Installation of the Ignition Sensor Unit (ISU)

The ignition sensor unit is installed on a DIN rail on the engine in direct proximity to the ignition coil of the first cylinder in the firing order, which is equipped with a detonation sensor or in the vicinity of the ignition controller.

For information on wiring connections, please refer to section Wiring of the Ignition Sensor Unit (ISU).

For diesel and pilot injection engines, a camshaft sensor is used instead of an ignition sensor unit (ISU). Refer to the section Installation of the Camshaft Sensor. No ignition sensor unit is needed when using a MOTORTECH ignition controller with ASO output (e.g. MIC4) either. You can find information in the section Wiring for Ignition Controller with ASO Output.

 

Installation on the engine

The ignition sensor unit is fully sealed and therefore resistant to vibrations. When installation on the engine or in an environment in which vibrations arise, only the connector has to be secured e.g. by means of a cable tie.

20_Zuendimpulssensor_Stecker_sichern

Please note that the contacts of the connector are bare and have to be protected against moisture and pollution. If the engine should be in such a location, the ignition sensor unit can be installed, for example, in a junction box or housed in a control cabinet.

   

No ignition sensor unit is required for the ASO output

If you use a MOTORTECH ignition controller (e.g. MIC4) with auxiliary synchronization output (ASO), you do not need any ignition sensor unit (ISU). In this case, the ignition pulse is transmitted to the DetCon via the ASO output.

   

Overview of use: ignition sensor unit and Load Resistance jumper

The following table provides an overview of the applications for which you have to use the ignition sensor unit (ISU) and when the jumper Load Resistance on the DetCon device has to be removed:

 

Pilot injection or diesel engine

Gas engines

Without ASO output (e.g. MIC500)

With ASO output (e.g. MIC850, MIC4)

Ignition sen-
sor unit (ISU) required

No

Yes

No

Jumper Load Resistance

Remove jumper

Jumper set

Remove jumper