Haltech E6K - Manual (Page 135)

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of the signal will vary with the speed at which the ferrous metal passes the pole piece. At low
speeds the signal may only be several hundred millivolts, but at high speeds it could rise to 20
volts or more. The sudden drop in the signal from positive to negative seen in figure E.5a
corresponds to the metal being directly in line with the sensor. As can be seen, the signal is
not a square wave required by the E6K, and at low speeds the signal amplitude is too low.
The voltage input of the reluctor adapter must first go to a positive peak, which arms the
circuit. When the signal rises to approximately 70 - 80% of the peak value the reluctor adapter
will generate a falling edge, and when the signal crosses zero volts a rising edge triggers the
Haltech ECU. If the wires are reversed and the signal goes negative first, the Reluctor adapter
will generate a pulse but it will NOT trigger the E6K correctly resulting in incorrect ignition
timing.
WARNING:
AN INCORRECTLY WIRED RELUCTOR WILL RETARD IGNITION
TIMING AS RPM INCREASES OR GENERATE MULTIPLE
TRIGGERS. INCORRECT WIRING OF A RELUCTOR TRIGGER
CAN CAUSE MAJOR PROBLEMS. IF YOU ARE USING A
RELUCTOR PICKUP ENSURE THAT THEY ARE WIRED WITH THE
CORRECT POLARITY.
E.2.1 E6K Internal Reluctor Adaptor
Normal configuration of the E6K is for a Hall Effect input. To configure the E6K for a
reluctor type pickup it is necessary to change the Trigger Input on the Ignition Set-up page to
Int. Reluctor. This tells the E6K to use the internal reluctor adaptor to convert the trigger input
into a square wave for processing. When this is selected, the Trigger Gain may be adjusted in
the line below the Trigger Input. This gain is used to adjust the electronics inside the E6K to
provide the best conversion of the reluctor input signal. Different types of reluctor sensors
will provide different levels of signal amplitude and this software adjustable gain is designed
to allow the user to adjust the sensitivity of the Reluctor Adaptor. Start with a smaller gain
and increase the value until the Reluctor Adaptor is reading Engine RPM correctly. When the
desired level is achieved the Internal Reluctor Adaptor is now fully configured and ready to
convert reluctor signals for processing.
Following is a diagram showing the trigger input into the internal reluctor adaptor and the
square wave output it provides for processing.
+ V
GND Input Trigger Signal
- V TRIGGER POINT IS RISING EDGE
ZERO VOLT CROSSING
+5-12V
Output Trigger Signal
GND
Figure E.5. Top diagram is the signal from the magnetic reluctor sensor. Bottom diagram is the signal
after modification by the on-board Reluctor Adapter circuit.