Himoinsa CEM7 - Page 26

CEM7 CONTROL UNIT INPUTS AND OUTPUTS | PAGE 26
OIL PRESSURE INPUT (P)
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.
The analogue input P can be congured to operate as a digital input (Regulations
table, parameter 35, value 1 or 2).
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.
The analogue input T can be congured to operate as a digital input (Regulations
table, parameter 36, value 1 or 2).
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
congured 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.