Altronic 791950-8 - User Manual

INSTALLATION INSTRUCTIONS
CPU-95
DIGITAL IGNITION SYSTEM
MODELS 791950-8/16/18, 791952-18, 791958-16
DEVIATION FROM THESE INSTRUCTIONS MAY LEAD TO IMPROPER OP-
ERATION OF THE MACHINE WHICH COULD CAUSE PERSONAL INJURY
TO OPERATORS OR OTHER NEARBY PERSONNEL.
WARNING:
www.altronicinc.com
FORM CPU-95 II 4-08
www.altronicinc.com
1
DEVIATION FROM THESE INSTRUCTIONS MAY LEAD TO IMPROPER
ENGINE OPERATION WHICH COULD CAUSE PERSONAL INJURY TO
OPERATORS OR OTHER NEARBY PERSONNEL.
WARNING:
1.0 SYSTEM DESCRIPTION
1.1 The Altronic CPU-95, DC-powered ignition system is a microproces-
sor-based capacitor discharge system designed for application on
natural gas fueled engines. The system features crankshaft-trig-
gered timing accuracy and the capability to vary timing electroni-
cally by several means, including an external 4-20 mA control signal
connected to the optional Display Module. The system is eld-pro-
grammable and offers a variety of advanced control methods, emis-
sions reduction, primary and spark diagnostics, self diagnostics,
serial communications and engine protection features. The system
consists of two main parts: an engine mounted Ignition Module and
an optional user interface Display Module.
1.2 Various models of the Ignition Module are available:
791950-8 8-outputs, standard
791950-16 16-outputs, standard
791950-18 18-outputs, standard
791952-18 18-outputs, dual capacitor
791958-16 16-outputs, Varispark™ extended duration
1.3 The optional Display Module has a graphical, back-lit LCD display
that shows the operating status, engine RPM, energy level, single or
double-striking mode, current loop input value and ignition timing.
Additional display screens show set-up and diagnostic information.
1.4 To allow for a simple and economical upgrade of existing Altronic
CPU-90 installations, the CPU-95 utilizes the same ignition box mount-
ing layout, existing Altronic coils, magnetic pickups, Hall-effect
pickup and trigger magnet, pickup cables, primary wiring harness
and junction box(es).
1.5 Power requirement is 24 Vdc, 5 ampere nominal for typical applica-
tions. For Ignition Module 791958-16, use a supply rated for 24 Vdc, 10
amperes. SEE SECTION 9.2 FOR DETAILS.
THE IGNITION SYSTEM MUST BE CONFIGURED PRIOR TO
USE ON AN ENGINE. REFER TO SECTION 9.7 TO VIEW THE
CURRENT CONFIGURATION. REFERENCE FORM CPU-95 PI
FOR INSTRUCTIONS DESCRIBING HOW TO CONFIGURE THE
IGNITION SYSTEM. VERIFY EEPROM PROGRAMMING PRIOR
TO STARTING ENGINE.
WARNING:

Summary

System Description

System Overview

Overview of the CPU-95 DC-powered, microprocessor-based capacitor discharge ignition system.

Power Requirements

Mounting the CPU-95 Ignition Module

Ignition Module Mounting Location

Requirements for selecting a suitable mounting location for the Ignition Module on the engine.

Ignition Module Fastening

Mounting the CPU-95 Display Module

Display Module Mounting Surface

Guidance on mounting the Display Module to a control panel or flat surface, minimizing vibration.

Display Module Distance

Flywheel Gear and Hole Mounting

Flywheel Pulse Source Requirements

Lists requirements for the flywheel ring gear or drilled holes used as the angular position pulse source.

Mounting the Magnetic Pickups

Magnetic Pickup Installation

Details the requirement for two magnetic pickups and their mounting for signal efficiency.

Mounting the Flywheel Reset Pin

Reset Pin Placement

Instructions for setting the engine and marking the flywheel for reset pin installation.

Reset Pin Air Gap Adjustment

How to adjust the air gap between the reset pin and the magnetic pickup using a feeler gauge.

Mounting the Cycle Trigger

Trigger Magnet Mounting

Details mounting the trigger magnet on the camshaft or accessory drive for 4-cycle engines.

Hall-Effect Pickup Alignment

Instructions for aligning the Hall-effect pickup with the trigger magnet and reset pin.

Ignition Module Electrical Hookup

General Hookup Guidelines

Power Source Connections

Details the acceptable 24-volt battery and charger or DC power supply options for the system.

Wiring Separation

Left Conduit Entry

Display Module Electrical Hookup

General Wiring Precautions

Display Module Power

Specifies power input source and hookup for the Display Module, emphasizing ground potential.

Module Communication Wiring

Details wiring for RS-485 serial communication between the Display Module and Ignition Module.

Current Loop Input

Altronic 791950-8 Specifications

General

Brand	Altronic
Model	791950-8
Category	Engine
Language	English