Woodward IC-920 Ignition Controller Unit

Module Feature

IC-920 is a capacitive discharge ignition controller developed by Woodward for industrial spark ignition gas engines.

It provides adjustable ignition energy up to 170mJ, supports independent timing setting for each cylinder, compatible with 20-coil configuration (24-coil optional). The timing precision reaches ±0.17° crank angle at rated speed. Built-in overspeed shutdown, misfire detection and ignition circuit fault diagnosis. It adopts RS232 ServLink communication for parameter upload/download and fault record reading. It is certified for Class I Div 2 hazardous area. This model is discontinued, widely stocked as maintenance spare for gas generator, gas compressor and landfill gas engine control cabinet.

Working principle

The module receives crankshaft position and speed signal from magnetic pickup sensor.

The internal logic calculates ignition timing for each cylinder and sends trigger pulse to discharge circuit. The capacitor discharges rapidly to ignition coil to generate high voltage spark. The controller continuously monitors coil current, sensor signal and engine speed. When misfire, overspeed or circuit fault is detected, it stops ignition output and triggers engine shutdown, meanwhile uploading alarm data via ServLink serial port.

Onboard components

Main control CPU, charge & discharge power circuit, signal conditioning board, speed input interface, ignition drive output channels, RS232 ServLink transceiver, fault detection circuit, status LED array, terminal block and coated PCB.

LED indicators

LED indicators show Power, Trigger, Fault and Shutdown status.

Hardware self‑diagnosis

Built-in supervision detects pickup sensor loss, ignition coil short/open, charging circuit failure, overspeed and communication abnormality. Configuration and fault diagnosis are completed by Woodward ServLink service software.

Programming softwareServLink software, used for cylinder timing curve setting, ignition energy adjustment, overspeed threshold configuration and fault log export.

Electrical & Process Parameters

Model:IC-920 Brand:Woodward Device type:Gas engine capacitive discharge ignition controller Function:Multi-cylinder ignition timing control and engine safety protection for gas engine

Mechanical & Structure

Mounting:Engine control cabinet panel / rack installation Protection class:IP20 Housing:Flame retardant metal enclosure

Environmental

Operating temperature:-40℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, CSA Class I Div 2 Status:Discontinued original Woodward engine control spare

Installation

Cut off 24V DC control supply before replacement. Match magnetic pickup sensor wiring, verify ignition coil wiring sequence, download timing map, test ignition firing, overspeed trip and misfire diagnosis function after commissioning.

Interface

24V DC power terminal, crank pickup sensor terminal, ignition coil drive terminals, RS232 ServLink communication port, alarm/shutdown relay contacts.

Diagnostic

No spark output: Sensor missing trigger signal, charging circuit failure, parameter lock. Misfire alarm: Coil breakdown, poor high-voltage connection, timing offset. Overspeed shutdown: Speed setting too high, sensor signal interference. Communication offline: RS232 wiring reversed, baud rate mismatch.

Product BriefIC-920 controller, Woodward 170mJ capacitive discharge ignition spare for gas generator and gas compressor engine control cabinet replacement.