DKG-307 User Manual V-37 (01.03.2012)
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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 of the spare relay outputs may be assigned as IDLE output using Relay Definition
program parameters. Also relays on an extension module may be assigned to this function.
The Idle speed operation is performed both in engine start-up and cool-down sequences.
Speed and voltage protections are disabled during idle speed operation.
The unit is able to provide a relay output in order to drive the block heater resistor. The
temperature reference is the coolant temperature measured from the the analog sender input.
The block heater relay function may be assigned to spare relays using Relay Definition
program parameters. Also relays on an extension module may be assigned to this function.
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.
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