MSS3s Machine Security System Caterpillar

The locations of the components of the MSS will vary between machines. If the MSS was installed by a Caterpillar dealer, consult the installation instructions for component locations. If the MSS was an attachment that was installed at the factory, consult the electrical schematic for that machine.

For each output use a twisted wire pair, all the way between the MSS3s ECM and the load (recommended).

Note: There is a need to manage shared returns, connecting the returns together as close to the ECM as possible. Failure to do so may result in difficulty reading keys due to electromagnetic interference.

• The 2A drivers share a separate return.

• The 300mA drivers share a separate return.

• The 20mA LED drivers share a separate return.

• The exciter coil has a dedicated return that is not to be shared.

Use the Machine Electrical Schematic, Parts Manual, and Operation and Maintenance Manual to locate electrical components and connectors.

The following information is a guide to reading the tables on the back of the Electrical Schematic.

• The "Component Location" table uses a numeric value for each component on the machine. Cross reference the machine location number from the table to the corresponding number in the machine views graphic.

• The "Harness Connector Location" table uses a numeric value for each connector on the machine. Cross reference the connector number from the table to the corresponding number in the machine views graphic.