Section 75 00-02-0878
2013-03-07 - 65 -
Idle Running
The purpose of the idle run function is to change the start and stop sequences to allow
the genset to operate under low temperature conditions.
It is possible to use the idle run function with or without timers. Two timers are
available. One timer is used in the start sequence, and one timer is used in the stop
sequence.
The mains purpose of the function is to prevent the genset from stopping. The timers
are available to make the function flexible.
NOTE: The speed governor must be prepared for the idle run
function if this function is to be used.
The function is typically used in installations where the genset is exposed to low
temperatures which could generate starting problems or damage the genset.
Description
The function is enabled and configured in parameters 6290–6295 Idle running. It has to
be noted that the governor itself must handle the idle speed based on a digital signal
from the unit (see the principle diagram below).
When the function is enabled, two digital inputs are used for control purposes:
This input is used to change between idle speed and nominal speed. This input
does not prevent the genset from stopping - it is only a selection between idle and
nominal speed or ratio speed.
control input
When this input is activated, the genset will start. It will not be able to stop as long
as this input is activated.
NOTE: If the idle run function is selected by means of the timer, the
low speed input is overruled.
NOTE: The input must be configured through the PC software
(USW) at commissioning.
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