Altronic VariSpark CPU-XL, Operating Instructions Manual

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CPU-XL VariSpark IOM 07-21
All rights reserved © ALTRONIC, LLC 2021
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3.0 MOUNTING THE LOGIC/DISPLAY MODULE
3.1 The CPU-XL Logic/Display Module is preferably panel-mounted off the engine in such
a manner as to minimize exposure to vibration. Refer to Figure 2 for dimensions.
3.2 The Logic/Display Module should be mounted within 50 feet (15m) of the
Junction/Diagnostic Module.
3.3 Operating temperature range is -40°F to 158°F (-40°C to 70°C). Humidity
specification is 0-95%, non-condensing. Housed in a NEMA 4 enclosure, the
CPU-XL Logic/Display Module is splash resistant; however, the mounting site
should provide as much protection from inclement weather as is practical. Avoid
mounting the LCD display and keypad in direct sunlight.
4.0 MOUNTING THE OUTPUT MODULES
4.1 Refer to Figure 3 for physical dimension details. Select a mounting location meeting
the following requirements:
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On the engine, within 50 ft. (15m) of the Logic/Display Module.
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Within 15 ft. (4.5m) of the Junction/Diagnostic Module.
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Within 6 ft. (1.8m) of the ignition rails.
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The maximum ambient temperature must not exceed 158°F (70°C).
4.2 The Output Module enclosure should be fastened securely to a rigid engine
bracket using the shock mounts provided.
5.0 MOUNTING THE JUNCTION/DIAGNOSTIC
MODULE
5.1 Refer to Figure 4 for physical dimension details. Select a mounting location
meeting the following requirements:
n
Within 20 ft. (6m) of the Output Modules.
n
The front panel door of the Junction/Diagnostic Module should be easily
accessible and free to swing open.
n
The maximum ambient temperature must not exceed 158°F (70°C).
5.2 The Junction/Diagnostic Module enclosure should be fastened securely to a rigid
engine bracket using the shock mounts provided.
6.0 MOUNTING FLYWHEEL GEAR/DRILLING FLYWHEEL
HOLES
6.1 The Altronic CPU-XL system requires a source of angular position pulses from the
engine crankshaft. This can be a flywheel ring gear, a separately provided gear or
specially drilled holes in the flywheel. The source of position pulses must meet the
following requirements:
n
Must be ferrous material, diameter of 18" or greater.
n
No. of teeth or holes must be 180 or greater.
n
Maximum run-out referenced to the pickup of .007". Refer to Figures 5
and 6 for further details.
7.0 MOUNTING THE MAGNETIC PICKUPS
7.1 The system requires two magnetic pickup signals: the angular position pulses from
the gear or drilled holes and a reset pulse near the most advanced firing position
desired for no. 1 cylinder. The pickups must be mounted to rigid brackets to
maintain an air gap of .015" ± .005" with respect to the rotating gear or flywheel. It
is also important for maximum signal efficiency that the centerline of the rotating
part pass through the center of the pickup. See Figure 5.