Haltech E6X Manual Win Version - Manual (Page 154)

E6X Manual
154
E.1.3 Haltech Hall Effect Sensors
The Haltech Hall Effect sensor is a two-channel device that can be used to trigger the Haltech
range of ECU’s in a wide range of applications. As the Haltech Hall Effect sensor is dual
channel, it can provide this synchronisation pulse as well as the trigger signal.
The principle behind its operation is quite simple. As a magnet passes the sensor, the output
state of the sensor, changes from high to low. The position of the magnets determines the
output signals from the sensor.
The S3 Hall effect Sensor
The S3 sensor which is identified by a black cable gland, operates in the following way:
As a south pole passes the sensor face the signal in both the primary (PIN C) and secondary
(PIN D) channels are switched to a low state. As a north pole passes the sensor a low state
will only occur on the primary channel.
Note: magnets should always be mounted in a non ferrous material such as
aluminium, stainless steel or titanium.
Many installers have successfully mounted the rare earth magnets in non-ferrous surrounds
such as modified aluminium and stainless steel bolts, and installed the bolts into ferrous
material.
With these characteristics a direct fire can be set up in the following way:
Using the sensor on the crank
After a suitable mounting location for the sensor has been found the engine should be
positioned at approximately 75
° BTDC on cylinder no.1 compression. The magnet should
now be placed in the aluminium disk with the South Pole facing towards the sensor, making
sure the magnet is in line with the sensor when the engine is in this position. This is now the
reference point for all the other magnets. The number of cylinders will determine the number
of magnets required and the angle of installation. The remainder of the magnets to be fitted
will all have a north pole facing the sensor.
The adjustment of the air gap will be determined by the strength of the magnets used. This
should be tested once the wheel assembly has been installed. Checking the Engine Data page
for steady RPM is usually a good indication that the airgap is acceptable.