, parameter 20) via an alternator voltage threshold for the engine
when running (Thresholds table, parameter 21), provided it is not set in dynamo mode
(Regulations table, parameter 3).
The auxiliary analogue input is assigned by default to the supervision of the oil
temperature and can be programmed to be allocated to any other measurement
through a programmable curve (Analogue Sensors table).
ANALOGUE INPUTS EXPANSION
The CEM7 control unit allows you to add 8 analogue temperature inputs to the
PT100 sensor through the expansion of up to 2 CCPT100 devices. 2 maximum
temperature alarms can be added to each of these 4 analogue temperature
inputs with a P100 sensor.
The CEM7 control unit allows you to add 4 congurable analogue inputs (voltage
0 to 10 V, current 4 to 20 mA or resistive) through the expansion of the CCPT100
device. A congurable response curve, a descriptive text and the units displayed
in the user interface of the control unit can be associated to each of these 4
congurable analogue inputs.
5.4 PICKUP INPUT (PKC1, PKC2)
The measurements module pickup input measures the engine speed in
revolutions per minute (rpm). To calculate the speed it is necessary to enter the
number of teeth on the ywheel ring gear (Thresholds table, parameter 24). If
zero is entered as the number of teeth for the ywheel ring gear parameter, the
control unit is congured to not have a pickup sensor and calculate the rotational
speed from the frequency generated by the genset according to the ratio
50Hz/1500rmp, 50Hz/3000rpm or 60Hz/1800rmp or 60Hz/3600rpm
(Regulations table, parameter 26).
The CEM7 control unit can be congured to produce an overspeeding alarm
(Alarms table, parameters 22 to 24) as well as a under speed alarm (Alarms
table, parameters 25 to 27) depending on the mechanical speed provided by the
pickup.
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 26
5.5 PROGRAMMED DIGITAL OUTPUTS
The CEM7 control unit has 8 specic purpose outputs (2 relay outputs, 3 power
outputs and 3 digital outputs).
The functioning of these outputs is preset but can be congured.
PREHEATING OUTPUT. (PR). POWER OUTPUT
The preheating output (PR) of the CEM7 control unit is an output connected to a
high power shortable driver (70 A) which regulates the heating process of the
engine's spark plugs during the starting process. The activation time of the
preheating output can be set (Times table, parameter 4). The preheating output
can also be used to control stopping via the excitation of engines which use this
type of stop (Regulations table, parameter 18).
ENGINE STARTING OUTPUT. (ARR). POWER OUTPUT
The engine starting output (ARR) of the CEM7 control unit is an output connected
to a high power shortable driver (70 A) which activates the starter. The engine
starting output remains active until a programmed motor running condition is
detected (Regulations table, parameters 19 to 22) for a programmable maximum
time (Times table, parameter 5).
• Control PULL/HOLD. The engine start control set in PULL/HOLD
mode uses the PC engine stop output as a PULL signal which is
activated for a xed time of 1 second during starting. Any of the
programmable outputs (SAL1, SAL2 or SAL3) can be used as a HOLD
signal (Settings table, parameters 1 to 3, value 25) which remains
active during the time the engine is running.
FUEL TRANSFER PUMP/HEATING/ELECTRONIC PROTECTION OUTPUT (BT).
RELAY OUTPUT
The fuel transfer pump/heating output (BT) of the CEM7 control unit is a relay
output that can be congured (Regulations table, parameter 4) to manage the
fuel tank relling function through the fuel transfer pump or control the engine
heating process or electronic protection output for overload or short circuit.
The fuel transfer pump/heating output (BT) congured as electronic protection is
activated when the control unit detects excessive consumption (Thresholds
table, parameters 7 and 8) and activates an overload (Alarms table, parameters
28 to 30) or short circuit alarm (Alarms table, parameters 58 to 60).
EXCITATION OUTPUT OF THE BATTERY CHARGE ALTERNATOR (D+). DIGITAL
OUTPUT
ENGINE STOP OUTPUT. (PC). POWER OUTPUT
The engine stop output (ARR) of the CEM7 control unit is an output connected to
a high power shortable driver (70 A) which activates the stopping of the engine.
The congurable engine stop output (PC) can be congured so that it controls
engines with four different stop modes (Regulations table, parameter 18):
• Stop via de-energisation. The engine stop output congured as
a stop via de-energisation is activated 500 minutes after the
preheating output has been deactivated, which occurs when the
engine stop command has been given.
• Stop by excitation. The engine stop output congured as a stop by
excitation is activated for a programmable time interval (Times table,
parameter12) the engine stop command has been given.
