11 Commissioning
PHLOX - Ignition Control System 79
Configure pick-up signal output according to pick-up specification:
Par. 4023 = 0 for Heinzmann standard pick-up signal output (signal low when pick-up
over tooth, high when pick-up over gap)
Par. 4023 = 1 for inverted pick-up signal output (signal high when pick-up over tooth,
low when pick-up over gap)
Configure trigger edge for best timing:
Depending on the pick-up used, the falling or the rising edge shall be the better choice for
best ignition timing
Par. 4024 = 0 for Heinzmann standard trigger edge (begin of tooth / gap)
Par. 4024 = 1 for inverted trigger flank (end of tooth / gap)
ï‚· Inductive crankshaft pick-up setup
This paragraph concerns only inductive pick-ups
For inductive pick-ups, the trigger level is speed-dependent and can be setup with the help of a
curve (Par. 7700-7704, 7710-7714 or via the menu Graphics->Curve->Trigger-Level Inductive
Pick-Up 1). It is important to set this curve up properly according to the pick-up and measuring
wheel properties, otherwise speed measuring and timing problems may occur. As a starting point
following curve may be used:
This curve needs to be corrected if speed measuring or timing problems occur. If this is
case it is recommended that you measure the pick-voltage of the pick-up signal output at
different speeds and to setup the trigger-levels for those speeds at half of the measured
voltage. Generally, it is good practice as soon as speed increases to depart from the very
low trigger levels (like 50 or 100mV), which make speed sensing quite sensitive to signal
disturbances.
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