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D-500 MK2 User Manual
34.16. FUEL PUMP CONTROL
The unit is able to provide a digital output function in order to drive the fuel pump motor.
The fuel pump is used to transfer fuel from the large capacity main tank (if exists), to the genset daily tank
which is generally integrated in the chassis and has a limited capacity.
The fuel level reference is measured through the analog fuel level sender. When the measured fuel level
falls below Fuel Pump Low Limit parameter, the fuel pump output function will become active. When the
fuel level reaches Fuel Pump High Limit parameter, the output function will become passive. Thus the
chassis fuel tank level will be always kept between Fuel Pump Low Limit and Fuel Pump High Limit
parameters.
If the Fuel Pump High Limit is not reached within Fuel Filling Timer duration, then the fuel pump will
stop for safety.
The fuel pump relay function may be assigned to any digital output using Relay Definition program
parameters.
34.17. GAS ENGINE FUEL SOLENOID CONTROL
The unit provides a special function for the fuel solenoid control of a gas engine.
The fuel solenoid of a gas engine is different from a diesel engine. It should be opened after the cranking
has been started and should be closed between crank cycles. The delay between the crank start and
solenoid opening is adjusted using the Gas Solenoid Delay program parameter.
The gas engine fuel solenoid relay function may be assigned to any digital output using Relay Definition
program parameters.
34.18. PRE-TRANSFER SIGNAL
The controller is able to provide a pre-transfer digital output function.
This function is designed for elevator systems, in order to bring the cabin to a floor and open cabin doors
before transfer.
The duration where this output is active is adjusted with the Pre-Transfer Delay parameter.
If the Pre-transfer Delay parameter is not zero, this will delay
transfers by the same amount.
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Firmware V-6.3
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