• Stop by excitation/de-energisation. The engine stop output congured
as a stop by excitation/de-energisation is activated 500 minutes
after the preheating output has been deactivated, and is deactivated
when the engine stop command has been given. This output is used
to enable the engine sensors, with the preheating output involved in
performing the engine stop via the process of stopping by excitation.
The D+ output of the CEM7 control unit is responsible for exciting the battery
charging alternator during the starting process. This output can be congured
(Regulations table, parameter 3) to provide a start pulse (alternator mode) for a
programmable time interval (Times table, parameter 8) or keep the alternator
continuously energized (dynamo mode).
GENSET CONTACTOR OUTPUT (CG). RELAY OUTPUT
The genset contactor output (CG) of the CEM7 control unit is a relay output that
manages the closing and opening of the contactor. The activation of the genset
contactor can be congured to be continuous or via a pulse (Times table,
parameter 29)
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 27
ALARM OUTPUT (AL). DIGITAL OUTPUT
STARTED ENGINE OUTPUT (MA). DIGITAL OUTPUT
The alarm output (AL) is responsible for communicating the different states of
the CEM7 control unit. The AL output simultaneously activates the ashing of the
Reset key LED and display module buzzer of the CEM7 control unit. This output
monitors the following states of the CEM7 control unit:
• External start of the control unit. Before starting the control unit
when commanded by a programmable input associated with AE
mode, the control unit's alarm output (AL) is activated for 5 seconds.
The activation of the alarm output (AL) due to an external start of the
control unit can be inhibited (Regulations table, parameter31).
• Control unit errors. Given an error which is active or pending
notication by the user, control unit alarm output is activated for
a maximum programmable time (Times table, parameter 14). The
errors that activate the AL output are both alarms that cause the
engine to stop and warnings that do not cause the engine to stop.
Depending on how the AL output has been programmed (Regulations
table, parameter 31, acoustic alarm eld):
For an AL outlet that has been programmed as an acoustic signal (Regulations
table, parameter 31, acoustic alarm, eld value 0), when the user presses the
RESET key:
• Continuous activation of the AL output (value 0 in Times table,
parameter 14): the AL output is disabled, providing there is no active
error or warning.
• Timed activation (value in seconds of the activation of the output in
the Times table, parameter 14): the AL output is disabled the rst
time the RESET key is pressed or once the output activation time is
exceeded.
The started engine output (MA) of the CEM7 control unit is activated when any
started engine condition is detected and remains active while the engine is
running. The started engine output (MA) is deactivated as soon as the engine
stopping process begins; said process includes the engine cooling interval
(Times table, parameter 11) during the stopping process.
ELECTRONIC PROTECTION OUTPUT (SC). DIGITAL OUTPUT
The electronic protection output (SC) is activated when any alarm that stops the
engine is detected. The output remains activated until all the alarms that cause
the engine to stop disappear and are reported.
5.6 PROGRAMMABLE OUTPUTS
The CEM7 control unit has 3 programmable outputs with operation which can be
congured to indicate certain states (Settings table, parameters 1 to 3) and a
relay output (Settings table, parameter 4). The possible congurations that are
permitted with the programmable outputs are:
INHIBITED OUTPUT
The programmable outputs congured as inhibited output do not respond to any
action or state as they are permanently disabled.
When the AL output is programmed to signal errors (Regulations table, parameter 31, acoustic alarm eld, value 1), when the user presses the RESET key, the
buzzer of the interface is disabled but the AL output activation is maintained as
long as any active genset alarm remains in effect or pending notication.
OUTPUT PROGRAMMED ACCORDING TO THE STATE OF AN INPUT
The programmable outputs (associated with a programmable input) are activated
when an associated input is detected.
Possible congurations of associated inputs include the following values:
• Fuel reserve input
• Water level input
• Programmable input 1
• Programmable input 2
• Programmable input 3
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 28
• Programmable input 4
• Programmable input 5
PROGRAMMED OUTPUT FOR ALARM
parameter 26). The programmable output congured as programmed output for
dummy load is deactivated when higher genset power consumption than the
programmed threshold is detected (Thresholds table, parameter 33) during a set
time (Times table, parameter 26). As a condition for enabling the dummy load
output, the engine must be in a stabilized state.
The programmable outputs congured as a programmed output for alarm is
activated when the control unit detects an active alarm associated to a
programmable output or has not still not been notied by the user.
PROGRAMMED OUTPUT FOR FUNCTION
The programmable outputs congured as programmed output for function are
congured to allow a functionality associated to an output already used. Possible
congurations of functions include the following values:
• Heating resistor. The output programmed to function as heating
resistor activation if the BT relay is programmed to manage the fuel
transfer pump.
