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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8.0 MOUNTING THE FLYWHEEL RESET PIN
8.1 Set the engine with no. 1 cylinder six (6) degrees ahead of the most advanced
firing point. Mark a point on the flywheel directly opposite the pole piece of the
reset magnetic pickup; then rotate the engine to a position convenient for drilling
and tapping the flywheel at the point marked above. The reset pin should be
made from a steel (magnetic) 1/4"-20 bolt or stud. See Figure 5.
8.2 Rotate the engine to the original set point and adjust the air gap between the end
of the reset pin and the magnetic pickup at .010" using a feeler gauge.
9.0 MOUNTING THE CYCLE TRIGGER
(4-cycle engine only)
9.1 The trigger magnet (260604, 260605 or 720002) must be mounted on the engine
camshaft or other accessory drive operating at camshaft speed. An M8 (8mm)
tapped hole, 0.5 inches (13mm) deep is required. See Figures 7, 8 or 9 for details.
The magnet MUST rotate on a diameter NOT EXCEEDING:
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6 inches (152mm) for magnet 720002, or
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15 inches (381mm) for magnet 260604 or 260605.
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Maximum run-out referenced to the pickup of .007”
9.2 Set the engine on the COMPRESSION stroke of no. 1 cylinder with the reset pin
DIRECTLY OPPOSITE the reset pickup. The Hall-effect pickup (591014-x) must
be mounted DIRECTLY OPPOSITE the trigger magnet coincident with the reset
pickup and pin being lined-up.
10.0 LOGIC/DISPLAY MODULE ELECTRICAL HOOK-UP
10.1 The power connections to the CPU-XL must be in accordance with the National
Electrical Code or other applicable country code. The CPU-XL is suitable for
installation in Class I, Division 2, Group D locations.
10.2 The Logic/Display Module must have its own 24Vdc power connection. Although
the device has internal protective fuses (3 amp), an external fuse near the power
source is recommended.
10.3 Power wiring and signal wiring must be in separate conduits and conduit entries into the
Logic/Display Module to avoid undesired electrical interaction. All conduit entries are
sized for a 1/2"-14 NPT male conduit fittin g. Separate as follows (refer to Figure 11):
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RIGHT CONDUIT ENTRY Power wiring and cable 293030-xx to
Diagnostic Module
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CENTER CONDUIT ENTRY Magnetic pickups and Hall-effect pickup
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LEFT CONDUIT ENTRY Control inputs, serial communications, and
alarm outputs
10.4 RIGHT ENTRY: Input power supply wires (16 AWG minimum) should enter the
right conduit entry and connect to the 24Vdc supply terminals of the terminal
block. The interface cable 293030-xx, connecting the Logic/Display Module with
the Junction/Diagnostic Module, also enters through the right conduit entry. Refer
to Figures 11 and 12 for connection details.
10.5 CENTER ENTRY: Run a separate conduit for the two (2) magnetic pickup cable
assemblies. These should enter through the center entry in the Logic/Display
Module box and terminate as shown in Figure 11.
4-CYCLE ENGINE ONLY: The cable from the Hall-effect pickup also enters
through the center entry and connects as shown.
10.6 LEFT ENTRY: A separate conduit must be used to the left-hand entry for all
connections to the user interface terminal strips in the Logic/Display Module. Use
24 AWG, UL style 1015 wire or shielded cable for these connections; the 24 AWG
wire is available from Altronic under part no. 603102 (black) or 603103 (white).
A. SHUTDOWN INPUT (terminal 4): Use to stop the ignition for engine shutdown.
This input is open for normal operation of the system and is connected to
engine ground to inhibit ignition firings. NOTE: This is a 5-volt low level signal.
NOTE: The Hall-effect signal and
the reset pickup signal must occur
at the same time for the system to
function.
The Hall-effect pickup dimensions
are shown in Figure 10. The air gap
between the Hall-effect pickup and
trigger magnet must not exceed
.040" (1.0mm).