KMS MA-5 manual
Version 5.1
16
3.4.1.2
RPM limiters and PowerShift
Standard Limiters
This menu can be used to set various speed
limiters and Power Shift.
The standard limiters include a soft and a
hard limiter. The soft limiter stops ignition
partially so that power is lost. The hard limiter
switches off ignition completely.
For the KMS MA5 management system the
maximum rpm limiter is 20.000 rpm *
*: with a 60-2 crank trigger pattern the
maximum engine speed is limited to 12.500
rpm.
Launch Limit RPM on button
At launch limit an extra limiter (start line) can
be set which is activated, for instance, by a
button that connects pin 19 to the ground.
Depending on the type of button, NC
(normally closed) or NO (normally open),
'Input NC' will have to be ticked or not. If the
NO type is used (recommended) do not tick
the box. There is also the possibility to set an
extra launch limiter which makes it possible
to make the launch limiter variable between
these two rpm’s by connecting a
potentiometer signal to the analog aux input,
which can be configured for this function, see
. The potentiometer
must have a range between 1
kΩ and 47 kΩ.
The 5V and ground for the potentiometer are
available from the
5V/ground sensor supply. The signal of the
potentiometer must be connected to the Analog Aux 1.
Advanced settings:
This can be used to build up boost pressure before start. 'Advanced settings' gives the possibility of
setting a fixed ignition moment (between 54 degrees before and 54 degrees after TDC. After TDC is
indicated by a negative number), fixed fuel enrichment and fixed PWM boost for several ascending
engine speeds. This enables a high boost pressure to be built up in turbocharged engines without
further increasing the engine speed. Additional fuel enrichment can be set when launch control is
activated, this is needed to cool the engine. During activation lambda-control is switched off. Should
the engine speed increase in spite of ‘ignition retard’, the startline limiter will intervene by stopping
ignition and injection. The boost pressure can also be limited during launch by setting the duty-cycle
(PWM-value) of the boost control-solenoid.
