D-500L Firmware V-5.8
K35D03-EN - 127 -
Especially on engines without a body heater, or with a failing one, it may be desired that the genset
should not take the load before reaching a suitable temperature. The unit offers 2 different ways of engine
heating.
1. Timer controlled heating:
This operation mode is selected when the Engine Heating Method parameter is set to 0. In this mode,
the engine will run during parameter Engine Heating Timer, and then the genset will take the load.
2. Timer and temperature controlled heating:
This operation mode is selected when the Engine Heating Method parameter is set to 1. In this mode, at
first the engine will run during parameter Engine Heating Timer, then it will continue to run until the
measured coolant temperature reaches the limit defined in parameter Engine Heating Temperature.
When the requested temperature is reached, the load will be transferred to the genset. This operation
mode may be used as a backup to the engine body heater. If the engine body is warm the heating will be
skipped.
It may be required that the engine runs at the idle speed for a programmed duration for engine heating.
The idle operation duration is adjusted with the parameter Idle Speed Timer. The idle speed will be set
by the governor control unit of the engine.
Any digital output may be assigned as IDLE output using Relay Definition program parameters.
The Idle speed operation is performed both in engine start-up and cool-down sequences. Low speed and
low voltage protections are disabled during idle speed operation.
The unit is able to provide a digital output in order to drive the block heater resistor. The temperature
reference is the coolant temperature measured from the analog sender input.
The block heater output function may be assigned to any digital output using Relay Definition program
parameters.
The engine body temperature limit is adjusted using the parameter Engine Heating Temperature. The
same parameter is used for engine heating operation.
The relay will become active if the body temperature falls to 4 degrees below the limit set by Engine
Heating Temperature. It turns off when the body temperature exceeds Engine Heating Temperature.
26.15. ENGINE BLOCK HEATER
26.14. ENGINE IDLE SPEED OPERATİON
26.13. ENGINE HEATING OPERATION
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