Before you can operate the machine, the MSS must identify a valid electronic key ID. The MSS identifies a valid electronic key ID via the exciter coil.
Exciter Coil
When the key is turned to the ON position, the MSS enters the read mode. The MSS then checks for a valid electronic key ID. If the electronic key ID matches one stored in the MSS3s ECM, then power is supplied to the output drivers of the MSS3s ECM. An "enable" message is also sent via the CAT data link to the other electronic control modules that are on the machine. The machine will operate normally.
Note: Ensure that you have only one electronic key near the exciter coil when the MSS reads the key. If more than one electronic key is near the exciter coil, the MSS3s ECM will not be able to read the key. If the MSS3s ECM cannot read the key, the machine will not start.
Note: If the MSS3s ECM has failed or been removed, the other critical machine operations controlled by the other electronic control modules will not operate.
After a machine has been started successfully, the operator will have 30 seconds after the machine is turned off before the MSS is automatically armed. The operator is not required to arm the system manually.
If the MSS is unable to read an electronic key ID, the system will remain armed.
When the MSS identifies a key with an invalid electronic key ID, the system will remain armed.
When the MSS is armed, the output drivers are open. The output drivers being open, disables the power that is supplied to each component that is powered by the output drivers. The machine will not be able to operate normally. When the system has been armed, the red LED of the status indicator will illuminate.
There are two states of operation within the "armed" mode.
- "MSS Armed"
When no power is applied to the MSS, the MSS will default to "armed" state. When power is applied to the MSS, and all timeouts have expired, the MSS will return to the "MSS Armed".
- "MSS Read"
Exciter Coil
When the keyswitch is first moved to the ON position, the MSS tries to read the electronic key ID. The ECM will continue reading attempts until an ID is read or the read timeout expires. If an ID is read, the MSS changes to the "MSS read" state. If the read timeout expires, the MSS will turn on the red LED of the status indicator and the MSS will remain armed.
Note: Ensure that you have only one electronic key near the exciter coil when the MSS reads the key. If more than one electronic key is near the exciter coil, the MSS3s ECM will not be able to read the key. If the MSS3s ECM cannot read the key, the machine will not start.
When the MSS is disarmed, the machine can be operated. The MSS has enabled the starter and main circuits on the machine. A message is sent to the other machine ECMs over the J1939 and Cat data links. The machine will be able to start. The green LED of the status indicator will illuminate.
There are two ways to disarm the machine:
- Use a valid electronic key for this machine.
- Use the Cat Electronic Technician with a "Master Access Level" key or a factory password to modify the configuration of the system.