Himoinsa CEM7 - Page 17

OPERATION | PAGE 17
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 MenuParametersSensors.
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.
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 + CEC7).