PROGRAMMED OUTPUT FOR MODE
The programmable outputs congured as a programmed output for mode is
congured to indicate the mode of operation of the control unit. Possible mode
congurations include the following values:
• Control unit in manual mode.
• Control unit in auto mode.
PROGRAMMED OUTPUT FOR DUMMY LOAD
DESCRIPTION
This function allows the activation of a loading bank which is separate to the
installation load, to avoid the generator set operating with low-load, in order to
prevent excessive oil consumption in the engine and allow it to run with an
optimal load.
PROGRAMMING
The programmable outputs congured as programmed output for dummy load is
activated when lower genset power consumption than the programmed threshold
is detected (Thresholds table, parameter 32) during a set time (Times table,
NOTE
From the rmware versions of control units: Display 3.20 / Measurements 2.50
PROGRAMMED OUTPUT FOR ENGINE HOLD CONTROL MODE
DESCRIPTION
This functionality activates for one second the PC output, simultaneously with the
programmed output in HOLD mode, in engines controlled in PULL/HOLD mode
(Regulations table, parameter 18, value 3). The programmed output in HOLD
mode remains active during engine operation.
For GAS engines (Regulations table, parameter 18, value 4), this functionality
allows the activation of the gas train at the installation.
PROGRAMMING
To activate the engine's PULL/HOLD control mode, a programmable output must
be assigned to the HOLD control function (Settings table, parameters 1 to 3,
value 25).
PROGRAMMED OUTPUT FOR STARTING DUE TO LOAD DEMAND
DESCRIPTION
This functionality allows the activation of an output when the power generated by
the generator set exceeds a programmable threshold for power generated by the
genset.
PROGRAMMING
With the generator set in operation, an output programmed with the load demand
start function will be activated (Settings table, parameters 1-4) when it is
detected that power consumption exceeds a programmed parameter limit
(Thresholds table, parameter 34). The output will remain active until the genset
power consumption falls below a programmed parameter limit (Thresholds table,
parameter 35). Both with the activation and deactivation of the load demand
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 29
output, the conditions must be validated for a programmable time (Times table,
parameter 27).
NOTE
From the rmware versions of control units: Display 4.49 / Measurements 4.01
DESCRIPTION
Programmable outputs can be congured to open the genset contactor for use
with motorized thermal-magnetic circuit breakers (Settings table, parameter 1 to
4, value 27). The output can be congured so that it is activated continuously or
in a timed mode via a pulse (Times table, parameter 29).
PROGRAMMED OUTPUT FOR GENSET/NETWORK CONTACTOR STATE (ONLY CEA7)
DESCRIPTION
The programmable outputs can be congured to monitor both the genset
contactor status and the network contactor status (only CEA control unit).
WATCHDOG PROGRAMMED OUTPUT
DESCRIPTION
The programmable outputs can be congured to monitor the status of the
electronics. The output remains active if the correct operation of the generator
set's control system is veried.
STABILIZED ENGINE PROGRAMMED OUTPUT
DESCRIPTION
Programmable outputs can be congured to monitor the stabilized engine status
(Settings table, parameters 1 to 4 or 24, value 96). The output remains active
once it detects the stabilized running condition of the engine after start-up (Times
table, parameter 7) including the cooling time during the stopping cycle.
NOTE:
Activation of the genset contactor is performed with a programmable time after
detecting that the engine is in operation (Times table, parameter 6), it being
possible to dephase the activation of the genset contactor and programmed
output in STABILIZED ENGINE mode.
PROGRAMMED FUMES CONTROL OUTPUT
DESCRIPTION
Programmable outputs can be congured to initiate the engine start-up process
with fumes control. This requires assigning a programmable output (Settings
table, parameters 1 to 4, value 97) that will be enabled during the start-up
process and will remain active for a programmable length of time (Times table,
parameter 33) once the engine is running.
5.7 EXPANSION PROGRAMMABLE OUTPUTS
The CEM7 control unit has 4 additional programmable outputs installed in the
Second Zero Suppression expansion, the operation of which can be congured to
indicate certain states (Settings table, parameters 18 to 21). Of the 4 outputs
available, 2 (Programmable outputs 4 and 5) of them are directly connected at
the terminal and the other 2 (programmable outputs 6 and 7) must be requested
as a special function. The possible congurations permitted by the programmable
outputs are the same as those explained in section 5.6 Programmable outputs.
PROGRAMMED GENSET CONTACTOR OPENING OUTPUT
CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 30
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